Physiology Quiz -
Caffeine - Part 3

Caffeine, the most commonly consumed drug on the planet, is known to influence several physiological processes. Test your basic knowledge of the effect of caffeine on physiological systems by taking this simple quiz.

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(1) A typical cup of decaffeinated coffee contains approximately __________ of caffeine.

	(A) 5-15 mg
	(B) 20-75 mg
	(C) 75-200 mg
	(D) 200-500 mg
	(E) 1-10 g

(2) In humans, an overdose of caffeine is considered to be at amounts at or higher than about __________, and a lethal caffeine dose is considered to be approximately __________.

	(A) 1 mg, 10 mg
	(B) 10 mg, 100 mg
	(C) 100 mg, 1000 mg
	(D) 1 g, 10 g
	(E) 10 g, 100 g

(3) In humans, approximately this dose of caffeine is thought to lead to mental alertness:

	(A) ≥ 1 mg
	(B) ≥ 10 mg
	(C) ≥ 100 mg
	(D) ≥ 250 mg
	(E) ≥ 500 mg

(4) In humans, approximately this dose of caffeine is thought to lead to increased blood pressure (especially in non-habitual users):

	(A) ≥ 1 mg
	(B) ≥ 10 mg
	(C) ≥ 100 mg
	(D) ≥ 250 mg
	(E) ≥ 500 mg

(5) In humans, increases in heart rate (tachycardia) and blood pressure (hypertension) associated with high doses of caffeine are thought to be due to:

	(A) caffeine-induced elevated dopamine levels within the central nervous system.
	(B) caffeine-induced elevated epinephrine release from the adrenal glands.
	(C) caffeine binding to adenosine receptors in the central nervous system.
	(D) All of the above.

(6) In humans, caffeine causes cerebral vasoconstriction and, hence, reduced cerebral blood flow (i.e., reduced blood flow to the brain). This effect is caused by caffeine binding to __________ receptors.

	(A) dopamine
	(B) adenosine
	(C) glutamate
	(D) acetylcholine
	(E) serotonin

Checking your answers...

Posted: Thursday, September 10, 2015
Last updated: Tuesday, March 11, 2025

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Physiology Quiz -Caffeine - Part 3

Physiology Quiz -
Caffeine - Part 3