SAT Subject Biology Practice Question 393: Answer and Explanation

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Question: 393

3. Which of the following is/are true for a resting human?

I. Systolic blood pressure of 180 mm Hg

II. Heart rate of 60-80 beats per minute

III. Body temperature of 37oC

A. I only
B. II only
C. I and II
D. II and III only
E. I, II, and III

Correct Answer: D


D Remember your I, II, III technique-eliminate answer choices as you determine options I, II, or III to be true or false. Let's look at option I. Normal blood pressure in a resting human is about 120/80 mm Hg. The higher number (120 mm Hg) is the systolic blood pressure. Option I is false. 180 mm Hg is much too high a systolic blood pressure for a resting human. Knowing that I is false, we can eliminate choices A, C, and E. Of the remaining choices (B and D), both contain option II, so option II must be true. When you're taking the real SAT II, don't waste time thinking about option II; move right ahead to option III. For the purposes of this discussion, however, let's take a look. Option II is a heart rate of 60-80 beats per minute. This is true for a resting human. Continuing with option III: Humans do maintain a body temperature of around 37oC at rest (it increases during exercise). Because option III is true, choice B can be eliminated, leaving D as the correct answer choice.

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