During exercise, the heart rate increases due to:

Supply more lactic acid to the muscles for anaerobic respiration

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Supply more oxygen and glucose to the respiring cells

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Keep up with the pulse rate

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Keep down the pulse rate

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Solution

The correct option is B
Supply more oxygen and glucose to the respiring cells

During heavy exercise like fast running, cycling, walking for many hours or heavy weight lifting, the demand for energy is high but the supply of oxygen to produce the energy is limited. So, the heart rate increases to supply more oxygen and glucose to the respiring cells. Anaerobic respiration takes places in the muscle cells to fulfil the demand of energy.

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Similar questions

When you exercise vigorously a rate of breathing increases, why?

Option 1 : the supply more oxygen to cells to release more energy

Option 2 : to remove the lactic acid formed

Option 3 : to increase the heartbeat

Option 4: to expand and contract the lungs

Q. In animal cells, like muscles during exercise, when oxygen is inadequate for cellular respiration pyruvic acid is reduced to lactic acid by?

Q. Assertion :Anaerobic respiration sometimes occurs in our skeletal muscles during strenous exercise. Reason: Pyruvic acid is reduced to lactic acid by lactate dehydrogenase in the absence of oxygen.

Lactic acid produced during anaerobic respiration can be broken down completely when ________ is supplied.

Question 1
Sometimes when we do heavy exercise, anaerobic respiration takes place in our muscle cells. What is produced during this process?

(a) Alcohol and lactic acid
(b) Alcohol and $C O_{2}$
(c) Lactic acid and $C O_{2}$
(d) Lactic acid only

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