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

Restoration of resting potential of the membrane at the site of excitation is achieved by:-

1. Diffusion of K${}^{+}$ outside the membrane
2. Diffusion of Na${}^{+}$ outside the membrane
3. Diffusion of K${}^{+}$ inside the membrane
4. Diffusion of Na${}^{+}$ inside the membrane

Which of the following is/are controlled by the human brain ?

a. Balance of the body

b. Circadian rhythm of the body

c. Human behaviour

d. Functioning of heart and kidneys

1. Only d

2. a and d

3. a,b and c

4. a,b,c,d

In chemical synapse, postsynaptic membrane receptor
binds with
1. Excitatory neurotransmitter.
2. Inhibitory neurotransmitter.
3. Ca⁺⁺ ions.
4. Both 1 and 2

___A___ is a major coordinating centre for sensory and motor signaling present in the forebrain of the central nervous system. Here ‘A’ is:

1. Association area
2. Thalamus
3. Pons
4. Hypothalamus

Mark the incorrect match:

Five events in the transmission of nerve impulse across the synapse are given–

A. Opening of specific ion channels allows the entry of ions, a new action potential is generated in the post synaptic neuron.

B. Neurotransmitter binds to the receptor on post synaptic membrane

C. Synaptic vesicle fuses with pre-synaptic membrane, neurotransmitter releases into synaptic cleft

D. Depolarization of pre-synaptic membrane

E. Arrival of action potential at axon terminal.

In which sequence do these events occur?

$1. \mathrm{E} \to \mathrm{D} \to \mathrm{C} \to \mathrm{B} \to \mathrm{A}$
$2. \mathrm{A} \to \mathrm{B} \to \mathrm{C} \to \mathrm{D} \to \mathrm{E}$
$3. \mathrm{A} \to \mathrm{B} \to \mathrm{D} \to \mathrm{C} \to \mathrm{E}$
$4. \mathrm{E} \to \mathrm{D} \to \mathrm{C} \to \mathrm{A} \to \mathrm{B}$

Receptor sites for neurotransmitters are located on the:

1. tips of axons

2. axon membranes in the regions of the nodes of Ranvier

3. postsynaptic membrane

4. presynaptic membrane

Which of the following structures or regions is
incorrectly paired with its function?

1. limbic system—screening of information between
the spinal cord and the brain; regulates arousal
and sleep

2. medulla oblongata—homeostatic control center

3. cerebellum—unconscious coordination of
movement and balance

4. corpus callosum—band of fibers connecting left
and right cerebral hemispheres

Select the incorrect statement: