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CBSE Questions for Class 11 Medical Biology Locomotion And Movement Quiz 4 - MCQExams.com
CBSE
Class 11 Medical Biology
Locomotion And Movement
Quiz 4
Digestive system has ............. muscles.
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Voluntary
0%
Involuntary
0%
Cardiac
0%
All of the above
Explanation
The large, hollow organs of the digestive tract contain a layer of involuntary muscle that enables their walls to move. The movement of organ walls can propel food and liquid through the system and also can mix the contents within each organ. Food moves from one organ to the next through muscle action called peristalsis (involuntary muscle movement of the Digestive system).
Involuntary muscle is a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels.
So, the correct answer is 'Involuntary'.
The muscles involved in the movement of the arm are
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Unstriped
0%
Striped
0%
Cardiac
0%
Smooth
Explanation
When viewed under a microscope, skeletal muscle tissue has a striped or striated appearance. Hence, these are also known as striped or striated muscles.
Striated muscle or skeletal muscle is the most common and widely distributed muscle tissue in the body.
It forms all the skeletal muscles, such as the biceps. Striated muscle is a voluntary muscle. All conscious movements of the body, including the movement of the arm, legs, facial expressions, eye movements, and swallowing, are the result of the skeletal or striated muscle tissue.
So the correct answer is option B.
Strongest cartilage is
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Hyaline cartilage
0%
Fibrous cartilage
0%
Elastic cartilage
0%
None of the above
Explanation
Fibrous cartilage is the strongest kind of cartilage, because it has alternating layers of hyaline cartilage matrix and thick layers of dense collagen fibres oriented in the direction of functional stresses. This type of cartilage does not have a perichondrium as it is usually a transitional layer between hyaline cartilage and tendon or ligament. Thus, option B is correct.
Striped muscle fibre has
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Many nuclei
0%
Two nuclei
0%
No nuclei
0%
One nucleus
Explanation
Striated muscle are skeletal muscle cells like muscle fibers. These are elongated or tubular and they have multiple nuclei which are located on the periphery of the cell
So, the correct answer is '
Many nuclei'
Which of the following has involuntary muscles?
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Legs
0%
Arms
0%
Neck
0%
Intestine
Explanation
Involuntary muscle is a muscle that contracts without conscious control and is found in walls of internal organs such as the stomach and intestine and bladder and blood vessels.
Smooth muscle and cardiac muscle are involuntary. Smooth muscle is found in the walls of the intestines, stomach, oesophagus, and other organs. It contracts slowly and rhythmically to push food through the digestive system.
Legs, Arms and Neck all have skeletal muscles. These muscles are the voluntary types of muscles.
So, the correct answer is 'Intestine'.
Which of the following ions are necessary in the chemical events of the muscle contraction?
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Sodium and Potassium
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Sodium and Magnesium
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Calcium and Magnesium
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None of these
Explanation
For the contraction of muscles, a stimulus is required.
Impulse is generated when an action potential is initiated. The muscles then shorten in length and trigger the sarcoplasmic reticulum to release calcium ions into the interior of the muscle and they bind to troponin, thus causing tropomyosin to shift from the face of actin filaments, to which the myosin head need to bind to produce a contraction. Thus, Calcium plays important role in muscle contraction. Magnesium plays important role in regulation.
So, the correct answer is option C
.
Microfilaments are composed mainly of a protein called
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0%
Actin
0%
Tubulin
0%
Myosin
0%
Chitin
Explanation
Microfilaments are ultramicroscopic, long, thin, cylindrical rods of protein filaments of about 6 nm diameter.
They are composed of mainly the actin protein and have a contractile association with filamentous protein, myosin which is essential for the contraction of microfilaments.
Therefore, the correct answer is option A.
The disease that affects the joints is ______________.
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Arthritis
0%
Fracture
0%
Malaria
0%
Tetanus
At which parts of our body can we bend?
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Knee
0%
Elbow
0%
Neck
0%
All of the above
Explanation
The knee is one of the largest and most complex joints in the body. The knee joins the thigh bone (femur) to the shin bone (tibia). The smaller bone that runs alongside the tibia (fibula) and the kneecap (patella) are the other bones that make the knee joint.
The elbow joint is the synovial hinge joint between the humerus in the upper arm and the radius and ulna in the forearm which allows the hand to be moved towards and away from the body.
The neck is the part of the body that distinguishes the head from the torso or trunk.
Which part of our body has a pivotal joint?
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Shoulder
0%
Knees
0%
Ribs
0%
Neck
Explanation
Pivotal joints are freely movable joints.
They allow free movement about a single axis.
This movement is usually rotary.
As a result of the pivot joint, our face can move about freely over the neck.
So, option D is the correct answer.
Which of the following acts as a shock absorber to cushion the tibia and the femur where they come together?
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Cartilage
0%
Ligament
0%
Tendon
0%
Disc
Explanation
Answer is option A i.e. "Cartilage"
Cartilage is a vertebrate skeletal connective tissue. It is an amorphous matrix and contains glycoproteins, basophilic chondroitin and fine collagen fibres.
