The internal wall surface of each ventricle displays large, smooth, irregular muscular ridges called
A. conus arteriosus.
B. atrioventricular opening.
C. pectinate muscles.
D. tendinous cords.
E. trabeculae carneae.
Answer: E
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Which of the following is a lubricant that keeps skin soft and moist and also contains chemicals that kill bacteria?
A) sweat B) sebum C) carotene D) melanin
The respiratory membrane consists of
A. two thicknesses of epithelial cells and basement membranes. B. a single thickness of epithelial cells. C. a single thickness of epithelial cells and a basement membrane. D. two thicknesses of epithelial cells.
An immediate and intense type I reaction that can be treated with antihistamines is characteristic of ________.
A. an HIV infection B. AIDS C. anaphylactic shock D. anaphylaxis E. autoimmune disease
The first meiotic division of the primary oocyte is completed
a. after fertilization. b. before ovulation. c. after ovulation. d. in the fallopian tube. e. in the uterus.