Exercise and heart rate?

• What does your body do when you exercise to get enough energy to your cells?

  Your body responds in different ways to get enough energy to your cells.
• Why do muscles need energy from respiration when you exercise?

  Muscles need energy from respiration to contract (shorten).
• What happens to muscle contractions during exercise?

  Some of your muscles contract more often.
• What is the result of increased muscle contractions during exercise?

  You need more energy.
• How does increased energy demand during exercise affect respiration?

  This energy comes from increased respiration.
• What does increased respiration in your cells require?

  You need to get more oxygen into them.
• How does your body increase oxygen intake during exercise?

  Your breathing rate increases.
• What happens to your breath volume when you exercise?

  Your breath volume increases.
• What happens to your heart rate during exercise?

  Your heart rate increases.
• Why do you increase your breathing rate and breath volume during exercise?

  To get oxygen into your blood quicker.
• What is blood containing oxygen called?

  Oxygenated blood.
• Why does your heart rate increase during exercise?

  To get oxygenated blood around the body faster.
• What happens when you do really hard exercise?

  Your body can't supply oxygen to your muscles quickly enough.
• What do muscles start doing when oxygen supply is insufficient during hard exercise?

  Muscles start doing anaerobic respiration.
• Why is anaerobic respiration not the best way to transfer energy from glucose?

  Because lactic acid builds up in the muscles, which gets painful.
• What is muscle fatigue?

  Muscle fatigue is when the muscles get tired and stop contracting efficiently.
• What is an "oxygen debt"?

  An oxygen debt is the amount of extra oxygen your body needs after exercise.
• Why do you have to "repay" the oxygen after exercise?

  Your lungs, heart, and blood couldn't keep up with the demand for oxygen earlier on.
• What happens to your breathing after you stop exercising?

  You have to keep breathing hard for a while after you stop.
• What is the purpose of breathing hard after exercise?

  To get more oxygen into your blood, which is transported to the muscle cells.
• What are the physiological responses of the body during exercise?

  • Increased breathing rate
  • Increased breath volume
  • Increased heart rate
  • Increased respiration to supply energy
• What are the consequences of anaerobic respiration during hard exercise?

  • Lactic acid buildup in muscles
  • Muscle fatigue
  • Oxygen debt
• What is the process of repaying oxygen debt after exercise?

  1. Continue to breathe hard
  2. Increase oxygen intake
  3. Transport oxygen to muscle cells