MCQExams
0:0:1
CBSE
JEE
NTSE
NEET
Practice
Homework
×
CBSE Questions for Class 11 Medical Biology Locomotion And Movement Quiz 3 - MCQExams.com
CBSE
Class 11 Medical Biology
Locomotion And Movement
Quiz 3
The special contractile protein actin is found in
Report Question
0%
Thick filaments of A-bands
0%
Thin filaments of I-bands
0%
Both thick and thin bands
0%
Whole of myofibril
Explanation
The A-band is the thick filament and the I-band is the zone of thin filaments that is not superimposed by thick filaments as shown in figure.
These thin filaments are formed of protein named actin.
So, the correct answer is option B.
The joints between the two vertebrae are _________.
Report Question
0%
Cartilaginous
0%
Fibrous
0%
Synovial
0%
There are no joints between the two vertebrae
The smooth sustained contraction of a muscle due to fusion
of many twitches is called
Report Question
0%
Tendon
0%
Tetanus
0%
Twitch
0%
Rigor mortis
The muscles associated with the heart of insects are
Report Question
0%
Alary
0%
Radial
0%
Striped
0%
Pericardial
Papillary muscles are found in
Report Question
0%
Haemocoel
0%
Heart of cockroach
0%
Arm
0%
Heart of mammal
Explanation
Correct Option: D
Explanation:
The papillary muscles are muscles located in the ventricles of the heart. They attach to the cusps of the atrioventricular valves (also known as the mitral and tricuspid valves) via the chordae tendineae and contract to prevent inversion or prolapse of these valves on systole.
In certain parts of India muscular dystrophy is commonly found among poor people because they eat cheap pulses of
Report Question
0%
Phaseolus mungo
0%
Pisum sativum
0%
Lathyrus sativus
0%
Cicer
Explanation
Lathyrus sativus
also known as Kesari dal is mainly consumed by poor people.
It causes paralysis because of the action of neurotoxin OAA present in it.
So the correct option is C.
ATPase enzyme needed for muscle contraction is located in
Report Question
0%
Actinin
0%
Troponin
0%
Myosin
0%
Actin
Explanation
Myosin ATPase is an enzyme with ATP phosphohydrolase (actin-translocating). This enzyme catalyses the following chemical reaction: ATP + $$H_2O$$ = ADP + phosphate.
ATP hydrolysis provides energy for actomyosin contraction. Myosin is not only an actin-binding protein, but it is also an ATPase.
Myosin has
ATP-dependent
motor proteins that
help
in muscle contraction. They are responsible for
actin-based
motility.
Hence, Option c is the answer.
Actin binding sites are located on
Report Question
0%
Troponin
0%
Tropomyosin
0%
Meromyosin
0%
Both tropomyosin and meromyosin
0%
Both troponin and tropomyosin
Explanation
Actin belongs to the family of globular multifunctional protein that forms microfilaments in muscle fibers. The associated proteins along with actin found in thin filaments are troponin and tropomyosin. However, the binding sites for actin are located in meromyosin
Angular joints are present in between
Report Question
0%
Two skull bones
0%
Metacarpal and a phalange
0%
Rib and a vertebrae
0%
The atlas and axis vertebrae
Explanation
Joints in the human body are freely movable and consist of the
joint
capsule, articular cartilage, synovial membrane,
and synovial (joint) cavity. Joint movements are also divided into four types-angular, gliding, rotation and circumduction. During angular motion, the angle between joints is either increased or decreased. This type of joint is found in between the metacarpal and phalange.
Which one of the proteins is enzymatic and structural?
Report Question
0%
Actin
0%
Myosin
0%
Troponin
0%
Tropomyosin
Explanation
Myosin is a component of the myofibres in skeletal, smooth, and cardiac tissue. It also plays a role enzymatically, as it is an ATPase. It is an integral protein of muscle which mainly helps in muscle contraction by crosslinking with actin. So, the correct answer is option B.
Water content of skeletal muscles is ............... %.
Report Question
0%
25
0%
50
0%
75
0%
90
Explanation
The water and electrolyte content of skeletal muscle was an average of 78.8 gm. of water, 4.96 milliequivalent (meq.) of sodium, 8.32 meq. of potassium, 4.04 meq. of chloride, 0.445 meq. of magnesium, and 3.88 meq. of phosphorus per 100 gm. of wet tissue or muscle. Hence, the percentage of water content in skeletal muscle can vary from 75-78%.
The calcium receptive protein of the muscle is
Report Question
0%
Myosin
0%
Actin
0%
Tropomysin
0%
Troponin
Explanation
Troponin is a globular protein complex. This is the protein which is involved in muscle contraction. It is the calcium receptive protein of the muscle.
