A nerve cell releases chemical messengers to trigger changes in a nearby muscle cell. This is example of a core principle known as:
A) cell-cell communication.
B) feedback loops.
C) principle of complementarity of structure and function.
D) gradients.
Answer: A
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You mix a drop of blood with a drop of an unknown solution and look at the solution under the microscope. The cells look normal to you, so the solution you mixed with the blood would likely be
A) isotonic. B) hypoosmotic. C) hypotonic. D) hypertonic. E) hyperosmotic.
The foramen ovale ________
A) connected the two atria in the fetal heart B) is a condition in which the heart valves do not completely close C) is a connection between the pulmonary trunk and the aorta in the fetus D) is a shallow depression in the interventricular septum
Cytotoxic T cells
a. are less numerous than helper T cells b. secrete B-cell growth factor and T-cell growth factor c. confer greater phagocytic properties on macrophages, converting them into angry macrophages d. release antigens e. bind with class II MHC glycoproteins
Which is the first portion of the small intestine?
A. Duodenum B. Ileum C. Cecum D. Jejunum