Neural Control and Coordination

The specific receptors for neurotransmitters in a synapse are present on .

1. Pre-synaptic membrane
2. Post-synaptic membrane
3. Myelin sheath
4. Schwann cell

Which of the following is not a part of human central neural system?

1. Pericardium
2. Arachnoid
3. Dura mater
4. Pia mater

Match List I with List II: Choose the correct answer from the options given below :

1. A-II, B-III, C-I, D-IV
2. A-III, B-IV, C-II, D-I
3. A-I, B-III, C-II, D-IV
4. A-II, B-I, C-III, D-IV

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

1. Both Statement I and Statement II are correct.
2. Both Statement I and Statement II are incorrect.
3. Statement I is correct but Statement II is incorrect.
4. Statement I is incorrect but Statement II is correct.

Match List-I with List-II Choose the correct answer from the options given below:

1. A-III, B-I, C-IV, D-II
2. A-I, B-IV, C-II, D-III
3. A-IV, B-III, C-II, D-I
4. A-II, B-III, C-I, D-IV

The parts of human brain that help in regulation of sexual behaviour, expression of excitement, pleasure, rage, fear etc. are:

1. Corpora quadrigemina and hippocampus
2. Brain stem and epithalamus
3. Corpus callosum and thalamus
4. Limbic system and hypothalamus

Match List I with List II with respect to human eye.

1. A-IV, B-III, C-II, D-I
2. A-I, B-IV, C-III, D-II
3. A-II, B-I, C-III, D-IV
4. A-III, B-I, C-IV, D-II

Select the incorrect statement regarding synapses :

1. The membranes of presynaptic and postsynaptic neurons are in close proximity in an electrical synapse.
2. Electrical current can flow directly from one neuron into the other across the electrical synapse.
3. Chemical synapses use neurotransmitters.
4. Impulse transmission across a chemical synapse is always faster than that across an electrical synapse.

Match List-I with List-II : Choose the correct answer from the options given below :

1. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
2. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
3. (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
4. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)

Match the following columns and select the correct option.

1. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
2. (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
3. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
4. (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)

Which part of the brain is responsible for thermoregulation?

1. Corpus callosum
2. Medulla oblongata
3. Cerebrum
4. Hypothalamus

Which of the following statements is correct?

1. Cornea is convex, transparent layer which is highly vascularised
2. Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye.
3. Cornea is an external, transparent and protective proteinaceous covering of the eye-ball
4. Cornea consists of dense connective tissue of elastin and can repair itself.

Nissl's bodies are mainly composed of

1. free ribosomes and RER
2. proteins and lipids
3. DNA and RNA
4. nucleic acids and SER

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

1. Medulla oblongata : Controls respiration and cardiovascular reflexes
2. Corpus callosum : Band of fibers connecting left and right cerebral hemispheres
3. Hypothalamus : Production of releasing hormones and regulation of temperature, hunger and thirst
4. Limbic system : Consists of fibre tracts that interconnect different regions of brain; controls movement

The transparent lens in the human eye is held in its place by

1. smooth muscles attached to the ciliary body
2. ligaments attached to the ciliary body
3. ligaments attached to the iris
4. smooth muscles attached to the iris

Myelin sheath is produced by

1. astrocytes and Schwann cell
2. oligodendrocytes and osteoclasts
3. osteoclasts and astrocytes
4. Schwann cells and oligodendrocytes.

Receptor sites for neurotransmitters are present on

1. pre-synaptic membrane
2. tips of axons
3. post-synaptic membrane
4. membranes of synaptic vesicles.

Good vision depends on adequate intake of carotene rich food. Select the best option from the following statements.

1. A, C and D only
2. A and C only
3. B, C and D only
4. A and B only

Photosensitive compound in human eye is made up of

1. opsin and retinol
2. transducin and retinene
3. guanosine and retinol
4. opsin and retinal.

Choose the correct statement.

1. Nociceptors respond to changes in pressure.
2. Meissner's corpuscles are thermoreceptors.
3. Photoreceptors in the human eye are depolarised during darkness and become hyperpolarised in response to the light stimulus.
4. Receptors do not produce graded potentials.

Destruction of the anterior horn cells of the spinal cord would result in loss of

1. commissural impulses
2. integrating impulses
3. sensory impulses
4. voluntary motor impulses.

In mammalian eye, the 'fovea' is the center of the visual field, where

1. only rods are present
2. more rods than cones are found
3. high density of cones occur, but has no rods
4. the optic nerve leaves the eye.

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

1. Corpus callosum - communication between the left and right cerebral cortices
2. Cerebrum - calculation and contemplation
3. Medulla oblongata - homeostatic control
4. Cerebellum - language comprehension

A gymnast is able to balance his body upside down even in the total darkness because of

1. tectorial membrane
2. organ of corti
3. cochlea
4. vestibular apparatus.

Injury localized to the hypothalamus would most likely disrupt

1. short-term memory
2. co-ordination during locomotion
3. executive functions, such as decision making
4. regulation of body temperature.

Which one of the following statements is not correct?

1. Retinal is the light absorbing portion of visual photo pigments.
2. In retina the rods have the photopigment rhodopsin while cones have three different photopigments.
3. Retinal is a derivative of vitamin C.
4. Rhodopsin is the purplish red protein present in rods only.

The most abundant intracellular cation is

1. H+
2. K+
3. Na+
4. Ca++.

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

1. A - Receptor, C - Synaptic vesicles
2. A - Neurotransmitter, B - Synaptic cleft
3. C - Neurotransmitter, D - Ca++
4. B - Synaptic connection, D - K+

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

1. B - Blind spot - Has only a few rods and cones.
2. A - Retina - Contains photoreceptors, i.e., rods and cones.
3. C - Aqueous chamber - Reflects the light which does not pass through the lens.
4. D - Choroid - Its anterior part forms ciliary body.

The figure shows an axon terminal and synapse. Select the option giving correct identification of labels A-D. [Figure]

1. C-Receptor, D-Synaptic vesicles
2. A-Axon terminal, B-Serotonin complex
3. A-Action potential, C-Neurotransmitter
4. B-Neurotransmitter, D-Receptor capsules