Pacemaker cells of the SA node depolarize about
A) 60-70 times per minute.
B) 40-50 times per minute.
C) 80-100 times per minute.
D) 120-140 times per minute.
E) None of the answers are correct.
C) 80-100 times per minute.
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Collagen produced by ________ cells forms ligaments that attach bone to bone.
Fill in the blank(s) with the appropriate word(s).
Cytotoxic T cells destroy their target cells by releasing perforin, which cuts holes in
A) lysosomes. B) cell membranes. C) ribosomes. D) DNA molecules.
All of the following are components of mucus EXCEPT ________
A) water B) salts C) red blood cells D) white blood cells
What are the three auditory ossicles?
A) The hyoid, mandible, and maxilla B) The temporal, sphenoid, and ethmoid bones C) The malleus, incus, and stapes D) The superior, middle, and inferior nasal conchae