Which of the following most accurately describes the
cellular activity associated with the actual passage of
a nerve impulse?
a. electrical discharge
b. action of sodium-potassium pump
c. wave of depolarization and repolarization
d. hyperpolarization followed by rebalancing
e. active transport of ions
Answer: c
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Why is a reflex arc so fast?
A. because all the neurons involved are myelinated B. because the axons are shorter C. because the afferent and efferent cells are in the spinal cord D. because there are fewer cells involved in the network
Answer the following statements true (T) or false (F)
1. Lactoferrin and transferrin are proteins that bind iron, and therefore deprive pathogens of this essential nutrient. 2. Pyrogenic substances cause the production of pus. 3. Interferons are virus-specific, but are not species-specific. 4. Complement is the name of a single plasma protein that “complements” the actions of the immune system. 5. Eosinophils are much better phagocytes than neutrophils.
China's population control policies have
resulted in a(n) a. sharp decrease in its total fertility rate. b. shift in its gender ratio. c. increase in the abortion of female fetuses. d. ratio of 1.19 males for every female. e. all of these
Smegma is produced by which gland?
A. Skene's B. Tyson's C. Bartholin D. Cowper's