The predominant lipid in the cell membrane is a
A. triglyceride.
B. glycolipid.
C. phospholipid.
D. prostaglandin.
E. cholesterol.
C
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Sperm are matured and ejaculated from the epididymis and ductus deferens, which are the terminal portions of the male duct system
Indicate whether the statement is true or false
Semen is
A. responsible for engorgement of erectile tissue of the penis. B. sperm cells plus the secretions of accessory glands. C. is composed only of sperm cells. D. a vaginal secretion needed to activate sperm cells. E. produced solely by the testis.
How are endocrine and exocrine glands different from each other?
A. Exocrine glands are only unicellular in structure. B. Endocrine glands have no ducts. C. Exocrine glands have specific target organs for their secretions. D. Exocrine glands secrete hormones.
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.