Because the more someone exerts themselves the more oxygen and carbon dioxide out put ratio is greater. The more you run and the faster you run the more oxygen you loose which is supplied to your muscles including your lungs.
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Answer:
C
Explanation:
The esophagus has an empty lumen with stratified squamous epithelium contacting the lumen and deep to the epithelium is a basement membrane and then two layers of smooth muscle. The esophagus is a long muscular tube that connects the pharynx to the stomach. This structure keeps food and secretions from going going down the windpipe without absorbing the products. It is the least complex section of the digestive tube which plays the role of conveying boluses of food from the pharynx to the stomach. Absorption in the esophagus is virtually absent.
Answer:
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