Tissues Test - 67

• The different cells in the body can regenerate in order to replace the damaged or the worn-out cells. 
• The neurons are one of the brain cells. The cells divide during the embryonal stage. After the birth of a child, the cells lose their capacity to divide. 
• These cells have the least capacity of regeneration. 
• Thus, the correct answer is option C. 

• 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 blood smears of amphibian and mammals are differentiated by the nature of RBC's because in amphibians the RBC are nucleated whereas the mammalian RBC are highly evolved so they lost their nucleus.

 

Schwann cells are cells in the peripheral nervous system that wraps around the axons of motor and sensory neurons to form the myelin sheath.

It makes the conduction of impulses through the neuron more efficient.

Thus, the correct answer is option A.

Smooth muscles are nonstriated muscles. The cells of this muscle are spindle-shaped and are uninucleated. Smooth muscles are involuntary muscles. They cannot be controlled by one's conscious will. 
Cardiac muscle is the muscle found in the heart wall. It is an involuntary muscle that is responsible for the pumping action of the heart. The heart pumps and supplies the oxygenated blood to the different tissues in the body due to the action of the cardiac muscle. They cannot be controlled by one's conscious will.

Neurons are the cells present in the nervous system. Nerve impulses begin at the sensory receptor and are carried to the CNS through the sensory neuron. The nerve impulse is transmitted through the axon of one neuron to the dendrite of the other neuron. Telodendrons present at the opposite axonic end release neurotransmitters that reach the dendrite of the other neuron through the gaps called synapse. Hence the neurons transmit information about pain to the brain. Thus the correct answer is option A.

Leucocytes or the white blood cells are concerned with immunity. They perform phagocytosis, antigen-presenting, the release of antibodies, release of cytokines, opsonization etc. to keep the immunity of the body against the pathogens. Erythrocytes or the red blood cells are responsible for the transportation of oxygen. Thrombocytes or the platelets are responsible for blood clotting.

Cuticle is a water-impervious protective layer that covers the epidermal cells of various parts of the plant and helps in limiting water loss.