The “pacemaker” for the heart is usually the:
a. sinoatrial node
b. Purkinje fibers
c. bundle of His
d. atrioventricular bundle
a. sinoatrial node
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What term describes the bundle of spinal nerves that extend from the inferior end of the spinal cord?
A) Conus medullaris B) Cauda equina C) Filum terminale D) Denticulate ligament
The weight of the skin in most adults is about:
a. 5 pounds b. 10 pounds c. 20 pounds d. 40 pounds
Which organ traps older erythrocytes so they will be removed from circulation?
A) spleen B) gallbladder C) stomach D) pancreas
A nucleotide of DNA contain three components: ________, ________, and ________
A) deoxyribose; a phosphate group; nitrogen-containing base B) ribose; three phosphate groups; nitrogen-containing base C) ribose; two phosphate groups; acid group D) ribose; a phosphate group; nitrogen-containing base