Question

oxygen and carbon dioxide are exchanged at the cellular level. oxygen leaves the bloodstream and is delivered to the tissue cells, where it is used for energy. in which system does this occur:
a pulmonary respiration
b external respiration
c internal respiration
d broncho respiration

Explanation:

To solve this, we analyze each option:

• Option A: Pulmonary respiration involves gas exchange in the lungs (between alveoli and blood), not at the cellular level.
• Option B: External respiration is the gas exchange between the environment and the lungs (or respiratory surface), not at the tissue - cell level.
• Option C: Internal respiration is the gas exchange between the blood and the tissue cells. Oxygen from the blood is delivered to tissue cells for energy production, and carbon dioxide from cells enters the blood. This matches the described process.
• Option D: Broncho - respiration is not a standard term for this type of gas exchange at the cellular level.

Answer:

C. internal respiration