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FREE AND STUDY GAMES ABOUT AP CHAP 18 EXAM
QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -36 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation
Question 1: hemorrhage with a large loss of blood causes____
Answer:
a lowering of blood pressure due to change in cardiac output Question 2: the second heart sound is heard during which phase of the cardiac cycle?
Answer:
isovolumetric relaxation
Question 3: norepinephrine acts on the heart by-__
Answer:
causing threshold to be reached more quickly Question 4: if cardiac muscle is deprived of its normal blood supply, damage would primarily result from___
Answer:
decreased delivery of oxygen
Question 5: the left ventricular wall of the heart is thicker than the right wall in order to____
Answer:
pump blood with greater pressure
Question 6: which of these vessels receives blood during ventricular systole?
Answer:
both the aorta and pulmonary trunk Question 7: the fact that the left ventricle of the heart is thicker than the right ventricle reveals that is___
Answer:
pumps blood against a greater resistance
Question 8: select the correct statement about the function of myocardial cells
Answer:
the entire heart contracts as a unit or it does not contract at all.Question 9: The term for pain associated with deficient blood delivery to the heart that may be caused by the transient spasm of coronary arteries is ____
Answer:
angina pectoris Question 10: the source of blood carried to capillaries in the myocardium would be the____
Answer:
coronary arteries Question 11: which of the following is not an age related change affecting the heart?
Answer:
thinning of the valve flaps
Question 12: foramen ovale
Answer:
connects the two atria in the fetal heart
Question 13: Blood within the pulmonary veins returns to the ____
Answer:
Left atrium Question 14: select the correct statement about the structure of the heart wall.
Answer:
the myocardium is the layer of the art that actually contracts
Question 15: which of the following factors does not influence heart rate?
Answer:
skin color
Question 16: the time of day most hazardous for heart attacks is_____
Answer:
morning
Question 17: the p wave of a normal electrocardiogram indicates____
Answer:
atrial depolarization Question 18: which vessel of he heart receives blood during right ventricular systole?
Answer:
pulmonary trunk
Question 19: during contraction of the heart muscle cells____
Answer:
some calcium eenters the cell from extracellular space and triggers the relase of larger amounts of calcium from intracellular stores
Question 20: normal heart sounds are caused by which of the following events?
Answer:
closure of the heart valves
Question 21: to auscultate the aortic semilunar valve, you would place your stethoscope in the ___
Answer:
second intercostal space to the right of the sternum Question 22: which of the following is not part of the conduction system of the heart?
Answer:
AV valve
Question 23: select the correct statement about cardiac output.
Answer:
a slow heart rate increases end diastolic volume, stroke volume, and force of contraction
Question 24: compared to skeletal muscle cardiac muscle
Answer:
has gap junctions that allow it to act as a functional syncytium
Question 25: damage to the ___ is referred to as heart block
Answer:
AV node
Question 26: select the correct statement about heart valves
Answer:
the AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.Question 27: if the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells)))
Answer:
tetanic contractions might occur,which would stop the hearts pumping action Question 28: if we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid, ___
Answer:
threshold is reached more quickly and heart rate would increase
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