In the fetus, which blood vessel(s) carries carbon dioxide and metabolic wastes from the fetus to the placenta?
A) ductus arteriosus B) ductus venosus C) umbilical arteries D) umbilical vein
Answer: C
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The union of the proximal and middle phalanges form __________ joints.
A. pivot B. plane (gliding) C. hinge D. saddle E. condylar (ellipsoid)
Waking up from a deep sleep, a homeowner heard a burglar breaking the panes in his sliding glass door. What hormone made the homeowner have an increased heart rate, increased blood pressure, sweating, and a dry mouth?
A. Insulin B. Dopamine C. Estrogen D. Adrenaline
____________ sweat glands become active at puberty and possess ducts that
open into hair follicles. Fill in the blank(s) with correct word
The atomic number of an atom is equal to the number of ________ an atom contains
A) protons B) neutrons C) protons and neutrons D) neutrons and electrons