Top 50+ Solved Nerves and Muscles MCQ Questions Answer

a. the highest concentration is in the brain

b. formed by hydroxylation and decarboxylation of tyrosine

c. catabolised by COMT

d. some receptors are ion channels

e. mediates smooth muscle relaxation

a. syntaxin

b. catecholamine vesicles

c. neuropeptide vesicles

d. synaptobrevin

e. calcium channels

a. nicotinic receptor

b. GABAA receptor

c. glycine receptor

d. NMDA receptor

e. 5-HT1 receptor

a. benzodiazepines

b. progesterone

c. oestrogen

d. barbiturates

e. alcohol

a. isotonic contraction does no work

b. calcium is released from troponin during contraction

c. the resting membrane potential is -70mV

d. treppe occurs in skeletal muscle only

e. white muscle has short twitch durations

a. tropomyosin is absent

b. the resting membrane potential is -90mV

c. there is a highly developed sarcoplasmic reticulum

d. there are no spike potentials

e. dense bodies are attached to the cell membrane

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