Nutrition is the process by which the body breaks down substances and gets energy from food.
Increasing the number of capillaries associated with alveoli would be expected to increase carbon dioxide being carried to alveoli.
Alveoli are the very small air sacs at the end of the bronchioles. Each alveolus is cup-shaped with thin walls, and It is surrounded by networks of blood vessels which are called as capillaries that also have very thin walls. The oxygen we breathe gets into the blood through the alveoli and capillaries. The Red blood cells travel through the capillaries. Alveoli's walls share a membrane with the capillaries. Oxygen and carbon dioxide get in and move freely between the human respiratory system and the bloodstream.
Oxygen molecules are attached to red blood cells, which travel back to the heart, and at the same time, carbon dioxide molecules in the alveoli get out of the body.
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Microtubules are hollow tubes of protein that maintain cell shape and permit movement of cell organelles.
Nitrogen-fixing bacteria are microorganisms present in the soil or in plant roots that change nitrogen gases from the atmosphere into solid nitrogen compounds that plants can use in the soil.
the immune system is the body system that fights infection's my friend
