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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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.
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
Explain why ejaculation is both a sympathetic and parasympathetic reaction.
What will be an ideal response?