Read all statements carefully and identify the number of correct ones:

(a) Neural system provides an organised network of point-to-point connections for quick coordination.

(b) Impulse transmission across a chemical synapse is always faster than that across an electrical synapse.

(c) Cerebral aqueduct passes through the midbrain.

(d) The hypothalamus contains centers that control respiration and gastric secretions.

1. One

2. Two

3. Three

4. Four

Chemicals which are released at the synaptic junction are called

1. hormones

2. neurotransmitters

3. cerebrospinal fluid

4. lymph

A diagram showing the axon terminal and synapse is given. Identify correctly at least two of A-D:

1. B- Synaptic connection; D- K⁺

2. A- Neurotransmitter; B- Synaptic cleft

3. C- Neurotransmitter; D- Ca⁺⁺

4. A- Receptor; C- Synaptic vesicles

Receptor sites for neurotransmitters are present on:

1. Pre-synaptic membrane

2. Tips of axons

3. Post-synaptic membrane

4. Membrane of synaptic vesicles