Question

while performing strenuous exercise, a person may experience a temporary shortage of oxygen. as a result, anaerobic respiration supplies the required energy. what is an end product that will build up in the person’s muscles?
options:

• lactic acid
• pyruvate
• glucose
• ethyl alcohol

Explanation:

During strenuous exercise, when there is a temporary shortage of oxygen, anaerobic respiration occurs in muscle cells. In humans, the end - product of anaerobic respiration in muscle cells is lactic acid. Glucose is first broken down into pyruvate through glycolysis (a common step in both aerobic and anaerobic respiration). Then, in the absence of sufficient oxygen, pyruvate is converted into lactic acid. Ethanol is a product of anaerobic respiration in some microorganisms (like yeast), not in human muscle cells. Glucose is the starting material for respiration (both aerobic and anaerobic in muscle cells here, but it is not the end - product that builds up. Pyruvate is an intermediate in the process of respiration (in both aerobic and anaerobic pathways in muscle cells, but it is not the end - product that accumulates during anaerobic respiration in muscle cells).

Answer:

lactic acid