Question

1. Your cells can break down fats using fermentation or cellular respiration. a)true b)false

2. Why does a person’s respiratory rate remain elevated after they stop exercising?Group of answer choices

A.Their muscle cells are breaking down lots of ATP

B. Their muscle cells are making lots of ATP

C.Their muscle cells are doing lots of fermentation

D. Their muscle cells are making lots of glucose
3.

What is the best explanation for why your heart rate increases during exercise?

Group of answer choices

A. Because the heart is a muscle and when you exercise you exercise all your muscles.

B. Because you need to move more oxygen around your body

C. Because your heart beating faster lets your lungs expand faster

D.Because you need to move more ATP around your body

Answer 1

Q.1. Answer- b) False

Explanation- carbohydrates are broken down using cellular respiration and fermentation process but fats are broken down by generally beta oxidation and the product acetyl-CoA is further oxidized via citric acid cycle which is the one of the process of cellular respiration. In fat catabolism fermentation does not occurs.

Q.2. Answer- B. Their muscle cells are making lots of ATP

Explanation- Muscle cells do not have large amounts of stored ATP that is sufficient for excercise. So that during exercise muscle cells starts to make ATP and respiratory rate is elevated. Respiratory rate is elevated because muscle cell produces ATP by respiration process like Krebs cycle and electron transport chain. After stopping excercise, respiratory rate is still elevated to replenish muscle cells with ATP for next requirement of ATP. To make ATP fastly, again large oxygen supply is required for elevated respiratory rate.

Q.3. Answer- B. Because you need to move more oxygen around your body

Explanation- during exercise heart rate increases to supply more oxygen to muscle cells because using oxygen muscle cells make ATP by cellular respiration. During exercise more energy is required and muscle cell do not have large storage of energy so that muscle cell have to synthesize energy at the time of exercise. For production of energy during excercise is mainly produced by aerobic respiration which requires oxygen. So that heart rate increases to supply more oxygen to muscle cells around the body.