Top 550+ Solved Physiology MCQ Questions Answer

a. large vesicles contain ACh

b. Na+ influx triggers fusion / exocytosis of vesicles

c. I PSP can be produced by closing K channels

d. the synaptic cleft is 100-150nm

e. neurotransmitters migrate down the axon by fast axoplasmic transport

a. it is oxidised to choline and acetate by acetylcholinesterase

b. nicotinic receptors are blocked by atropine

c. it is the main excitatory transmitter in the spinal cord

d. it is secreted by the adrenal medulla

e. tetanus blocks its release at the NMJ

a. small clear vesicles in the presynaptic tunnel contain catecholamines

b. tetanus toxin causes spastic paralysis by blocking release of ACh at NMJ

c. chemical mediators located in ???? of presynaptic fibres contain one-way conduction of impulses

d. the EPSP is an all-or-none response

e. An I-PSP can be produced by localised increase in membrane permeability to Cl-

a. angiotensin II is a neurotransmitter of the polypeptidillars

b. glutamate is an inhibitory amino acid

c. glucagons is found in hypothalamus and retina

d. vasopressin is found in posterior pituitary, medulla, spinal cord

e. serotonin is an amine

a. atropine blocks effect of acetylcholine at ???? receptor

b. reaction between active acetate and choline is catalysed by acetylcholinesterase

c. nicotinic cholinergic receptors are serpentine receptors

d. the rate limiting step in synthesis of NOVA is ?????(concussion) of tyrosine to dopa

e. MAOA is found in nerve endings and platelets

a. carries ipsilateral pain and temperature

b. ascends to the nuclei gracillis and ?????

c. receives efferents from contralateral stimuli

d. sacral efferents lie laterally

e. runs anteriorly in the cord

a. respond to compartitive temp gradient ??? skin

b. cold receptors predominate

c. warm receptors respond 30° - 100°

d. afferents carried via the dorsal column

e. warm and cold afferents carried via Ad fibre

a. rods predominate in the jovea

b. rhodopsin is the primary pigment of rods

c. lie anterior (superficial) to their neural pathway

d. colour blindness is an autosomal recessive gene

e. supplied by retinal vessels

a. miosis occurs

b. increases blood flow to the skin

c. increases thresholds in the reticular formation

d. causes erection in males

e. elevates free fatty acid levels

a. causes amylase secretion from salivary glands

b. decreases secretion from pancreatic ?????

c. relaxes the gallbladder

d. has no effect on renal arterioles

e. relaxes bronchial smooth muscle

a. post central gyrus

b. sylvian fissure

c. hippocampus

d. cingulated cortex

e. calcavine fissure

a. ATP

b. substance P

c. Ca2+

d. H+

e. K+

a. there are more warm receptors than cold receptors

b. cold receptors respond to 10-38°C

c. afferents for cold receptors are C fibres only

d. afferents found in the ventral spinothalamic tract

e. respond to the temperature gradient across the skin

a. humans are poikilothermic

b. oral temperature is usually higher than rectal temperature

c. it is usually lowest at 6am

d. children have more precise temperature regulation

e. emotion has no effect on core temperature

a. it has neural connections with the anterior pituitary gland

b. it integrates the vomiting reflex

c. the anterior hypothalamus responds to cold

d. it controls circadian rhythms via the supraoptic nuclei

e. it has osmoreceptors in the anterior hypothalamus to stimulate thirst and vasopressin release