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Paralysis of jaw muscles is due to loss of function of which cranial nerve?
1. lll
2. V
3. Vll
4. X

Which of the following cranial nerves in man is both sensory and motor?
1. Optic
2. Olfactory
3. Trigeminal
4. Auditory

Which of the following cranial nerves are linked with taste buds?
1. Vll & lll
2. lX & ll
3. lV & Vlll
4. Vll & lX

Smallest cranial nerve of the body is
1. Trigemminal
2. Abducens
3. Opthalmic
4. Trochlear

The fourth cranial nerve of man is
1. Abducens
2. Trochlear
3. Auditory
4. Oculomotor

The number of spinal nerves in man is
1. 31
2. 62
3. 12
4. 24

Pseudounipolar neurons occur in
1. Pyramidal cells of cerebral cortex
2. Retina of eye
3. Schneiderian membrane
4. Cells of dorsal root ganglion

Which of the following act is responsible for the depolarisation of the neuron?
1. Opening of voltage gated K+ channel
2. Opening of voltage gated Na+ channel
3. Closure of voltage gated K+ channel
4. Closure of voltage gated Na+ channel

If the inside of membrane becomes more negative it leads to
1. Depolarisation
2. Repolarisation
3. Hyperpolarisation
4. Polarisation

Suppose the terminal ends of axon are in contact with dendrites of four adjacent neurons, the nerve impulse
of the axon will
1. Travel in all the four neurons
2. Get distributed in all the four neurons resulting in a weak impulse
3. Travel only in one neuron which is in closest contact and with the same intensity
4. Travel in none of the neurons because the impulse travels from dendrites of one neuron into the axon of
another neuron

Axon endings release from its synaptic vesicles, a neuro-transmitter substance known as
1. Acetylcholine
2. Acetylcholinesterases
3. Inositol-3 phosphate
4. Diacylglycerol

Which part is involved in movement of head to locate and detect the source of a sound?
1. Superior colliculi
2. Inferior colliculi
3. Pons
4. Medulla oblongata

Which part of the brain is like a defense castle controlling moods and plays an important role in emotional behaviour, such as aggression and remembering fear?
1. Hippocampus
2. Amygdala
3. Limbic system
4. Thalamus

The link between paracoel and diocoel is through
1. Foramina Luschka
2. Foramina Magendie
3. Foramen of Monro
4. Aqueduct of Sylvius

The function of choroid plexus is
1. To produce lymph
2. To produce blood
3. To produce cerebrospinal fluid
4. To produce endolymph

Branched tree like structure present in cerebellum is
1. Arborial
2. Areole
3. Arbor vitae
4. Archenteron

The vomiting centre is situated in
1. Cerebrum
2. Cerebellum
3. Medulla
4. Hypothalamus

End of spinal cord is
1. Cauda equina
2. Conus terminalis
3. Filum terminalis
4. Funiculus

The activity of which cranial nerve can protect us by warning about harmful chemicals in the air?
1. V
2. lX
3. Vl
4. X

The corpuscles lying deep in dermis and responsible for deep pressure are known as
1. Pacinian corpuscles
2. Meissner’s corpuscles
3. Merkel’s discs
4. Ruffini’s endings

A molecule cannot be tasted or smelled until it has been
1. Converted into protein
2. Converted into transmitter
3. Grouped into multimolecular complex
4. Dissolved in a liquid

Total number of taste buds in the human tongue is approximately
1. 1000
2. 10,000
3. 1,00,000
4. 50,000

When the object is at a distance of more than 6 metres, at that time
1. Ciliary muscles are fully contracted
2. Convexity of lens is maximum
3. Eyes are fully relaxed
4. All of these

In old age, the vision of eye becomes dim. It is due to
1. Myopia
2. Hypermetropia
3. Cataract
4. Astigmatism

In hypermetropia, the image is formed
1. Before retina and is corrected by convex lens
2. Behind retina and is corrected by convex lens
3. Before retina and is corrected by concave lens
4. Behind retina and is corrected by concave lens

Which of the following structures or regions is incorrectly paired with its functions? 
1. Medulla oblongata : controls respiration and cardiovascular reflexes.
2. Limbic system : consists of fibre tracts that interconnect different regions of brain; controls movement.
3. Corpus callosum : band of fibers connecting left and right cerebral hemispheres.
4. Hypothalamus : production of releasing hormones and regulation of temperature, hunger and thirst.

The transparent lens in the human eye is held in its place by 
1. ligaments attached to the ciliary body
2. ligaments attached to the iris
3. smooth muscles attached to the ciliary body
4. smooth muscles attached to the iris

Myelin sheath is produced by 
1. Schwann Cells and Oligodendrocytes
2. Astrocytes and Schwann Cells
3. Oligodendrocytes and Osteoclasts
4. Osteoclasts and Astrocytes

Receptor sites for neurotransmitters are present on 
1. Membranes of synaptic vesicles
2. Pre-synaptic membrane
3. Tips of axons
4. Post-synaptic membrane

Good vision depends on adequate intake of carotene rich food. Select the best option from the following
statements 
(a) Vitamin A derivatives are formed from carotene
(b) The photopigments are embedded in the membrane discs of the inner segment
(c) Retinal is a derivative of vitamin A
(d) Retinal is a light absorbing part of all the visual photopigments
1. (a) & (b)
2. (a), (c) & (d)
3. (a) & (c)
4. (b), (c) & (d)

Choose the correct statements. 
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 hyperpolarized in response
to the light stimulus
4. Receptors do not produce graded potentials

Photosensitive compound in human eye is made up of 
1. Transducin and Retinene 
2. Guanosine and Retinol
3. Opsin and Retinal 
4. Opsin and Retinol

In mammalian eye, the 'fovea' is the center of the visual field, where 
1. More rods than cones are found
2. High density of cones occur, but has no rods
3. The optic nerve leaves the eye
4. Only rods are present

Destruction of the anterior horn cells of the spinal cord would result in loss of
1. Integrating impulses 
2. Sensory impulses
3. Voluntary motor impulses 
4. Commissural impulses

A gymnast is able to balance his body upside down even in the total darkness because of 
1. Organ of corti 
2. Cochlea 
3. Vestibular apparatus 
4. Tectorial membrane

Which of the following regions of the brain is incorrectly paired with its function? 
1. Cerebrum-calculation and contemplation
2. Medulla oblongata-homeostatic control
3. Cerebellum-language comprehension
4. Corpus callosum-communication between the left and the right cerebral cortices

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

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:

1. B – Blind spot – has only a few rods and cones.
2. C – Aqueous chamber – reflects the light which does not pass through the lens.
3. D – Choroid – its anterior part forms ciliary body.
4. A – Retina – contains photo receptors – rods and cones

A diagram showing 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