Cardiac Myocyte Action Potential

Question 1

Refractory period of Purkinje fibres is _____ than the refractory period of atrial mycoytes

Answer 1

Longer

Question 2

Repolarisation of cardiac mycotes occurs due tob

Answer 2

K+ efflux from slow voltage K channels

Question 3

Initiating depolarisation of cardiac myocyte is due to

Answer 3

Na+ influx from fast Na channels

Question 4

Plateau of cardiac action potential maintained by

Answer 4

K+ efflux and Ca2+ influx

Question 5

Influx of Ca2+ leads to

Answer 5

Calcium release from sarcoplasmic reticulum and muscle contraction

Question 6

What voltage is the resting membranes potential?

Answer 6

-90mV

Question 7

Absolute refractory period

Answer 7

Interval in which second AP cannot be elicited regardless of intensity of applied stimulus

Question 8

Relative refractory period

Answer 8

Second AP may be elicited with greater threshold of stimulus. Hyperpolarisation