Most immune responses originate in
A) secondary lymphoid structures.
B) macrophages.
C) the skin.
D) primary lymphoid structures.
E) the liver.
A) secondary lymphoid structures.
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Which of the following is not true of arteries?
a. They carry blood away from the capillaries. b. They carry blood away from the heart. c. They have thicker tunica media than do veins. d. Their innermost layer is composed of endothelium.
Sodium ions are more concentrated in the extracellular fluid than in the intracellular fluid. This is an example of
A) osmotic equilibrium. B) electrical disequilibrium. C) chemical disequilibrium. D) failed homeostasis.
The process of forcefully expelling semen from the urethra is called
A) excitation. B) ejaculation. C) arousal. D) emission. E) None of the answers are correct.
A growing long bone in a child has only two areas of cartilage at the epiphysis. These two areas are the ________.
A. elastic cartilage and epiphyseal plate B. fibrocartilage and articular cartilage C. primary and secondary ossification centers D. epiphyseal plate and epiphyseal line E. articular cartilage and epiphyseal plate