Reading ComprehensionDifficulty: Medium

PT112 S2 P3 Q17 Explanation

Hormones

A free, expert breakdown of this official LSAT Reading Comprehension question.

TopicsInferenceScience

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Passage

Discussions of how hormones influence behavior have generally been limited to the effects of gonadal hormones on reproductive behavior and have emphasized the parsimonious arrangement whereby the same hormones involved in the biology of reproduction also influence sexual behavior. It has now become clear, however, that other hormones, in addition to their initiated when deviations from normal are quite small, thereby maintaining plasma osmolality within relatively narrow ranges.

In the osmoregulation of body fluids, the movement of water across cell membranes permits minor fluctuations in the concentration of solutes in extracellular fluid to be buffered by corresponding changes in the relatively larger volume of cellular water. Nevertheless, the concentration of solutes in extracellular fluid may at times become elevated or is, only after osmotic dehydration exceeds the capacity of the animal to deal with it physiologically.

What this question is testing

Inference

Your task

Find what must be true based on what the passage or stimulus states.

Common trap

Answers that are plausible or likely but not actually guaranteed by the text.

Winning move

Keep only the choice the statements fully support — eliminate anything that requires an extra assumption.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
17.

It can be inferred from the passage that which one of the following is

Answer choices

  1. Too Strong1% picked this

    The amount secreted depends on the level of steroid hormones in

    Too Strong: depends Out of Support Window: steroid The concept of steroid hormones arises in the 1st paragraph, but our Support Window of text for 'vasopressin' is in the 2nd paragraph. That should make this answer very unappealing on a first pass. The passage never says that vasopressin depends on steroid levels. We are told in the 2nd paragraph that vasopressin secretion depends on whether our body has too much water or too little water in it.

  2. Correct78% picked this

    The amount secreted is important for maintaining homeostasis in cases of both increased

    Why this is right

    This answer doesn't trace to one specific sentence, but it reflects the Gist of the Paragraph. When we have too much water, our body wants less vasopressin in the system, so that we'll pee that water out. When we have too little water, our body wants more vasopressin in the system, so that we'll keep the water in. The idea of having "too much / too little" water is synonymous with "osmolality", so this answer is also using Callback Language to encode the concept of too much or too little water. Osmolality is the balance, the homeostasis, between body fluids, which is "achieved primarily through alternations in the intake and excretion of water and sodium". Prior to learning about vasopressin, we read: It is then that complementary physiological and behavioral responses come into play to restore plasma osmolality to normal (to equilibrium / homeostasis). So the whole discussion of vasopressin is framed by the idea that it's a physiological response that affects our behavior so that the body can restore osmolality to homeostasis.

    Skill tested: Inference · how this choice captures the passage's function is the move to repeat next time.

  3. Out of Support Window: steroid2% picked this

    It works in conjunction with steroid hormones in increasing

    The concept of steroid hormones arises in the 1st paragraph but never in the 2nd. Meanwhile, our Support Window of text for 'vasopressin' is in the 2nd paragraph. The passage never says that vasopressin works in conjunction with steroid hormones.

  4. Out of Support Window: steroid3% picked this

    It works in conjunction with steroid hormones in regulating

    The concept of steroid hormones arises in the 1st paragraph but never in the 2nd. Meanwhile, our Support Window of text for 'vasopressin' is in the 2nd paragraph. The passage never says that vasopressin works in conjunction with steroid hormones.

  5. Contradicted: after thirsty16% picked this

    It is secreted after an animal becomes thirsty, as a mechanism for

    This is what we learned at the end of the 2nd: The threshold for thirst appears to be slightly higher than for vasopressin secretion, so that thirst is stimulated only after vasopressin has been released.

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