In a chemical synapse, when an impulse arrives at the axon terminal, it:
1. leads to opening of the calcium channels at the post synaptic membrane
2. Stimulates the movement of synpatic vesicles towards the membrane 
3. causes the binding of the neurotransmitter of its receptors on the post synaptic neuron 
4. activates the opening the potassium channels in the axon terminal 

Consider the following statements:

I. A motor neuron along with the muscle fibers connected to it constitute a motor unit

II. The neurotransmitter released at the neuro-muscular junction is Acetylcholine.

III. Myosin head has ATPase activity

Which of the above statements are true?

1. I and II only

2. I and III only

3. II and III only

4. I, II, and III

Consider the following statements:

I. Somatic neural system relays impulses from CNS to skeletal muscles.

II. Autonomic neural system transmits impulses from CNS to involuntary organs and smooth muscles

III. Unmyelinated nerve fibres are commonly found in spinal and cranial nerves

Which of the above statements are true?

1. I and II only

2. I and III only

3. II and III only

4. I,II and III

What is coordination?
1. It is the process through which two or more organs interact and complement the functions of one another
2. It is the process of serving tissues
3. It is the process of giving blood and masses to other tissue at the level of structure
4. It is the ratio of functional and non functional organs

Which of the following would not occur when we do physical exercises?

In our body, which of the following systems do not jointly coordinate and integrate all the activities of the organs so that they function in a synchronised fashion?

Neuron cannot perform which of the following functions?

Which of the following does not has brain?

Human neural system has

CNS is not