Pericytes are contractile cells found in which location?
a. Adherent to smooth muscle cells in the tunica media of arterioles
b. Adjacent to the surfaces of capillaries
c. Exclusively in elastic arteries
d. Within the tunica intima of veins
e. Within valves of lymphatic vessels
ANS: B
Pericytes are isolated cells that function as a miniature tunica media for capillaries.
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Select the incorrect statement about vaults
a. They may play a role in drug resistance in cancer cells. b. They are numerous and relatively large organelles. c. They are specialized transport vesicles within nuclear pores. d. They may transport ribosomal subunits out of the nucleus. e. They are not visible by ordinary staining techniques.
Which of the following is incorrect pertaining to the bony pelvis?
A) The pelvic girdle is composed of the right and left hip bones and the sacrum. B) In infants and children the hip bone is composed of three separate bones—the ilium, ischium, and pubis. C) The ala of the ilium helps to form the acetabulum. D) The ischial spine separates the greater and lesser sciatic foramina. E) The pelvic brim separates the greater (false) and lesser (true) pelves.
The cell is the smallest living portion of the human body.
Answer the following statement true (T) or false (F)
The regulation of potassium balance ________.
A) is not linked to sodium balance B) includes renal secretion, but never absorption C) is accomplished mainly by hepatic mechanisms D) involves aldosterone-induced secretion of potassium