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

Which system is primarily responsible for transporting oxygen and nutrients to cells?
A. Nervous system
B. Muscular system
C. Circulatory system
D. Endocrine system

Asked by Rodman7708

Answer (1)

The correct answer is C. Circulatory system The circulatory system, also known as the cardiovascular system, is responsible for the transportation of oxygen, nutrients, hormones, and waste products throughout the body. It plays a critical role in maintaining homeostasis and supporting the function of every organ and tissue.The circulatory system is composed of three main parts:Heart – the muscular organ that pumps blood.Blood vessels – which include arteries, veins, and capillaries.Blood – the fluid that carries oxygen, nutrients, and other substances.When you breathe, oxygen is taken in by the lungs and diffuses into the bloodstream through tiny air sacs called alveoli. From there, red blood cells (which contain hemoglobin) bind with oxygen and travel through arteries to deliver it to tissues and organs. Simultaneously, nutrients from digested food are absorbed in the small intestine and transported via blood to cells for energy and repair.Waste products such as carbon dioxide and urea are carried away by blood to the lungs and kidneys, respectively, for elimination. This two-way system keeps the body’s internal environment stable.Without a functioning circulatory system, oxygen and nutrients could not reach the cells, and waste products would accumulate, leading to organ failure. The system also helps regulate body temperature and is essential for immune defense as white blood cells are part of the blood.To compare:The nervous system controls responses and communication.The muscular system enables movement.The endocrine system releases hormones but does not transport them directly.

Answered by Sefton | 2025-07-24

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