Platelets become sticky when exposed to which of the following?
A) prostacyclin
B) thrombin
C) serotonin
D) von Willebrand factor
E) fibrin
Ans: D) von Willebrand factor
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Which of the following adrenergic neurotransmitter receptors plays the major role in heart activity?
A) alpha 1 B) beta 1 C) beta 2 D) beta 3
The optic disc is forms a blind spot where the optic nerve leaves the eyeball
Indicate whether the statement is true or false
Why do some normal cells fail to respond to a chemical signal?
A) Some cells are completely without ligands. B) Signal chemicals often break down before reaching a distant target. C) Chemical signals are only delivered to specific cells. D) Some cells are completely without receptors. E) Some cells lack the necessary receptors.
Explain why ejaculation is both a sympathetic and parasympathetic reaction.
What will be an ideal response?