___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
In chemical synapse, postsynaptic membrane receptor
binds with
1. Excitatory neurotransmitter.
2. Inhibitory neurotransmitter.
3. Ca++ ions.
4. Both 1 and 2
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
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?
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
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
Mark the incorrect match:
1. |
Cerebral aqueduct |
→ |
A canal passes through the midbrain, connecting 3rd ventricle to 4th ventricle of brain. |
2. |
Corpus callosum |
→ |
Thick band of nerve fibres that divides the cerebral cortex lobes into left and right hemispheres. |
3. |
Limbic system |
→ |
The inner part of forebrain involved in the regulation of sexual behaviour. |
4. |
Pons |
→ |
Consist of fibre tracts that interconnect different regions of the brain. |
Match each item in Column I with one item in Column II and choose your answer from the codes given below:
Column I |
Column II |
||
I. |
Influx of sodium |
1. |
Original establishment of RMP |
II. |
Efflux of potassium |
2. |
Repolarization |
III. |
Na+/K+ pump |
3. |
Depolarization |
IV. |
Ca++ |
4. |
Plateau in cardiac muscles |
Codes :
I |
II |
III |
IV |
|
1. |
3 |
2 |
4 |
1 |
2. |
2 |
1 |
4 |
3 |
3. |
2 |
1 |
3 |
4 |
4. |
3 |
2 |
1 |
4 |
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
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