Question

step 3 - reading beyond the lines

1. describe the difference between the o2 concentration in arterial blood and the o2 concentration in venous blood during exercise.

new visions for public schools - biology unit 1 - marathon runner - summer 2022

Explanation:

During venous blood exercise, oxygen is consumed by tissues, reducing its concentration in venous blood compared to arterial blood which is rich in oxygen coming from the lungs. Arterial blood has a high - oxygen concentration to supply oxygen to body tissues, while venous blood returning from tissues has given up much of its oxygen.

Answer:

Arterial blood has a higher oxygen concentration than venous blood during exercise because tissues consume oxygen from the blood as it circulates, and arterial blood is freshly oxygenated from the lungs while venous blood has already delivered oxygen to the tissues.