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Murrr4er [49]
4 years ago
11

11)

Biology
2 answers:
Nikitich [7]4 years ago
7 0

Explanation:

<h3>Question:-</h3>

When people run long distances, their muscles require increased amounts of oxygen. Which system is responsible for carrying this oxygen to the muscles?

<h3>Answer:-</h3>

Respiratory System.

Did you Know?

Haemoglobin is the pigment of our blood to give red color.

Hope it helps ☃️

elena55 [62]4 years ago
4 0
D) Circulatory. The circulatory system delivers oxygen and nutrients to all cells in the body, including muscle cells.
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