CBSE Questions for Class 11 Medical Biology Structural Organisation In Animals Quiz 7 - MCQExams.com

The myelin sheath of neurons provides them with an insulating covering. It allows rapid transmission of signals from the nervous system to the body and vice-versa. Any damage to the myelin sheath will cause hindrance and slowing down of the transmission of signals to the axons.

So, the correct answer is 'Action potentials would be conducted too slowly along the neurons'.

• Simple squamous epithelia are found in alveoli of lungs, capillaries, glomeruli and other tissues where rapid diffusion is required.
• Simple cuboidal ephithelia are found in thyroid glands, kidney tubules, glandular ducts and ovaries, and the thyroid gland. On these surfaces, the simple cuboidal ephithelial cells perform secretion and absorption.
• Non-ciliated simple columnar epithelium lines the organs of the digestive tract including stomach, small intestine and large intestine whereas the

• The transitional epithelium is made up of multiple layers of epithelial cells with an ability to expand and contract and are found in the urinary bladder, ureters and gland ducts of the prostrate.

• A tendon is a band of connective tissue that connects muscle to bone. The tendons and muscles work together to control joint movement. It is strong and can resist stress. 
• A ligament connects a bone to another bone, usually at the joints. 
• Collagen is the fibrous protein present in our body. It is the building material of certain tissues such as tendons. 
• Cartilage is soft, gel-like padding between bones that protects joints and facilitates movement.

• In the human body, the connective tissue is widely distributed. This tissue supports and connects the various body parts.  
• Bones are the major connective tissue that supports the entire body and protects the organs. 
• They are connected to each other by ligaments. Cartilage is present at the ends of the long bones which prevent the friction between the bones during movements. 
  Thus the correct answer is option D.

• The muscle cells which are present in the heart are called cardiac muscles. These are the modified involuntary muscles. 
• Cardiac muscles have the property of both the striated muscles and smooth muscles. 
• They are striated muscles with single nuclei. The muscle fibres are fused and intercalated discs are present.
• Cardiac muscle is highly resistant to fatigue due to the rich supply of special blood vessels. 
• Thus, cardiac muscles continuously contract and relax and regulate the functions of the heart.
• So, the correct answer is option C. 

• The gizzard is a short muscular organ that has chitin in form of proventricular teeth and the plate. These teeth serve to facilitate food grinding. 
• Mandibles and maxillae are the mouthparts of a cockroach. 
• The rectum is the posterior part of the hindgut. 
  The correct answer is C.

• Adipose tissues are loose connective tissue composed mostly of adipocytes. 
• They are also known as fat-storing connective tissues. Its main role is to store energy in the form of fat. 

So, the correct answer is option C. 

Correct Option: C

Explanation:

• Myogenic- is a type of heart that functions in a rhythmic fashion. The muscle of the heart doesn’t require a neural stimulus to beat.

• In the neurogenic heart, present in most arthropods like cockroaches, the heartbeats are initiated by a nerve signal.

• Skeletal muscle and cardiac muscle are referred to as striated muscle because it has a microscopically streaked or striped appearance. 
• Unstriped muscles are the smoot muscle as they don't show any stripes on them. 
• Smooth muscle is also known as visceral muscles as it resides in the walls of hollow organs such as the urinary bladder, the uterus, the lungs, intestines and passageways walls, such as the arteries and veins and the digestive, urinary and reproductive tract.
  
• The muscle of leg and fore limb are skeletal muscle and the muscle found in  heart are know as cardiac muscle. These are striped muscles.
• While the muscle found in the intestine is smoot muscle. 
• Hence, the correct option is A.