A nurse explains oxygen movement from a capillary into a body cell. Which process is primarily responsible?
Correct answer: A. Diffusion down a concentration gradient
- A. Diffusion down a concentration gradient
- B. Active transport against a concentration gradient
- C. Filtration caused by arterial pressure
- D. Pinocytosis through the cell membrane
Explanation
Oxygen crosses the thin capillary wall and cell membrane by diffusion, moving from higher concentration in the blood to lower concentration in the tissues. Filtration mainly moves fluid, while active transport requires cellular energy.
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About Cardiovascular System
The cardiovascular system covers the chambers, valves and major vessels of the heart, the cardiac cycle, conduction pathway, blood pressure and the circulation through pulmonary and systemic circuits. It also explains artery, vein and capillary structure, exchange at capillary beds, and how the cardiac cycle differs from general blood flow.
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