2. Organs of a closed circulatory system: A. Have valves a ... - cribME!
2. Organs of a closed circulatory system: A. Have valves a ... - cribME!
2. Organs of a closed circulatory system: A. Have valves a ... - cribME!
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Biology 1442 Supplemental Instruction Worksheet – Cardiovascular System Jacaruso - 2 -<br />
13. The semilunar valve(s) is/are located:<br />
a. between the right atrium and ventricle<br />
b. between the left atrium and ventricle<br />
c. where the pulmonary artery leaves right ventricle<br />
d. where the aorta leaves the left ventricle<br />
e. both a and b<br />
f. both c and d<br />
14. What is the function <strong>of</strong> a valve? _____________________________________________<br />
15. What happens when someone has a heart murmur? _______________________________<br />
16. Heart rate (beats/min) x stroke volume (vol/beat) = ______________________(vol/min)<br />
17. The sinoatrial (S-A) node is also called the _________________ <strong>of</strong> the heart because it<br />
_______________________________.<br />
18. The S-A node generates electrical impulses and initiates contraction <strong>of</strong> the ___________ .<br />
The electrical impulse moves to the ___________________________ and completes atrial<br />
contraction. The electrical impulse moves to the Bundle <strong>of</strong> His which divides and sends the<br />
impulse to the right and left bundle branches and Purkinje fibers causing the ___________<br />
to contract.<br />
19. Indicate the location <strong>of</strong> the S-A and A-V nodes:<br />
S-A ____________________________ A-V _______________________________<br />
20. What records the electrical activity <strong>of</strong> the heart? _______________________________<br />
21. The heart rate set by the S-A node can be influenced by _________________________ .<br />
2<strong>2.</strong> Rate change in heart:<br />
A. Increases heart rate when frightened a. Body temperature<br />
B. Nerves that speed up heart rate b. Epinephrine<br />
C. Increase <strong>of</strong> 1°C increases heart rate 10 bpm c. Parasympathetic<br />
D. Nerves that lower heart rate d. Sympathetic<br />
Use the following blood vessel choices to answer questions 23 - 29.<br />
a. artery b. arteriole c. capillary d. venule e. vein<br />
23. Which has the most surface area and the slowest blood flow?_____<br />
24. Which two vessels lead into and away from capillaries?________<br />
25. Which has precapillary sphincters?_____<br />
26. Which has a high pressure and rapid blood flow?_____<br />
27. Which has <strong>valves</strong>?_____<br />
28. Which one is squeezed by muscles to help move the blood?_____<br />
29. A bruise is an injury to a collection <strong>of</strong> which blood vessels?_____
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