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In Biology / Senior High School | 2025-07-24

What is the main function of red blood cells?
A. To fight infections
B. To carry oxygen
C. To digest nutrients
D. To produce hormones

Asked by joybriones5534

Answer (1)

The correct answer is B. To carry oxygen The primary function of red blood cells (RBCs), also called erythrocytes, is to transport oxygen from the lungs to every tissue in the body. These cells contain a special protein called hemoglobin, which binds oxygen molecules when blood passes through the lungs. Each hemoglobin molecule can carry up to four oxygen molecules.When the red blood cells travel through arteries and reach the capillaries near body tissues, they release the oxygen so that it can be used by cells during cellular respiration, the process that produces energy. At the same time, RBCs pick up carbon dioxide, a waste product of respiration, and transport it back to the lungs for exhalation.Red blood cells are uniquely structured for this task. They are biconcave in shape, meaning they have a flattened, round appearance with a dip in the center. This shape increases the surface area for gas exchange and allows them to squeeze through even the narrowest capillaries. Moreover, mature RBCs in humans do not have a nucleus, allowing more room for hemoglobin and more efficient oxygen transport.If red blood cells are low (a condition called anemia), the body doesn't get enough oxygen, leading to fatigue, weakness, and difficulty concentrating. In contrast, white blood cells are responsible for defending the body against pathogens, and hormones are produced by endocrine glands, not by red blood cells.Therefore, red blood cells play a critical role in respiration and energy production, making them essential for survival.

Answered by Sefton | 2025-07-24

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