The "undershoot" phase of after-hyperpolarization is due to _____
A) slow opening of voltage-gated sodium channels
B) sustained opening of voltage-gated potassium channels
C) rapid opening of voltage-gated calcium channels
D) slow restorative actions of the sodium-potassium ATPase
E) ions that move away from their open ion channels
Answer: B
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Blood vessels that have thinner walls that are more likely to collapse when blood is withdrawn during a venipuncture are
a. Capillaries b. Veins c. Arteries d. Lymphatics
Select the incorrectly-matched osmoregulatory organ and the organism that uses it.
A. Malpighian tubules—insects B. antennal glands—mollusks C. protonephridia—flatworms D. nephridia—annelids E. kidney—fish
Yarrow will not alter its phenotype in responseto:a
temperature. b. soil conditions. c. being produced by sexual versus asexual reproduction. d. water conditions. e. changing altitude
Hyperglycemia indicates ______.
A. high blood glucose B. low blood glucose C. high blood fat D. low blood fat