Question

The force of contraction of the cardiac muscle is affected by: A- muscle fibre length at...

The force of contraction of the cardiac muscle is affected by:

A- muscle fibre length at start of contraction

B- contractility of heart

C- the end diastolic volume

D- amount of blood entering heart

E- All of above

Science   Anatomy-And-Physiology   
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Homework Answers

Answer #1

Dear Student,

The force of contractility of cardiac muscles depends on many factors like

* Activation of sympathetic system

*Sudden increase in afterload

*Bowditch effect- Inotropy is stimulated by an increased heart rate

*Rise in calcium levels

*Drugs (positive inotropic drugs)

*Anrep effect- increase in afterload increases contractility

*Starlings law - increase in pre-load causes increased force of contraction.

*Amount of blood entering the heart, etc

So the answer is all of the above.

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