which organ is responsible for filtering and cleaning the blood
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HESI A2

HESI A2 Anatomy and Physiology Practice Test 2023

1. Which organ is responsible for filtering and cleaning the blood?

Correct answer: C

Rationale: The correct answer is C: Kidneys. The kidneys are the organs responsible for filtering and cleaning the blood. They remove waste products, regulate electrolyte levels, and help maintain fluid balance in the body through the production of urine. The other choices are incorrect because: A) Lungs are primarily responsible for gas exchange, not blood filtration. B) The heart is responsible for pumping blood, not filtering it. D) The liver plays a role in detoxification and metabolism, but it is not primarily responsible for filtering and cleaning the blood.

2. What is another word for the kneecap?

Correct answer: B

Rationale: The correct term for the kneecap is patella. It is a small, flat bone that sits at the front of the knee joint and helps in the transmission of force between the thigh and lower leg while providing protection to the knee joint. 'Patina' refers to a green or brown film on the surface of bronze or similar metals, 'pastel' is a pale, soft shade or color, and 'pathogen' is a bacterium, virus, or other microorganism that can cause disease.

3. Cobalt-60 has a half-life of 5 years. If you start with 20 g of cobalt-60, how much is left after 10 years?

Correct answer: C

Rationale: Cobalt-60's half-life of 5 years means that after 5 years, half of the initial amount remains. Therefore, after 10 years, a quarter (half of a half) of the initial amount will remain. Starting with 20 g, after 10 years, 5 g of cobalt-60 will be left. Choice A (15 g) is incorrect because it assumes a linear decrease, not considering the exponential decay characteristic of radioactive substances. Choice B (10 g) is incorrect as it overlooks that after 10 years, more decay has occurred. Choice D (2.5 g) is incorrect as it represents only an eighth of the initial amount after 10 years, not a quarter.

4. What does ONEROUS mean?

Correct answer: B

Rationale: The correct answer is B, 'Burdensome.' The term 'onerous' is used to describe something that is burdensome, oppressive, or difficult to deal with. Choices A, C, and D are incorrect because 'easy,' 'interesting,' and 'relaxing' do not convey the same meaning as 'onerous.'

5. What punctuation is needed in the following sentence to make it correct? The days seem long, but the nights seem even longer.

Correct answer: B

Rationale: The sentence needs a comma before the conjunction 'but' to correctly join the two independent clauses 'The days seem long' and 'the nights seem even longer.' This comma helps to create a clear separation between the contrasting ideas in the sentence. Choice A (Period) is incorrect because a period would create two separate sentences rather than connecting them. Choice C (Colon) is incorrect as colons are used to introduce lists, explanations, or quotations. Choice D (Apostrophe) is incorrect as it is not needed in this sentence.

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