Question

1). Distinguish between the central nervous system (CNS) and the peripheral nervous system (PNS) and give a general function for each.

2). What is another name for the visceral motor nervous system? What are the two (2) subdivisions of this system?

3). Explain the difference between a sensory neuron, a motor neuron & an interneuron.

4) What is the functional difference between a dendrite & an axon?

Answer 1

Answer

1)

Central nervous system	Peripheral nervous system
It comprises of brain and spinal cord It contains interneurons.	It comprises of all the nervous tissue outside brain and spinal cord. It contains sensory and motor neurons.
Function : It receives information, integrates it and initiate desired response.	Function : It functions to connect body organs (muscles, glands) to the central nervous system.

2. The another name for the visceral motor nervous system is : Autonomic nervous system.

Its two subdivisions are :

• Sympathetic nervous system
• Parasympathetic nervous system

3.

Sensory neuron	Motor neuron	Interneuron
They carry impulses from receptors to the brain or spinal cord.	They carry impulses from brain or spinal cord to the effector organs (muscle or glands).	They relay impulses between sensory neuron and motor neuron.

4. Functional difference :

Dendrite	Axon ​​​​​​​
Dendrites receive impulses from presynaptic neruron and directs it towards the cell body. Dendritic membrane acts as a post-synaptic membrane.	Axon propogates the impulse away from the cell body to another neuron. Membrane of axon terminal acts as a pre-synaptic membrane.