Consider the following statements:

I. Acetylcholine is released at the electric synapse.

II. Electric synapses are faster.

III. It is more difficult to regulate an electric synapse with respect to a chemical synapse.

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

Receptor sites for neurotransmitters are present on
1. membrances of synaptic vesicles
2. pre-synaptic membrane
3. tips of axons
4. post-synaptic membrane

Stimulation of a muscle fibre by a motor neuron occurs at

1. the neuromuscular junction

2. the transverse tubules

3. the myofibril

4. the sacroplasmic reticulum

A diagram showing axon terminal and synapse is given. Identify correctly A-D.

1. A- Receptor                  C-synaptic Vesicles

2. B-Synaptic connection   D-K⁺

3. A-Neurotransmitter        B-Synaptic cleft

4. C-neurotransmitter        D-Ca²⁺        

Alzheimer disease in humans is associated with the deficiency of

1. dopamine

2. glutamic acid

3. acetylcholine

4. Gamma Amino Butyric Acid (GABA)