Question

extension when you exercise you use up available o2 & glucose in your cells to make atp. once the o2 is gone you still break down glucose in lactic acid fermentation. the process that allows you to make atp when you dont have enough o2 a condition known as muscle fatigue occurs when the waste product of the muscle activity (lactic acid) build up in the cells. until these waste chemicals are removed by o2 the fatigue will continue. 1. muscle fatigue is when our muscles are tired. what happens in our muscle cells when we experience muscle fatigue? lactic and builds up in muscle cells as waste product of anaerobic 2. why is someone breathing so hard after a strenuous (difficult) run? 3. what does an increased pulse rate indicate about the heart rate: 4. when muscles are active, cells use nutrients & o2 at a high rate and produce waste chemicals and heat more rapidly. describe how the interaction of 2 or more body systems help to maintain homeostasis during a period of high activity.

Explanation:

1. During muscle fatigue, lactic acid, a waste - product of anaerobic respiration in muscle cells, builds up as oxygen is depleted during intense exercise.
2. After a strenuous run, the body needs to take in more oxygen to remove the lactic acid (repay the oxygen debt) that has accumulated during anaerobic respiration in the muscles. So, the person breathes hard to get more O2.
3. An increased pulse rate indicates an increased heart rate. The heart is pumping blood faster to deliver more oxygen and nutrients to the active muscles and remove waste products like carbon - dioxide and lactic acid.
4. During high muscle activity, the muscular system uses nutrients and oxygen at a high rate. The circulatory system helps by increasing blood flow to deliver oxygen and nutrients and remove waste. The respiratory system increases the rate of breathing to take in more oxygen and expel carbon - dioxide. These systems work together to maintain homeostasis by ensuring the muscles have what they need and waste is removed.

Answer:

1. Lactic acid builds up in muscle cells as a waste product of anaerobic respiration.
2. To take in more oxygen to remove accumulated lactic acid (repay oxygen debt).
3. It indicates an increased heart rate.
4. The circulatory system increases blood flow to supply oxygen and nutrients and remove waste, while the respiratory system increases breathing rate to take in more oxygen and expel carbon - dioxide, maintaining homeostasis.