Question

Question 13
When your body needs more due to increased cellular activity (like during exercise), your
increases to circulate blood faster, delivering more oxygen to cells and removing the
accumulating waste product more efficiently, thereby maintaining the necessary
balance within the body; this is how changes in pulse rate reflect the body's need to
oxygen and carbon dioxide levels. This is considered a feedback
loop because the increased pulse rate acts to counteract the rising carbon dioxide levels and restore the body's
of gases. This helps to maintain .
A)
Cellular respiration is how your cells generate energy. Every cell in the body requires oxygen for
respiration so that sufficient energy can be produced.
Carbon dioxide, a waste product in the process, is also produced and needs to be removed from the
cells.
Therefore, the levels of both gases must be regulated.
How does this explain the changes observed in your pulse rate during the experiment?
(8 points)
 oxygen  pulse rate  carbon dioxide  gas  regulate  negative
 homeostasis  balance

Answer 1

Filled paragraph:
When your body needs more due to increased cellular activity (like during exercise), your pulse rate increases to circulate blood faster, delivering more oxygen to cells and removing the accumulating waste product more efficiently, thereby maintaining the necessary balance within the body; this is how changes in pulse rate reflect the body's need to regulate oxygen and carbon dioxide levels. This is considered a negative loop because the increased pulse rate acts to counteract the rising carbon dioxide levels and restore the body's balance of gases. This helps to maintain homeostasis.

Explanation (8-point logical chain):
1. Exercise raises cellular respiration, so cells consume more oxygen and produce more carbon dioxide.
2. Blood levels of O2 fall and CO2 rise.
3. Chemoreceptors (in the carotid bodies and medulla) detect the change in gas concentrations, especially the rise in CO2 / drop in pH.
4. These receptors send signals to the brainstem (cardiorespiratory centers).
5. The autonomic nervous system responds by increasing heart rate (and breathing rate).
6. The increased pulse rate circulates blood faster, delivering more oxygen to tissues and carrying away CO2 more quickly.
7. As O2 and CO2 levels move back toward normal, the chemoreceptor stimulus decreases.
8. This negative feedback loop restores the balance of gases and maintains homeostasis.