Exercise and Oxygen Debt
Medium-difficulty multiple-choice questions that test facts and applied reasoning based on the video 'Exercise and Oxygen debt'.
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Quiz Questions & Answers
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Question 1: Why does breathing rate and breath volume increase during exercise?
To increase carbon dioxide production in the muscles
To cool the body by evaporating moisture from the lungs
Because lungs temporarily store extra energy that must be expelled
To deliver more oxygen to muscles to support higher cellular respiration
Question 2: What is the primary consequence when oxygen supply to muscles cannot meet demand during intense exercise?
Respiration halts and is replaced by photosynthesis-like processes
Cells begin anaerobic respiration and produce lactic acid
The body increases bone density to support extra work
Muscles immediately stop contracting to conserve oxygen
Question 3: How does the body repay an oxygen debt after exercise?
Oxygen reacts with lactic acid in the liver to convert it back to glucose
Oxygen directly neutralizes lactic acid inside muscle cells without blood transport
Lactic acid is exhaled directly through the lungs
Muscles crystallize lactic acid for later use
Question 4: Which simple field measurement did the video recommend for monitoring the heart's response to exercise?
Listen for lactic acid sounds in the muscles with a stethoscope
Count breaths and divide by two to get the heart rate
Use a thermometer on the chest to detect beats
Measure the pulse by placing two fingers on an artery in the wrist or neck
Question 5: What practical sign mentioned in the video indicates you are repaying an oxygen debt after stopping exercise?
Immediate reduction of heart rate to resting levels
Permanent removal of lactic acid without increased breathing
A sudden warm chill across the limbs
Doubling over and panting as you breathe heavily
Question 6: Which of these best explains why increased breathing itself requires more energy during exercise?
Because air pressure in the room drops when many people exercise
Because muscles around the lungs must work harder to move air in and out
Because lungs produce lactic acid that must be removed
Because oxygen molecules become heavier during exercise
Question 7: When designing an experiment from the video, what two measurements are recommended to assess exercise effects?
Sweat salt concentration and hair growth
Blood glucose every five seconds
Skin color and fingertip strength
Breathing rate and heart rate