Third and fourth ventricles of the brain are connected by

• aqueduct of Sylvious

• foramen of Monro

• foramen of Magnum

• corpus callosum

During synaptic transmission of nerve impulse, neurotransmitter (P) is released from synaptic vesicles by the action of ions (Q). Choose the correct P and Q.

• P - Acetylcholine;  Q - Ca²⁺

• P - Acetylcholine; Q - Na⁺

• P - GABA; Q - Na⁺

• P - Cholinesterase; Q - Ca²⁺

293.

Identify the origin of sympathetic nerve fibres and the location of their ganglia.

• They arise from thoracolumbar region of spinal cord and form ganglia just beside the vertebral column

• They arise from thoracocervical region of spinal cord and form ganglia just beside the vertebral column

• They arise from cranio-sacral region of spinal cord and from ganglia very close to effector organ

• They arise from thoracolumbar region of spinal cord and form ganglia very close to effector organ

Among the following characteristics, indicate the correct combination applicable to conditional reflex.

I. Acquired by practice or learning

II. Non acquired by birth.

III. Does not abolish by lack of practice

IV. Participation of cerebral cortex

V. Originates spontaneously

• I, II and III

• I, II and IV

• I and IV

• II, III and V

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

• A - Receptor; C - Synaptic vesicles

• B - Synaptic connection;  D - K⁺

• A - Neurotransmitter; B - Synaptic cleft

• C - Neurotransmitter; D - Ca²⁺

Parts A, B, C and D of the human eyes are shown in the diagram. Select the option, which gives correct identification along with its functions/characteristics

• A - retina - contains photoreceptors - rods and cones

• B - blind spot - has only a few rods and cones

• C - aqueous chamber - reflects the light, which does not pass through the lens

• D - choroidits anterior part forms ciliary body

Which excitatory neurotransmitter is involved in the transmission of impulse at the neuromuscular junction?

• Epinephrine

• Serotonin

• Acetylcholine

• Glycine

Which area of cerebral cortex is responsible for the interpretation of speech?

• Broca's area

• Wernicke's area

• Premotor area

• Association area of sensory cortex

Proximal convoluted tubule of nephron is responsible for

• filtration of blood

• maintenance of glomerular filtration rate

• selective reabsorption of glucose, amino acid, NaCl and water

• reabsorption of salts only

Which of the following statements are true for 'Motor cortex'?

I. It is located in the frontal lobe of cerebral cortex.

II It contains pyramidal cells.

III. It is responsible for all visual functions.

IV. It is essential for our thought processes.

V. It stimulates wakefulness.

VI. It regulates voluntary muscular movements.

• I, II, III and V

• II, III, IV and V

• II, IV, V and VI

• I, II, IV and VI