The epiglottis covers the laryngeal opening when you swallow. What is the significance of this action?
A) The epiglottis prevents food and beverages from "going down the wrong pipe" by blocking the entrance to the larynx.
B) The epiglottis prevents backflow of food and beverage into the pharynx.
C) The epiglottis has no known function.
D) The epiglottis allows food and beverages to enter the larynx.
A
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A drug that inhibited acetylcholinesterase would result in
A. a failure to stimulate the muscle due to decreased ACh release. B. enhanced stimulation of the muscle due to decreased ACh breakdown. C. enhanced stimulation of the muscle due to enhanced ACh release. D. poor muscle stimulation due to enhanced ACh breakdown.
Which number identifies the tarsal region?
A) 16 B) 29 C) 10 D) 20 E) 9
Answer the following statements true (T) or false (F)
1. Both B lymphocytes and T lymphocytes come from stem cells in the bone marrow. 2. Clones of B cells all share the same surface antibody molecule. 3. By early adulthood, all immature B cells have been activated. 4. Memory B cells outlive plasma B cells. 5. Both T cells and B cells have antigen receptors on their cell membranes.
The anal canal
A. contains tubular glands called crypts. B. begins at the sigmoid colon and ends at the rectum. C. contains many goblet cells. D. has an external sphincter composed of smooth muscle. E. has an internal sphincter composed of smooth muscle.