In quiet breathing,
A) inspiration and expiration involve muscular contractions.
B) inspiration is passive and expiration involves muscular contractions.
C) inspiration involves muscular contractions and expiration is passive.
D) inspiration and expiration are both passive.
E) None of the answers is correct.
Answer: C
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Describe the areas of the heart supplied by the right and left coronary arteries
A) The right coronary artery supplies blood to left atrium and portions of both ventricles. The left coronary artery supplies blood to the right atrium, the conducting system, and interventricular septum. B) The right coronary artery supplies blood to the right atrium, portions of both ventricles, and the conducting system. The left coronary artery supplies blood to the left ventricle, left atrium, and interventricular septum. C) The right coronary artery supplies blood to the right atrium and right ventricle. The left coronary artery supplies blood to the left atrium, left ventricle, the conducting system, and interventricular septum. D) The right coronary artery supplies blood to the conducting system and interventricular septum. The left coronary artery supplies blood to all four chambers. E) The right coronary artery supplies blood to all four chambers. The left coronary artery supplies blood to the conducting system and interventricular septum.
The ossicles are part of the
A. middle ear. B. outer ear. C. inner ear.
Which of the following is true of potassium ions?
a. they are actively secreted in the proximal tubule b. their concentration is controlled by aldosterone c. changes in concentration can affect membrane excitability d. are reabsorbed in the distal tubule e. both (b) and (c)
Which of the following is not a function of the control center within a feedback mechanism?
A. receives and processes information B. controls effectors C. establishes a set point D. detects a change in the value of a variable