Which of the following substances found in semen is mismatched with its function?
A. Mucus - lubricates urethra
B. Fibrinogen - transient coagulation of semen
C. Prostaglandins - cause urethral contractions
D. Fructose - nourishes sperm cells
E. Prostaglandins - cause uterine contractions
Answer: C
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In a study of ancient populations, what feature of skeletons would an anthropologist use to determine whether or not individuals were engaged in activities such as heavy lifting?
A. The size of the pelvis B. The markings on bones related to mechanical stress C. The microscopic structure of the compact bone D. The size and shape of the skull E. The microscopic structure of spongy bone
Molecules that carry excess cholesterol from peripheral tissues to the liver for storage or secretion in the bile are called
A) low-density lipoproteins (LDLs).
B) high-density lipoproteins (HDLs).
C) fatty acids.
D) steroids.
E) chylomicrons.
Action potentials may result from hyperpolarization or depolarization
Indicate whether the statement is true or false
Which is not characteristic of smooth muscle?
a. under involuntary control. b. does not have troponin. c. contraction is initiated neurogenically. d. found in the walls of hollow tube-like organs. e. innervation by the ANS.