ANATOMY

Detailed explanation-1: -Capillaries are the simplest blood vessels. They are the smallest of the body’s blood vessels. The major function of capillaries is the exchange of gases and nutrients between blood and tissues.

Detailed explanation-2: -4. Exchange of Gases, Nutrients, and Waste Between Blood and Tissue Occurs in the Capillaries. Capillaries are tiny vessels that branch out from arterioles to form networks around body cells. In the lungs, capillaries absorb oxygen from inhaled air into the bloodstream and release carbon dioxide for exhalation.

Detailed explanation-3: -Things like water, proteins, hormones, nutrients (glucose, etc), waste products (ammonia), gases (oxygen, carbon dioxide), electrolytes, etc must all be readily exchanged across our capillaries. Most of these things are dissolved in our blood plasma. How exactly do they move across wall of the capillaries?

Detailed explanation-4: -Exchange of molecules Glucose diffuses from the blood plasma, across the capillary walls to the tissue fluid, and then to the cells.

Detailed explanation-5: -Gas Exchange Between Alveolar Spaces and Capillaries The function of the respiratory system is to move two gases: oxygen and carbon dioxide. Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them.