What is the longest timeframe that sperm can survive in the female reproductive tract?
a. 24 hours
b. 48 hours
c. 72 hours
d. 5 days
e. 7 days
d
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Which of the following phrases is least likely to be used in describing erythrocytes?
A. Cells can change shape B. Biconcave cells C. Nucleus is centrally located D. Main role is transporting blood gases E. Cytoplasm contains hemoglobin
An activated ________ rapidly divides to form a clone of plasma cells, which produce antibodies and memory cells.
A. antigen presenting cell B. T lymphocyte C. macrophage D. B lymphocyte
The external auditory canal is part of the
A. middle ear. B. outer ear. C. inner ear.
In comparison to a low-density lipoprotein (LDL), a high density lipoprotein (HDL) contains
A. less lipid. B. less protein. C. more cholesterol. D. more carbohydrate. E. more amino acids.