. Compare the following pairs of values/activities (X and Y) and state if A. X i

Question

. Compare the following pairs of values/activities (X and Y) and state if A. X is greater than Y Y is greater than X B. C. X and Y are equal or the same X. Spontaneous rate of depolarization in the SA node Y. Spontaneous rate of depolarization in the ventricles X. velocity of impulse through the bundle of His and Purkinje system Y. velocity of impulse conduction through the AV node -X. duration of systole at resting heart rate Y. duration of systole at rapid heart rate during exercise X. stroke volume when end-diastolic volume equals 130 ml Y. stroke volume when end-diastolic volume equals 160 m X. volume of blood in the left ventricle when the left AV valve opens Y. volume of blood in the left ventricle when the left AV valve closes X. Duration of the refractory period in cardiac muscle Y. Duration of the refractory period in skeletal muscle Lecture Assignment BIOL 2402 A&PI

Explanation / Answer

i. A. X is greater than Y.

Spontaneous rate of depolarization of SA node is greater than that of the ventricles.

ii. A. X is greater than Y.

Velocity of conduction through Bundle of His and Purkinje system is greater than that through AV node.

iii. A. X is greater than Y.

During exercise systole becomes shorter.

iv. B. Y is greater than X.

Stroke volume increases with increase in load.

As no definite questions have been asked, only the first four subparts have been answered.

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