From 9ee8c77157764c49ed981fdbf588df44daffdcad Mon Sep 17 00:00:00 2001 From: Bailey Burnette Date: Fri, 12 Sep 2025 19:19:39 +0200 Subject: [PATCH] Update '11.Three Circulatory and Respiratory Systems - Concepts Of Biology - 1st Canadian Edition' --- ...Systems---Concepts-Of-Biology---1st-Canadian-Edition.md | 7 +++++++ 1 file changed, 7 insertions(+) create mode 100644 11.Three-Circulatory-and-Respiratory-Systems---Concepts-Of-Biology---1st-Canadian-Edition.md diff --git a/11.Three-Circulatory-and-Respiratory-Systems---Concepts-Of-Biology---1st-Canadian-Edition.md b/11.Three-Circulatory-and-Respiratory-Systems---Concepts-Of-Biology---1st-Canadian-Edition.md new file mode 100644 index 0000000..9074ee6 --- /dev/null +++ b/11.Three-Circulatory-and-Respiratory-Systems---Concepts-Of-Biology---1st-Canadian-Edition.md @@ -0,0 +1,7 @@ +
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The final bronchioles are the respiratory bronchioles. Alveolar ducts are attached to the top of every respiratory bronchiole. At the end of every duct are alveolar sacs, each containing 20 to 30 alveoli. Gas change occurs solely in the alveoli. The alveoli are thin-walled and appear like tiny bubbles within the sacs. The alveoli are in direct contact with capillaries of the circulatory system. Such intimate contact ensures that oxygen will diffuse from the alveoli into the blood. In addition, carbon dioxide will diffuse from the blood into the alveoli to be exhaled. The anatomical arrangement of capillaries and alveoli emphasizes the structural and purposeful relationship of the respiratory and circulatory methods. Estimates for the surface area of alveoli within the lungs range around a hundred m2. This large area is about the area of half a tennis courtroom. This giant floor area, combined with the skinny-walled nature of the alveolar cells, permits gases to easily diffuse across the cells. The primary function of the respiratory system is to ship oxygen to the cells of the body’s tissues and remove carbon dioxide, a cell waste product.
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