Between tibia and femur, cartilage helps as shock absorber, it works to help the knee move smoothly. Cartilage helps in bone to bone ligation. Cartilage is a flexible connective tissue found in many parts of the body.
The type of joint between sternum and the ribs in humans is__________________.
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Cartilagenous joint
0%
Fibrous joint
0%
Synovial joint
0%
None of the above
Explanation
Answer is option A i.e. "Cartilagenous joint"
The joint between the first rib and the sternum is cartilaginous. It is also called as sternocostal joint. These joints allow a very small amount of movement.
The bones of fibrous joints are joined by fibrous tissue, e.g. sutures in the skull or the pelvis. Fibrous joints allow no movement at all.
The bones of synovial joints meet in a joint capsule, e.g. the knee joint where the femur and tibia meet. These joints are the most common and most moveable joints in the human body.
Myoglobin is found in:
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White fibres
0%
Red fibres
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Can be traced in both
0%
Cardiac muscles only
Explanation
Myoglobin is found in red fibers.
Myoglobin contains a heme (prosthetic) group which is responsible for its main function of carrying the oxygen molecules to muscle tissues. Myoglobin can exist in the oxygen-free form, deoxymyoglobin, or in a form in which the oxygen molecule is bound, called oxymyoglobin.
Myoglobin is an iron and oxygen-binding protein found in the muscle tissue of vertebrates for eg. mammals. It is related to hemoglobin, which is the iron and oxygen-binding protein in the blood, specifically in the red blood cells. In humans, myoglobin is only found in the bloodstream after muscle injury.
So, the correct answer is '
Red fibers'.
Which of the following muscle types cannot be used voluntarily?
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Both striated and smooth
0%
Both cardiac and striated
0%
Both smooth and cardiac
0%
Cardiac, striated and smooth
Which part of the skeleton is present in the given figure?
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Cartilage
0%
Soft bones
0%
Fixed joints
0%
None of the above
Explanation
The outer ear is the most external portion of the ear. The outer ear includes the fleshy visible outer ear, called as the pinna or auricle, the ear canal, and the outer layer of the tympanic membrane, also known as the eardrum. The outer ear is the only visible portion of the ear in humans and almost all vertebrates, and consequently, the word "ear" may be used to refer to the pinna alone. The auricle consists of the curving outer rim (the helix), the inner curved rim (the antihelix), and opens into the ear canal, properly called as the external acoustic meatus. The tragus protrudes and partially obscures the ear canal. The ear canal stretches for a distance of about 1 inch and consists of an inner portion surrounded by bone, and an outer portion surrounded by cartilage. The skin surrounding the external acoustic meatus contains glands that produce ear wax (cerumen). The ear canal ends at the external surface of the ear drum (tympanic membrane). So, the given figure is outer ear and is made of cartilage and not soft bones or fixed joints.
Therefore, the correct answer is option A.
Which of the following disease is not prevented by vaccines ?
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Hepatitis
0%
Cholera
0%
Osteoporosis
0%
Small pox
Explanation
Several diseases including cholera, tuberculosis, small pox and hepatitis can be prevented by vaccination. There is no vaccine available for osteoporosis. Osteoporosis is an age related problem in which bones becomes very weak due to which even due to sudden or slight jerk leads to bone fracture.
Joints showing almost no or little movement are known as _______________.
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Immovable joints
0%
Freely movable
0%
Slightly movable
0%
None of the above
Explanation
An immovable joint is a place in the body where two bones are joined together but where little or no movement is normally possible and where no joint cavity exists. e.g. skull.
Which of the following is an immovable joint?
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Joint in the arm
0%
Joints between teeth
0%
Joint between vertebrae
0%
All of the above
Explanation
There are several examples of these joints in the human body, including joints between the bones of the skull, joints in the pelvis and joints between the teeth and the mandible, or lower jaw, and the maxilla, or upper jaw. Another name for immovable joins is a synarthrosis, which simply means immovable. The two types of immovable joints are fibrous joints and cartilaginous joints.
Therefore, (b) is the correct answer.
Excessive movement of slightly movable joint will cause damage to ____________.
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Legs
0%
Spinal cord
0%
Pelvis
0%
None of these
Explanation
In slightly movable joint the joint between two vertebrae a small amount of movement is permitted, and indeed necessary between the bones, but excessive movement would cause damage to a critical area of the body (the spinal cord). Therefore, (b) is the correct answer.
Which of the following are skeletal disorders?
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0%
Osteoporosis
0%
Arthritis
0%
Diabetes
0%
Both (B) and (A)
Explanation
Arthritis is a disorder of the joints. It involves inflammation of one or more joints. When affected by arthritis, the joint or joints affected may be painful to move, may move in unusual directions or may be immobile completely. Osteoporosis is a disease of bone where there is reduced bone mineral density, increasing the likelihood of fractures.
