The second heart sound (dup) is the sound of the
pacemaker initiating its contraction.
blood entering the aorta.
closing of the semilunar valves.
closing of the atrioventricular (AV) valves.
closing of the semilunar valves.
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A future treatment for baldness may potentially be
A) scalp transplants. B) stem cells from the bulb region at the base of hair follicles. C) high protein shakes. D) head massages.
In the nucleus, DNA is wrapped with proteins. This complex is called ________.
A. cytoplasmic organelles B. a DNA wrap C. DNA particles D. chromatin E. nucleoli
There is/are pair(s) of cervical nerve(s), pair(s) of thoracic nerve(s), pair(s) of lumbar nerve(s), pair(s) of sacral nerve(s) and 1 pair of coccygeal nerve.
What will be an ideal response?
Salts are held together by:
A) ionic bonds. B) polar covalent bonds. C) nonpolar covalent bonds. D) single covalent bonds.