Does not directly stroke volum of the left ventrcle? A) defree of stretch of the

Question

Does not directly stroke volum of the left ventrcle?
A) defree of stretch of the ventricle B)frank -starling law C)amount of blood in ventricle prior to contraction D) parasympathetic stimulation E) pressure needed to open the aortic valve Does not directly stroke volum of the left ventrcle?
A) defree of stretch of the ventricle B)frank -starling law C)amount of blood in ventricle prior to contraction D) parasympathetic stimulation E) pressure needed to open the aortic valve
A) defree of stretch of the ventricle B)frank -starling law C)amount of blood in ventricle prior to contraction D) parasympathetic stimulation E) pressure needed to open the aortic valve

Explanation / Answer

Factors effecting stroke volume are amount of diastolic blood and stretching of cardiac muscles. Extrinsic factors like sympathetic stimulation increase stroke volume and parasympathetic stimulation decrease stroke volume and heart beating rate.

Thus

A) Degree of stretch of ventricle related to stroke volume. More stretched ventricle pumps blood more forcefully with increased stroke volume.

B) Frank- Sterling law states that stroke volume is intrinsically related with end diastolic volume. Means more blood in ventricle at the end of diastole more stroke volume and vice versa.

C) Amount of blood prior to contraction related to stoke volume as described above.

D)Parasympathetic stimulation decrease heart beatings and make slower to heart .

E) This is not related to stroke volume because opening of aortic valve have no relation in control of stroke volume.

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