BIO 202 Practical #1

Which of the following does not affect stroke volume?

1. preload 2. contractility 3. afterload 4. all of these affect stroke volume 4!!!

Which of the following would not increase end diastolic volume?

Dehydration

Cardiac Output

HRxSV

Increased contractility of the heart results in all but which of the following?

Increased end systolic volume

Stroke Volume

SV=EDV-ESV the blood rejected by the heart

Afterload

The back pressure generated by the blood in the aorta and the pulmonary trunk

Preload

The degree to which the ventricles are stretched by the end of the EDV

End Systolic Volume

The volume remaining in the ventricle after contraction

Which of the following variables directly contributes to preload?

Venous return

Which of the following is not equivalent to the others?

a. cardiac output b. heart rate times stroke volume c. end diastolic volume d. total blood flow per minute C. end diastolic volume

The Frank-Starling Law

states that when more blood than the normal volume is returned to the heart by the venous system, the heart muscle will be streched, resulting in a more forceful contraction of the ventricles. This causes more than normal bloo to be ejected by the heart, raising SV

End Diastolic Volume

the volume in the ventricles at the end of the diastole, just before cardiac contraction