Which of these is considered the third division of the nervous system?
A. Central nervous system
B. Peripheral nervous system
C. Sympathetic nervous system
D. Enteric nervous system
D. Enteric nervous system
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As the bronchial tree terminates in bronchioles, the principal material comprising their walls is smooth muscle. What functional purpose does this smooth muscle provide?
A. The walls of the bronchioles provide patent airways to the alveoli. B. The walls of the bronchioles allow for gas exchange before air actually enters the alveoli. C. The presence of smooth muscle allows the walls of the bronchioles to constrict and provides control over air flow. D. Both a and c are true.
The waste product bilirubin is produced from
A) globin chains of hemoglobin. B) heme molecules plus iron. C) heme molecules lacking iron. D) iron found in hemoglobin molecules. E) abnormal proteins found in red blood cells.
When a person has diarrhea, how is intestinal function different than normal?
A) Greater water absorption than usual occurs in the large intestine. B) Intestinal motility is increased. C) Intestinal motility is reduced. D) Passage of nutrients into the hepatic portal system is reduced. E) None of the answers are correct.
T cells or B cells that are capable of responding to a specific antigen by binding to it with antigen-specific receptors that appear on the lymphocyte's surface are considered ________
A) clones B) complement C) self-tolerant D) immunocompetent