Which mineral helps to maintain the fluid balance of the body?

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Question 1 of 5

Which mineral helps to maintain the fluid balance of the body?

Correct Answer: A

Rationale: Potassium (A) maintains fluid balance with sodium. Cobalt (B), chromium (C), and sulfur (D) have other roles (e.g., vitamin B12, glucose metabolism, protein structure).

Question 2 of 5

Which mineral is important for the formation of red blood cells?

Correct Answer: D

Rationale: Copper (D) aids red blood cell formation via hemoglobin synthesis. Selenium (A), calcium (B), and magnesium (C) have other roles.

Question 3 of 5

A pneumothorax is caused by unusual buildup of air in the

Correct Answer: B

Rationale: A pneumothorax is air in the pleural cavity (B), collapsing the lung. Lungs (A) hold air normally, trachea (C) conducts it, and pulmonary vein (D) carries blood.

Question 4 of 5

What is urea?

Correct Answer: B

Rationale: Urea (B) is the end product of protein metabolism, excreted in urine. Not just liquid (A), solely kidney-made (C), or bladder fluid (D).

Question 5 of 5

When the pulmonary valve and the aortic valves are open, where can blood flow?

Correct Answer: C

Rationale: When pulmonary and aortic valves are open (systole), blood flows from the heart to the body/lungs (C). Not ventricles (A), atrium-ventricle (B, diastole), or atria (D).

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