Excericse

Question 1

During Exercise what happens to our body?

Answer 1

• Body needs a great deal of enegry for Muscle contraction:
• So body has to increase the demand for energy.
• body has to react to the increased demand of energy.
• More energy needed by the body= Increase aerobic respiration.

Question 2

How does the body get more oxygen?

Answer 2

• Breathing rate + Breathing volume increases.
• Breathe: More frequently.
• Take deeper breathes.
• Gets more oxygen into the blood stream.
  Heart rate: Increases.
• Pump oxygenated blood around the body.

Question 3

What happens if a person exercises too hard?

Answer 3

• Not enough oxygen can be supplied to the muscles.

- At this point: Anearobic respiration takes place in the muscles.

Question 4

Anaerobic respiration:

Answer 4

• Glucose —> Lactic Acid.
• When muscles respire anearobically:
• Glucose is converted into lactic acid.
• No oxygen is needed.
• Releases less energy because:
• Oxidation of glucose molecules is incomplete.

Lactic Acid damaging:

• Causes person to become fatigue in long periods of exercise.
• Causes muscles to stop contracting effiencently.

Question 5

What happens when there is a lot of lactic acid?

Answer 5

• Body has to remove lactic acid from the muscles.

- Creates condition known as oxygen debt.

Question 6

What happens to the lactic acid?

Answer 6

• Transported out of the muscles by the blood.
• Taken to liver converted back into glucose in a series of chemical reactions.
• Reacting with the lactic acid and removing it requires oxygen.

Question 7

Definition of Oyxgen debt:

Answer 7

• Amount of extra oxygen, the body needs after exercise to deal with the accumulated lactic acid.