What is the function of interstitial cells of the myenteric plexus?
A. chemoreceptors that detect the chemical composition of food
B. production of mucus for lubrication and protection
C. pacemaker cells that promote rhythmic contractions of the smooth muscle
D. release of enzymes for chemical digestion
C
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The lipoprotein known as _____________ reduces surface tension within the alveoli so they do not collapse during exhalation.
A) surfactant B) phospholipid C) beryllium D) alveolar membrane lipoprotein
Which one of the following is NOT true of the constant (C) regions of antibodies?
A) The constant regions are the same or nearly the same on all antibodies of a given class. B) The constant regions form the "stem" of an antibody. C) The constant regions determine the specific type of antibody class formed. D) The constant regions form an antigen-binding site. E) The constant regions determine how an antibody class will carry out its immune role.
Which is a major function of the skeletal system?
A) maintenance of interstitial fluid composition B) production of ATP C) support of the body D) storage of glucose E) None of the answers are correct.
By what mechanism is respiratory and cardiac function regulated in the aortic bodies?
A) Mechanoreceptors monitor the rate of blood flow. B) Baroreceptors monitor blood pressure. C) Free nerve endings detect changes in blood vessel size. D) Chemoreceptors monitor the concentration of carbon dioxide. E) None of the answers are correct.