In the human body, muscle cells have an increased need for energy during exercise. to supply this energy, the body will immediately increase - f the need for waste products to be retained g food intake to increase the substances available for respiration h the breathing rate to supply more oxygen to cells for the release of energy j activity in the nervous system to stimulate intake of carbon dioxide

The correct answer is option (h) the breathing rate to supply more oxygen to cells for the release of energy.

Breathing refers to the process of inhaling oxygen and exhaling carbon dioxide from the lungs. A normal breathing rate at rest is around 15 breathes per minute which is significantly increased to 40 -50 breathes per minute during vigorous activity or excercise.

During exercise, the breathing rate, pulse rate and lactic acid levels increase in the human body. Muscle cells have an increased need for energy and heart pumps more oxygen to the muscle cells to meet the requirement. Breathing rate increases to supply more oxygen to the muscle cells which is required for the oxidation of the glucose, release of more energy and to get rid of the carbon dioxide.

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