So, the correct answer is 'Both (B) and (A)'.
Muscle cells contain _________ protein.
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0%
Casein
0%
Actin
0%
Myosin
0%
Both B and C
Explanation
Muscle is a soft tissue found in most animals. Muscle cells contain protein filaments of actin and myosin that slide past one another, producing a contraction that changes both the length and the shape of the cell. Therefore, (d) is the correct answer.
Which of the following is the most complex joint?
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Freely movable
0%
Immovable
0%
Partially movable
0%
All of the above
Explanation
Freely movable joints are the most complex of the joints. Freely movable joints come in different shapes and allow different movements. Six types of freely movable joints exist. The ball-and-socket joint, of which the shoulder is an example, has a ball-shaped head and allows the widest range of motion. The elbow is a hinge joint and is able to move in only one plane etc. Therefore, (a) is the correct answer.
Which joint joins the bones with a joint capsule?
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Immovable joint
0%
Slightly movable joint
0%
Synovial joint
0%
None of the above
Explanation
A synovial joint joins bones with a fibrous joint capsule that is continuous with the periosteum of the joined bones, constitutes the outer boundary of a synovial cavity, and surrounds the bones' articulating surfaces. The synovial (or joint) cavity is filled with synovial fluid. They are the most common and most movable type of joint in the body of a mammal.
Therefore, (c) is the correct answer.
Slightly movable joints have a cushion of ___________ between them.
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0%
Matrix
0%
Connective tissue
0%
Plasma cells
0%
Cartilage
Explanation
Slightly moveable joint are joints which have an only limited range of movement and this is due to either fibrous tissue or cartilage. Some examples on where you can find them are: - Between the vertebrae of the spinal cord. Cartilaginous, or slightly movable joints, have a cushion of cartilage in between the bones, with the bones resting on these beds of cartilage. This cushion of cartilage stops the bones from rubbing together.
Therefore, (d) is the correct answer.
Which type of muscle is found in heart?
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0%
Cardiac
0%
Skeletal
0%
Smooth
0%
All of the above
Explanation
There are three types of muscle, skeletal or striated, cardiac, and smooth.
Muscle action can be classified as being either voluntary or involuntary.
Cardiac muscles are striated and involuntary.
They are found only in the heart.
They work continuously throughout human life.
Thus, the correct answer is (A).
What would be the result of an allele that codes for all actin molecules to be synthesized in linear
chains?
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0%
Immovable muscles
0%
Smooth muscle tissue
0%
Normal sarcomere structure
0%
Degeneration of muscle tissue
0%
Muscle tendons that cannot attach
Explanation
Sarcomere is the structural and functional unit of a myofibril and consists of thick myosin filaments and thin actin filaments. If the allele for actin filament continues to synthesize linear chains of the protein, sarcomere structure would be same as normal. Thus, the correct answer is option C.
The globular head of myosin contains
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0%
Calcium ions in large quantities
0%
Troponin
0%
ATPase enzyme
0%
ATP
Explanation
Myosin is a contractile protein which is involved in the activity of the muscles. It is an ATP-dependent protein which has several sites for attachment on its head. It attaches to actin with one of its attachment site and with ATPase enzyme on the globular head. The ATP hydrolysis to ADP and pi by the ATPase enzyme provides energy for the contraction of muscles.
Thus, the correct answer is option C.
Which of the following contractile proteins contributes 55% of muscle protein by weight ?
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Tropomyosin
0%
Troponin
0%
Myosin
0%
Actin
Explanation
Myosin is the protein that makes up the thick filaments and it comprises approximately 50-55% of the muscle protein by weight.
So, the correct answer is '
Myosin'.
Which of the following is the result of synthesis of actin molecule(coded by allele) in a linear chain?
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0%
Immovable muscles
0%
Smooth muscle tissue
0%
Normal sarcomere structure
0%
Degeneration of muscle tissue
0%
Muscle tendons that cannot attach
Explanation
A sarcomere is the functional unit (contractile unit) of a muscle fibre.
Each sarcomere contains two types of myofilaments: thick filaments, composed primarily of the contractile protein myosin, and thin filaments, composed primarily of the contractile protein actin. Hence, Normal sarcomere structure is the result of the synthesis of actin molecule(coded by allele) in a linear chain.
So, the correct answer is 'Normal sarcomere structure'.
Tetany is caused by
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0%
Hyperparathyroidism
0%
Hypoparathyroidism
0%
Hyperthyroidism
0%
Hypothyroidism
Explanation
The muscle cramping associated with
tetany
can be long lasting and painful. A common
cause
of
tetany
is very low levels of calcium in the body. The medical term for low calcium is hypocalcemia.
Tetany
is a disorder characterized by enhanced neuromuscular excitability that is
caused by
various metabolic abnormalities. Hypoparathyroidism results in
diminished concentration of parathyroid hormone in the blood, which causes deficiencies of calcium and phosphorus compounds in the blood and results in muscular spasms.
So, the correct answer is '
Hypoparathyroidism'
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