Question

which of the following best describes how the digestive system supports the respiratory sys
a. the digestive system provides water needed by your lungs.

b. they are both told to function by the nervous system.

c. the digestive system provides oxygen needed for the respiratory system.

d. the digestive system provides nutrients needed to fuel the respiratory system.

Explanation:

• Option A: The respiratory system (lungs) gets water mainly from the circulatory system (via blood), not directly from the digestive system. So A is incorrect.
• Option B: The question is about how the digestive system supports the respiratory system. Option B describes control by the nervous system, not support, so B is incorrect.
• Option C: The respiratory system (via lungs) takes in oxygen from the environment, not from the digestive system. So C is incorrect.
• Option D: The digestive system breaks down food into nutrients (like glucose). These nutrients are used by cells of the respiratory system (e.g., lung cells) to produce energy (via cellular respiration), fueling the respiratory system's functions. This correctly describes the support.

Answer:

D. The digestive system provides nutrients needed to fuel the respiratory system.