Multiple Choice
Which process is primarily responsible for the production of \( \mathrm{CO}_2 \) that root hairs release into the soil?
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8. Respiration
Introduction to Cellular Respiration
Multiple Choice
Why do Mary's muscles still feel sore after intense exercise?
A
Because her muscles have run out of glucose and cannot contract.
B
Because oxygen levels in her blood are higher than normal.
C
Because her muscles are producing excess ATP through aerobic respiration.
D
Because lactic acid has accumulated in her muscle cells due to anaerobic respiration.
Verified step by step guidance1
Understand the context: During intense exercise, the body may not be able to supply enough oxygen to the muscles for aerobic respiration, leading to anaerobic respiration.
Recall the process of anaerobic respiration: In the absence of sufficient oxygen, muscle cells convert glucose into energy through glycolysis, producing pyruvate as a byproduct.
Learn what happens to pyruvate: Without oxygen, pyruvate is converted into lactic acid instead of entering the mitochondria for aerobic respiration.
Understand the effects of lactic acid: Lactic acid accumulation in muscle cells lowers the pH, causing discomfort and soreness in the muscles after exercise.
Connect the explanation to the problem: Mary's muscles feel sore because lactic acid has accumulated due to anaerobic respiration during her intense exercise.
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