Related Questions

Plateau (phase2) of the action potential in cardiac muscle
A Coincides with ventricular systole
B Results in prolonged refractory period
C Is due increased calcium ion influx
D Coincides with PR interval of ECG
E Is due to efflux of K+
Plateau in the cardiac muscle
A Is due to opening of slow calcium-sodium channel
B Results in prolonged refractory period
C Coincides with ventricular systole
D Is due to K+ efflux
E Is due to opening of transient calcium channel
Cell junctions make up an intercalated disc of cardiac muscle are
A Fascia adherens
B Desmosomes
C Gap junction
D Occluding junction
E Hemidesmosomes
Cardiac muscle fibres
A Have intercalated discs where there are desmosomes and gap (communicatinjunctions
B Are modified to form the nodes and conducting tissue of the heart
C Have a peripheral nucleus
D Have a T-system of tubules between the A and I bands
E Have motor end-plates
Coronary vasodilators released during cardiac muscle ischemia are:
A Adenosine
B Potassium ion
C Hydrogen ion
D Sodium ion
E Bicarbonate ion
Energy source of cardiac muscle in the fasting state are
A Fatty acid
B Glucose
C Amino acid
D Glycerol
E Ketone bodies
Detrusor muscle is a muscle of
A Urogenital diaphragm
B Urinary bladder
C Scrotum
D Spermatic cord
Weight lifting can result in a dramatic increase in skeletal muscle mass. This increase in muscle mass is attributable to
A Fusion of a sarcomeres between two adjacent myofibrils
B Hypertrophy of individual muscle fiber
C Increase in skeletal muscle blood supply
D Increase in the number of glycolytic enzymes
E Increase in the number of neuromuscular junctions
In case of muscle action at a joint
A The 'prime mover' initiates the action
B The 'prime mover' contains its effect all throughout the movement
C The 'synergist' may act or the same joint
D An 'antagonist' relaxes by the action of interneuron
E A 'fixator' fixes the distal joint
In case of muscle action on a joint
A An 'antagonist' relaxes by the action of interneurons
B A 'synergist' may act on the same joint or other joints.
C A 'fixator' fixes a distal joint.
D A 'prime mover' initiates the action but do not continue all through the movement.
E No movement may be present even when a prime mover contracts.

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