When amino acids are metabolized for energy, the nitrogen is converted to urea and then is excreted from the body by the __________.
A) skin.
B) kidneys.
C) sweat glands.
D) liver.
E) spleen.
B) kidneys.
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Which is not correct regarding the adrenal medulla?
A. Its cells are innervated by preganglionic sympathetic axons. B. It secretes the hormones epinephrine and norepinephrine. C. It is derived from embryonic neural crest cells. D. It consists of clusters of cells called oxyphil cells. E. It is red-brown in color due to its extensive vascularization.
Which muscle does not affect both the hip and the knee?
A. rectus femoris B. vastus intermedius C. biceps femoris D. semimembranosus
Braxton-Hicks contractions tend to be
A. increasingly intense as time passes. B. irregularly spaced and do not become more frequent as time passes. C. regular in timing but relatively weak. D. regular and increasingly frequent as time passes.
Which type of cartilage is found in the intervertebral discs?
A. Elastic cartilage B. Articular cartilage C. Fibrocartilage D. Hyaline cartilage E. Reticular cartilage