It occurs with tropomyosin in the thin filaments of muscle tissue. The binding and the release of the calcium ions causes conformational change in the structure of troponin. This results in the contraction and relaxation of the muscles.
Thus, the correct answer is option D.
Chemical ions responsible for muscle contraction are:
Report Question
0%
$${ Ca }^{ ++ }$$ and $${ K }^{ + }$$
0%
$${ Na }^{ + }$$ and $${ K }^{ + }$$
0%
$${ Na }^{ + }$$ and $${ Mg }^{ ++ }$$
0%
$${ Ca }^{ ++ }$$ and $${ Mg }^{ ++ }$$
Explanation
Calcium ions play a significant role in muscle contraction. These activate the interaction of myosin and actin, through the intervention of tropomyosin and troponin.
Magnesium, in muscle contraction, stimulates calcium re-uptake by the calcium-activated ATPase of the sarcoplasmic reticulum. It also affects the translocation of calcium ions through the smooth muscle cell membrane.
Hence, the correct option is D.
In actomyosin complex, for one unit of actin the number of units of myosin is
Report Question
0%
1
0%
Variable
0%
3
0%
4
Explanation
Actinomyosin is a
contractile complex of actin and myosin that together with ATP is active during muscular contraction. The term a
ctomyosin was coined by Szent-Gyorgyi. Actomyosin contracts in the presence of ATP and K-ions and is made of equal number of actin and myosin.
Contractile unit of muscle fibres is
Report Question
0%
Muscle fibre
0%
Sacromere
0%
Myofibril
0%
Sacrosome
Explanation
The entire cross section of the muscle fibre is taken up by long, cylindrical strands of contractile proteins called myofibrils. One myofibril is divided into segments called sarcomeres. These are the contractile units of a muscle. A dark stripe called a Z disc marks the ends of one sarcomere and the beginning of the next.
Synovial fluid is secreted by
Report Question
0%
Blood
0%
Cartilage
0%
Bone
0%
Synovial membrane
Explanation
Membranes are thin pliable layers of epithelial and/or connective tissue. They line body cavities, cover surfaces, connect, or separate regions, structures and organs of the body.
The three kinds of membranes are mucous, serous and synovial.
Synovial membrane, unlike to other membranes does not contain epithelium. Therefore, it is not the epithelial membrane. It lines the cavities of the freely movable joints. Like serous membrane, it lines structures, that do not open to the exterior. Synovial membranes secrete the synovial fluid that lubricates articular cartilage at the
ends of bones as they move at joints.
Which of the following pairs is correctly matched?
Report Question
0%
Fibrous joint- Between phalanges
0%
Cartilaginous joint- Skull bones
0%
Gliding joint- Between zygapophyses of the successive vertebrae
0%
Hinge joint- Between vertebrae
Explanation
Gliding joint is a type of synovial joint, which allows movement of bone about three axes. Gliding joint is essentially flat circular surface and permits movement within narrow limits. Examples of gliding joint are between articular surfaces (
zygapophyses
) of vertebrae, acromioclavicular joint, some carpals and tarsal bones.
Synovial fluid is present in
Report Question
0%
Spinal canal
0%
Cranial cavity
0%
Freely movable joints
0%
All of the above
Explanation
The movability of the joints varies depending on different factors. Joints have been classified into three major structural forms, namely, fibrous, cartilaginous and synovial. Synovial joints are characterised by the presence of a fluid-filled synovial cavity between the articulating surfaces of the two bones. Such an arrangement allows considerable movement. These joints help in locomotion and many
other movements.
In humans, the joint between bones of skull is
Report Question
0%
Fibrous joint
0%
Hinge joint
0%
Synovial joint
0%
None of the above
Explanation
According to functional classification joints may be immovable (synarthrosis), slightly movable (amphiarthrosis) and freely movable (diarthrosis).
According to structure joints can be classified into, fibrous, cartilaginous and synovial.
In fibrous joints, fibrous connective tissue unites articulating bones. No joint cavity is present. They are mostly immovable or slightly movable.
Sutures (literal meaning to stitch), are immovable joint found between skull bones.
There are four main sutures in the skull-
(a) Coronal suture: between the frontal and the two parietal bone.
(b) Sagittal suture: between the two parietal bones.
(c) Lambdoidal suture: between parietal and occipital bone.
(d) Squamosal suture: between parietal bone and temporal bone.
Myasthenia gravis is caused due to
Report Question
0%
Interferon
0%
Autoantibody
0%
Antigen
0%
Toxins
Explanation
Myasthenia gravis a chronic autoimmune disease in which weakness of the skeletal muscles of the body occurs.
