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Which process allows oxygen to enter blood cells from the alveoli down a concentration gradient? A - OCR Gateway - GCSE Biology Combined Science - Question 7 - 2021 - Paper 1
Question 7
Which process allows oxygen to enter blood cells from the alveoli down a concentration gradient? A. Active transport B. Diffusion C. Evaporation D. Osmosis
Worked Solution & Example Answer:Which process allows oxygen to enter blood cells from the alveoli down a concentration gradient? A - OCR Gateway - GCSE Biology Combined Science - Question 7 - 2021 - Paper 1
Step 1
B. Diffusion
Answer
The correct answer is B. Diffusion.
Explanation of Diffusion
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the context of oxygen entering blood cells from the alveoli, oxygen molecules are more concentrated in the alveoli compared to the blood cells. As a result, oxygen naturally diffuses across the alveolar membrane into the blood cells, following the concentration gradient.
Importance of Diffusion in Respiration
This process is critical for respiration as it allows for the necessary exchange of gases, ensuring that oxygen can enter the bloodstream where it is needed for cellular metabolism.