The acrosome reaction is triggered by:
A. deposition of sperm into the female reproductive tract.
B. capacitation of sperm.
C. estrogen.
D. binding of the heads of sperm to the zona pellucida.
E. the first meiotic reduction division of the ovum.
D
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A person in the anatomic position is standing face forward, with palms of hands facing anteriorly.
Answer the following statement true (T) or false (F)
Cofactors such as NADH are found in all cells of the body and are often recycled. Such cofactors are categorized as __________ vitamins
A. essential B. nonessential
Which sequence represents the correct hierarchy of biological organization?
a. cell-organ-tissue-system-organism. b. cell-tissue-organ-system-organism. c. tissue-cell-system-organism-organ. d. organ-tissue-cell-organism-system. e. system-cell-organ-organism-tissue.
Nutrients and ions can pass directly from cell to cell through special membrane junctions known as ________
A) desmosomes B) gap (communicating) junctions C) inclusions D) microvilli E) tight junctions