When is the first sound of the heartbeat produced?

A. Beginning of ventricular diastole
B. Beginning of ventricular systole
C. Middle of atrial systole
D. Beginning of atrial systole


Answer: B

Anatomy & Physiology

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What is the average resting heart rate for an adult?

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Propranolol hydrochloride (Inderal) is a beta-adrenergic blocker often used as an antianginal, antiarrhythmic, and antihypertensive drug. Before giving Inderal to a patient, what should the nurse assess?

What will be an ideal response?

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Which of the following might occur after a helper T cell is presented with a processed antigen and costimulated?

A. Helper T cells destroy the presenting cell. B. Helper T cells produce antibodies. C. Helper T cells release interleukins that stimulate B cells to clone. D. Helper T cells stop division. E. Helper T cells lyse.

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The total pressure of a gas is 100 mmHg and the mixture is composed of 20% oxygen, 10% water vapor, 5% CO2, and 65% Nitrogen: What is the partial pressure of water vapor?

a. 40 mmHg b. 15 mmHg c. 35 mmHg d. 20 mmHg e. 10 mmHg

Anatomy & Physiology