Question

1. how do different organs within the respiratory system contribute to efficient functioning an

by eliminating waste products from the body.
by producing red blood cells for oxygen transport.
by exchanging oxygen and carbon dioxide in the lungs.
by filtering blood and removing toxins.

Explanation:

• Option 1: Eliminating waste (like urea) is the excretory system’s role (e.g., kidneys), not respiratory.
• Option 2: Red blood cells are produced in bone marrow (hematopoietic system), not respiratory organs.
• Option 3: The respiratory system (lungs, trachea, etc.) facilitates gas exchange: oxygen into blood, carbon dioxide out. This matches its function.
• Option 4: Filtering blood and removing toxins is the urinary system (kidneys) or liver, not respiratory.

Answer:

The correct option is "By exchanging oxygen and carbon dioxide in the lungs." (the third option in the list)