Each hemoglobin molecule
A. contains two polypeptide chains.
B. has one heme group.
C. transports four oxygen molecules.
D. has two iron atoms and two globin chains.
E. transports one oxygen molecule.
Answer: C
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Timothy has been having difficulty breathing since he had pneumonia last month. Recently he had severe pain in his chest and back, and his breathing was extremely irregular. The doctor at the emergency room told him that one of the lobes of his lung had collapsed. How could this happen?
What will be an ideal response?
Localized vasodilation in an inflamed area is brought about by the release of ____ from ____
a. histamine; mast cells b. opsonins; B lymphocytes c. interleukin 1; mast cells d. leukocyte mediator; phagocytes e. prostaglandins; phagocytes
If alveolar volume increases, alveolar pressure
A) decreases. B) increases. C) is unchanged.
Humans often purchase antiperspirants and deodorants to suppress and mask the odors of secretions from the:
A) sebaceous glands. B) mammary glands. C) eccrine glands. D) apocrine glands.