Which of the following blocks voltage-gated sodium channels?
A) lidocaine
B) tetrodotoxin
C) pufferfish toxin
D) tetrodotoxin, pufferfish toxin and lidocaine
Ans: D) tetrodotoxin, pufferfish toxin and lidocaine
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The primary vesicle from which the metencephalon arises is the
A. diencephalon. B. rhombencephalon. C. mesencephalon. D. myelencephalon. E. proscencephalon.
Sperm cells mature in the
A) epididymides. B) seminal vesicles. C) ductus deferentia. D) ejaculatory ducts.
The evidence that trypsin digested protein to amino acids is ________
A) a positive Benedict's test B) a negative starch test C) the presence of a yellow color in the test tube D) the presence of a pink color in the test tube
What are the two major methods by which cells communicate to coordinate their functions?
A) positive feedback loops and negative feedback loops B) chemical messengers and/or electrical signals C) effectors and responses D) temperature gradients and pressure gradients