The phase in the cardiac cycle when the mitral valve is closed and the aortic valve is open is the

_____ – backflow of blood

A fine tubular wire mesh called a ________ may be inserted into a coronary vessel, holding it open.

Directions: Read each short-answer essay question carefully, and answer the question fully. (20Xs) Explain how the body returns to homeostasis when the blood pressure is too low  

_____ – respond to changes in blood pressure; adjust cardiac output and peripheral resistance to maintain normal arterial pressures

_____ – change the pattern of blood flow within capillary beds in response to chemical changes in interstitial fluids

When renin is released from the kidney,

According to the Frank-Starling principle, the greater the end-diastolic volume the more powerful the succeeding _____

System circulation involves blood flow to and from the heart and the:

The muscle layer of the heart is the