Top 550+ Solved Physiology MCQ Questions Answer

a. contains two separate halves of an A-band and an I-band

b. is the space between two A-bands

c. is between two Z-lines

d. has the T-system of the sarcotubular system at sarcomere junctions

e. contracts when the troponin molecule binds to the myosin head

a. have fast glycolytic rates

b. have low oxidative capacity

c. are more commonly found in muscle that performs explosive work

d. do not have a very high glycolytic capacity

e. are not abundant in endurance athletes

a. resting membrane potential is about -90mV

b. energy source at rest is mainly fat

c. mechanical response lasts about twice as long as electrical response

d. tetanus cannot occur

e. it has an all-or-nothing contractile response

a. it causes skeletal muscle hypertrophy

b. does not lead to fibrillation

c. causes hyposensitivity to acetylcholine in skeletal muscle

d. smooth muscle is able to contract if it occurs in vivo

e. causes fasciculations

a. A-beta

b. A-gamma

c. A-delta

d. B

e. C

a. C

b. A-alpha

c. B

d. A-gamma

e. A-beta

a. phosphorylcreatine

b. fatty acids

c. glucose

d. glycogen

e. creatine

a. adaptation occurs over the temperature range 20-40°C

b. pain is sensed by naked nerve endings

c. pacinian corpuscles are rapidly adapting touch-pressure receptors

d. naked nerve endings can detect all four cutaneous sensory modalities

e. any given nerve ending can signal more than one sensory modality

a. glutamate is excitatory

b. GABA is inhibitory at presynaptic neurons

c. glycine is excitatory at postsynaptic neurons

d. GHB (gamma hydroxybutyrate) is inhibitory

e. aspartate is excitatory

a. is classically initiated by tapping on the quadriceps muscle

b. is initiated by stretch of the muscle

c. involves impulses being conducted from the muscle spindle to the motor cortex

d. involves extrafusal fibres stimulating annulospiral and flowerspray sensory fibres

e. involves gamma afferents of leksell

a. actin

b. myosin-II

c. tropomyosin

d. almodulin

e. troponin

a. T-system lies at Z-lines

b. functions as a syncytium due to the presence of tight junctions

c. intercalated discs occur at Z-lines

d. contains large numbers of elongated mitochondria

e. thin filaments include troponin T, C and I

a. sodium ions enter via “fast” channels in phase 0

b. chloride ions may enter cell during phase 1

c. sodium ions enter via “slow” channels in phase 2

d. relative refractory period ends in phase 3

e. class I anti-arrhythmics reduce the slope of phase 4

a. A-alpha

b. A-beta

c. A-gamma

d. A-delta

e. B

a. smooth muscle cells possess synapses en passant

b. about 10 times as much acetylcholine as is required is released at skeletal muscle neuromuscular junctions

c. antibodies can develop to calcium channels in nerve endings at neuromuscular junctions

d. more than one nerve fibre ends on each end-plate in skeletal muscle

e. acetylcholine is released by exocytosis