In Myasthenia gravis, antibodies block the receptors for acetylcholine at the synapse, which prevents the muscle contraction.
Therefore, the correct answer is option B.
Sutural joints are present between
Report Question
0%
Thumb and metatarsal
0%
Humerus and radio-ulna
0%
Parietals of skull
0%
Glenoid cavity and pectoral girdle
Explanation
Sutures, meaning to stitch, are immovable joint found between skull bones.
There are four main sutures in the skull-
a) Coronal suture: between the frontal and the two-parietal bones.
b) Sagittal suture: between the two parietal bones.
c) Lambdoidal suture: between parietal and occipital bone.
d) Squamosal suture: between parietal bone and temporal bone.
Which one is both structural and functional (catalytic) protein?
Report Question
0%
Hexokinase
0%
Myosin
0%
Ribozyme
0%
Acetyl Co-A
Explanation
Myosin is found in muscle filaments. The head portion of myosin forms cross linkage with actin filaments during muscular contraction. The cross bridges between actin and myosin are very important for muscular contraction activity. Thus, myosin fulfills both structural and functional roles.
Friction is lessened in ball and socket joint by
Report Question
0%
Coelomic fluid
0%
Synovial fluid
0%
Pericardial fluid
0%
Mucin
Explanation
Synovial joints are characterised by the presence of a fluid filled in synovial cavity, between the articulating surfaces of the two bones. Such an arrangement allows considerable movement by reducing friction between bones. These joints help in locomotion and many other movements. Ball and socket joint (between humerus and pectoral girdle), hinge joint (knee joint), pivot joint (between atlas and axis), gliding joint (between the carpals) and saddle joint (between carpal and metacarpal
of thumb) are some examples.
Sacroiliac joint is
Report Question
0%
Movable
0%
Immovable
0%
Imperfect
0%
None of the above
Explanation
The sacroiliac joint connects the sacrum (triangular bone at the bottom of the spine) with the pelvis (iliac bone, that is part of the hip joint) on each side of the lower spine. It transmits all the forces of the upper body to the pelvis and legs. There is not a lot of motion in the joint and it is very strong and stable.
ATPase enzyme needed form muscle contraction is located in
Report Question
0%
Actinin
0%
Troperiin
0%
Myosin
0%
Actin
Which of the following statements is not true?
Report Question
0%
A snake moves by making loops.
0%
All animals show exactly similar movements.
0%
Snails move with the help of their muscular feet.
0%
Cockroaches possess various type of locomotion; they can walk, climb, fly.
Explanation
All animals exhibit different patterns of movements.
Example: In birds, the forelimbs are modified to result in wings, which leads to flying movement.
In case of kangaroos, the hind limbs are modified such that they contain flexible muscles resulting in their jumping movement.
In humans, the legs are modified so that they walk with two limbs only, as opposed by other vertebral mammals like dogs, cats etc. which have 4 limbs.
Cockroaches are capable of flying, walking and climbing.
Hence the statement, 'all animals show exactly same movements' is false.
So, the correct answer is option B.
A snail moves with the help of its ____.
Report Question
0%
Shell
0%
Wings
0%
Bristles
0%
Feet
Explanation
There are different modes of locomotion in different animals.
Snails have small muscular foot at the bottom of their bodies.
They move with the help of these small muscular feet.
Their body releases mucus which helps in movement and also prevents drying up of their bodies.
So, option D "Feet" is the correct answer.
Involuntary muscles are found in the:
Report Question
0%
Heart
0%
Abdomen
0%
Diaphragm
0%
All the above
An iron-containing protein myoglobin is present in the
Report Question
0%
Spleen
0%
Lungs
0%
Muscles
0%
None of the above
Explanation
Myoglobin is the iron and oxygen-binding protein that is found in the muscle tissue of the vertebrates and in almost all mammals. This contains heme, the pigment responsible for the red color of meat.
Therefore, the correct answer is option C.
Hypocalcemia (decreased $$Ca^{+2}$$ level of plasma) can lead to ______________.
Report Question
0%
Tetany
0%
Renal calculi
0%
Osteoporosis
0%
Myasthenia gravis
Explanation
Hypocalcemia
is a condition in which there are lower-than-average levels of calcium in the liquid part of the blood or the plasma.
It can be caused by lack of vitamin D.
In severe cases, symptoms include muscle cramps, confusion, and tingling in the lips and fingers, which is called tetany.
So, the current option is A.
0:0:1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
0
Answered
0
Not Answered
0
Not Visited
Correct : 0
Incorrect : 0
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Practice Class 11 Medical Biology Quiz Questions and Answers
<
>
Support mcqexams.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page
