1
lesson pretestMultiple Choice

Pretest

Question 1 • Biology

Which component of blood allows oxygen from the air to move from the lungs to cells of the body?

Answer
A
platelets
B
white blood cells
C
plasma
D
red blood cells

Explanation

Red blood cells contain hemoglobin, a protein that binds oxygen in the lungs and carries it through the bloodstream to the body's cells. Platelets help blood clot, white blood cells fight infections, and plasma is the liquid that carries blood cells and other substances.

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