40. Circulatory System

Heart Physiology

Textbook Question
The studies described in Module 23.6 were funded by both government agencies and major pharmaceutical and medical supply companies. NIH grants for research on heart disease total more than \$1.2 billion per year. Gather more information and form an opinion on how heart disease research should be funded, whether by private enterprises such as pharmaceutical companies, donor-supported nonprofit organizations, or government agencies. Write an essay arguing your point of view.
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Multiple Choice
Which chamber(s) of a human heart receive(s) and pump(s) oxygenated blood?
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Multiple Choice
Heart valves function to __________.
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Multiple Choice
What is the physiological cause of a heart attack?
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Multiple Choice
Blood leaves the inferior vena cava and flows directly into the __________.
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Multiple Choice
Pressure is greatest in the ventricles when __________.
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Multiple Choice
The SA node generates an electrical impulse from its location in __________.
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Multiple Choice
A recording of the electrical activity of a patient's heart shows that the atria are contracting regularly and normally, but every few beats the ventricles fail to contract. Which of the following is probably functioning improperly?
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Multiple Choice
Your blood pressure is 120/70. The "120" indicates __________, and the "70" indicates __________.
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Multiple Choice
When we compare the structures and functions of arteries and veins, we find that the walls of arteries are __________, the blood pressure inside arteries is __________, and the blood in arteries is moving __________ the heart.
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Multiple Choice
Which of the following decreases blood pressure?
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Multiple Choice
A mutation that results in a nonfunctioning nitric oxide receptor would cause __________.
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Textbook Question
Blood pressure is highest in _________ , and blood moves most slowly in _________ .
a. Veins; capillaries
b. Arteries; capillaries
c. Veins; arteries
d. Arteries; veins
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Textbook Question
Pulse is a direct measure of
a. Blood pressure.
b. Stroke volume.
c. Cardiac output.
d. Heart rate.
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Textbook Question
When the doctor listened to Janet's heart, he heard 'lub-hiss, lub-hiss' instead of the normal 'lub-dup' sounds. The hiss is most likely due to _________ . (Explain your answer.)
a. A defective atrioventricular (AV) valve
b. A damaged pacemaker (SA node)
c. A defective semilunar valve
d. High blood pressure
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