Interactive Physiology Worksheet

worksheet
Interactive Physiology Worksheet:
Cardiovascular System: Cardiac Cycle differences of blood pressure
1. Valves open in response to ______________________________________ on their two sides.

2. List the chambers/vessels that the four valves connect:
Chamber
Right ventricle
Left ventricle

Valve
Pulmonary semilunar
Aortic semilunar

Chamber/Vessel
Pulmonary trunk
Aorta

Left atrium

Mitral

Left ventricle

Right atrium

Tricuspid

Right ventricle

mid to late diastole 3. a. Ventricular filling occurs during ________________________ ventricular ________________. av valves atrioventricular b. Blood flows through the ____________________, or __________, valves into the ventricles.

4. During ventricular
systole, what closes the AV valves? interventricular pressure is greater then atrial pressure
_____________________________________________________________________________

5. During ventricular systole, what opens the semilunar valves? interventricular pressure is greater than pressure in pulmonary trunk and aorta
_____________________________________________________________________________

6.
During isovolumetric relaxation, what closes the semilunar valves?
_____________________________________________________________________________
blood flow back toward the heart due to aortic pressure being greater than interventriuclar pressure

7. During isovolumetric relaxation, what opens the AV valves? atrial pressure is greater than interventricular pressure
_____________________________________________________________________________

8. Why is hypertension hard on the heart? ventricular pressure must rise higher to open the semilunar valves; the same increase in a normal BP, less
_______________________________________________________________________________

blood is ejected in a hypertensive case so the heart with hypertension must work harder to eject the same
_______________________________________________________________________________ SV

_______________________________________________________________________________

Page 1 of 2
BIO1014 Anatomy and Physiology II Lab
© 2013 South University

9. Looking at the Ventricular Volume graph, the stroke volume is approximately how many ml?
70
________________

10.

During the four phases listed below, state whether the AV and semilunar valves are open or

closed:
Phase

AV Valves

Semilunar Valves

Ventricular filling

Open

Closed

Isovolumetric contraction

Closed

Closed

Ventricular ejection

Closed

Open

Isovolumetric relaxation

Closed

Closed

Page 2 of 2
BIO1014 Anatomy and Physiology II Lab
© 2013 South University