haemoglobin

Question 1

The blood leaving a muscle has a lower pH than the blood entering it. During vigorous exercise, the fall in pH is even greater. Explain what causes this greater fall in pH.

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Answer 1

(in exercise) - faster respiration rate meaning more CO2 production;
CO2 is acidic / forms carbonic acid / lactic acid production;
release of H+ ions;

Question 2

Explain how oxygen in a red blood cell is made available for respiration in active tissues.

Answer 2

Low pH / (more)H+ ; due to (increased)

CO2 (increased) respiration;
(ignore refs to buffering action of haemoglobin)
(increased) dissociation of haemoglobin;

Oxygen diffuses from r.b.c. to tissues;