What is the body's response of the knee-jerk reflex?
A. Contraction of the quadriceps femoris muscles
B. Contraction of the hamstring muscles
C. Contraction of the abdominal muscles
D. Contraction of the gastrocnemius muscle
Answer: A
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Which of the following does NOT cause vasodilation?
A) Increased carbon dioxide B) Increased nitrogen C) Increased hydrogen D) Increased nitric oxide
Poiseuille determined the relationship between the resistance in a vessel to several variables. Which statement is TRUE about these relationships?
A. Resistance is proportional to the radius of the vessel raised to the 4th power, the viscosity of the fluid in the vessel, and the length of the vessel. B. Resistance is proportional to the radius of the vessel raised to the 4th power, the length of the vessel, and is inversely proportional to the viscosity of the fluid in the vessel. C. Resistance is proportional to the length of the vessel, the viscosity of the fluid in the vessel, and is inversely proportional to the radius of the vessel raised to the 4th power. D. Resistance is proportional to the radius of the vessel raised to the 4th power, the viscosity of the fluid in the vessel, and is inversely proportional to the length of the vessel.
A zygote is
a) the same as an ovum b) another name for secondary oocyte c) a diploid fertilized ovum d) the same as polar body e) the mature ovarian (Graffia) follicle
Which part of the embryo contributes to the fetal portion of the placenta?
A) trophoblast B) epiblast C) inner cell mass D) hypoblast