All of the following are true of the centrioles, except
A. they are located within the centrosome.
B. they are nonmembranous organelles.
C. they are part of the cytoskeleton.
D. they consist of microtubules.
E. they organize the mitotic spindle during cell division.
Answer: C
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Which structure is continuous with the very delicate corneal epithelium that covers the surface of the cornea?
a. fornix b. palpebral conjunctiva c. ocular conjunctiva d. medial canthus
After death, rigor mortis lasts until
A) ATP is produced. B) T-tubules recapture calcium ions. C) sodium ions are released by the sarcoplasmic reticulum. D) sarcomeres lengthen. E) myofilaments are broken down.
The reproductive system is the only system that is NOT essential to which aspect of life?
a. the life of the individual (although its activities do affect other systems) b. maintaining homeostasis c. the continuance of the species from one generation to another d. none of the above
According to the Frank-Starling Law of the heart, as contraction strength increases the stroke volume ________.
A. increases B. decreases C. shows no change