Cardiovascular Physiology Exam Questions and Answers Latest Update Graded A+
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Course
Cardiovascular
Institution
Cardiovascular
Cardiovascular Physiology Exam Questions and Answers Latest Update Graded A+
Choose the correct order of structures that blood would contact as it traveled from the left atrium through the blood vessels and back to the right atrium.
1)abdominal aorta 2)ascending arteries 3)inferior vena cava 4)h...
Cardiovascular Physiology Exam Questions and Answers Latest Update Graded A+
Choose the correct order of structures that blood would contact as it traveled from the left atrium
through the blood vessels and back to the right atrium.
Which of the following is the correct description of a myocardial infarction and what it is caused by?
-A region of heart muscle dies due to a lack of glucose supply.
-A region of heart muscle dies due to a lack of blood supply.
-A region of muscle becomes inactive due to a lack of neuronal stimulation.
-A region of heart muscle becomes overly active. - Answers A region of heart muscle dies due to a lack of
blood supply.
How does administration of nitroglycerine help someone that might be suffering from a myocardial
infarction?
-Nitroglycerine will dilate the coronary vessels, which will increase blood flow to the heart muscle.
-Nitroglycerine will constrict the coronary vessels, which will increase blood flow to the heart muscle.
-Nitroglycerine will dilate the coronary vessels, which will decrease blood flow to the heart muscle.
-Nitroglycerine will constrict the coronary vessels, which will decrease blood flow to the heart muscle. -
Answers Nitroglycerine will dilate the coronary vessels, which will increase blood flow to the heart
muscle.
Although the lab results from Walter's blood work will take an hour, the ER physician is certain that
Walter has had a myocardial infarction. How did he reach this diagnosis without knowing the results of
the blood work?
-The ECG of Walter's heart showed the signs of a myocardial infarction.
-Walter was very clammy, pale, and incoherent.
-Walter expressed pain and tightness in his chest.
, -Walter had a bluish tint to his skin when he came in to the ER - Answers The ECG of Walter's heart
showed the signs of a myocardial infarction.
What would a balloon angioplasty do to the resistance in Walter's affected coronary vessel and how
would this improve his condition? - Answers decrease; increased blood flow to the myocardium
As blood flows away from the heart, how does overall blood pressure in vessels change? Why? -
Answers Blood pressure decreases, because of the effects of friction between the vessel walls and the
moving blood.
If the radius of a tube decreases by half, what would happen to the resistance to fluid flow? - Answers
Resistance would increase 16 times.
Which of these would cause an increase in blood flow through a vessel?
-Increased blood viscosity
-Vasodilation
-Vasoconstriction
-Increased vessel length - Answers Vasodilation
What is an advantage to the longer duration of cardiac action potential compared to the skeletal muscle
action potential? - Answers The longer duration prevents tetanic contraction, which ensures that the
heart chambers will relax and refill with blood before the next contraction.
What is the role of heart valves? - Answers Heart valves ensure one-way flow of blood through the heart
chambers.
In skeletal muscle cells, action potentials cause the release of calcium from the SR by directly opening SR
voltage-gated calcium channels. What causes the release of calcium from the SR in cardiac muscle cells?
- Answers Influx of extracellular calcium ions opens ryanodine receptors allowing Ca2+ to flow out of the
SR.
Calcium ions are removed from the sarcoplasm of the cardiac cell by the action of the sarcoplasmic
reticulum (SR) Ca2+-ATPase pump and which other mechanism? - Answers sodium-calcium exchanger
on the sarcolemma
In a cardiac autorhythmic cell, which ion is responsible for the increase in membrane potential from
threshold during an action potential? - Answers Ca2+
What structure in the intrinsic cardiac conduction system determines heart rate? - Answers the
sinoatrial (SA) node
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