which of the following is the main organ responsible for regulating sleep
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ATI TEAS 7

TEAS 7 practice test science

1. Which of the following is the main organ responsible for regulating sleep?

Correct answer: B

Rationale: The main organ responsible for regulating sleep is the hypothalamus. The hypothalamus plays a crucial role in controlling the body's circadian rhythm, which is the internal clock that regulates the sleep-wake cycle. It receives input from the eyes about light and darkness, aiding in determining when it's time to sleep or wake up. Additionally, the hypothalamus regulates the production of melatonin by the pineal gland, a hormone that helps control sleep patterns. While the thalamus relays sensory information to the brain, the pituitary gland is primarily responsible for hormone production and release, and the pineal gland produces melatonin under the control of the hypothalamus. Therefore, the hypothalamus is the correct choice as the main organ involved in sleep regulation.

2. Which of the following sentences contains an opinion on the part of the author?

Correct answer: D

Rationale: The sentence in answer choice D expresses the opinion of the author by suggesting that scholars in the 21st century are hasty in dismissing the role of religion in political disputes. This opinion is presented without factual evidence or support within the passage, making it an opinion rather than a statement based on information provided in the text. Choice A simply states facts about James being a practicing Catholic and how it affected him, without expressing any opinion. Choice B also presents a factual statement about King Charles I's commitment to the Protestant Church of England. Choice C provides historical information about the Battle of Culloden and the religious state of England and Scotland, without any opinion from the author.

3. What is the value of 0.0523 expressed as a fraction?

Correct answer: A

Rationale: To convert a decimal to a fraction, place the decimal value over the place value of the last digit. In this case, 0.0523 can be expressed as 523/10000 since the last digit is in the ten-thousandths place. Choice A is correct. Choices B, C, and D are incorrect because they represent different decimal values and do not match the correct conversion of 0.0523.

4. What is molarity a measure of in a solution?

Correct answer: C

Rationale: Molarity is a measure of the concentration of a solute in a solution. It is defined as the number of moles of solute per liter of solution. Molarity is not a measure of the volume of the solvent (choice A), the amount of solute (choice B), or the temperature of the solution (choice D). Therefore, the correct answer is the concentration of solute (choice C) as molarity specifically quantifies the solute concentration in a solution.

5. What is the difference between isometric and isotonic muscle contractions?

Correct answer: B

Rationale: The correct answer is B. Isometric contractions occur when the muscle generates tension without changing its length, while isotonic contractions involve the muscle changing length to move a load. In isotonic contractions, the muscle shortens to move a load, whereas in isometric contractions, the muscle contracts to hold a position without movement. Choice A is incorrect because isometric contractions do not involve movement, while choice C is incorrect as isotonic contractions typically require more energy due to movement. Choice D is incorrect because the type of muscle involved (smooth or skeletal) is not the defining factor between isometric and isotonic contractions.

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