Related Questions

Plateau phase in the action potential of cardiac muscle
A Is due to slow Ca+ -Na channel
B Coincides with ventricular systole
C Results in prolonged refractory period
D Is due to efflux of K+
E Is due to fast sodium channel
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+
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
Non cardiac causes of atrial fibrillation is :
A chronic kidney disease
B stroke
C Pneumonia
D Chronic liver disease
Cardiac output is not affected by __
A exercise
B anxiety
C pregnancy
D sleep

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