The smallest type of blood vessel is the capillary. Its walls are one cell thick and permeable, for substances to transfer out of the capillary and into the cells (and vice versa).
Its venules
The smallest part of the circulatory system is the capillary. Capillaries are tiny, thin blood vessels that allow for the exchange of oxygen, nutrients, and waste products between the blood and tissues in the body.
These tiny chambers are called alveoli. They are not exclusive to just reptiles, but are part of the circulatory system of all vertebrates.
Because each tiny cell has the same needs for survival that you do.
well clam and squid take different water and tiny and big count
In general we call it a blood vessel. Those which carry blood away from the heart are arteries, those which take it back are veins, and the tiny, thin-walled tubes which are found in the organs and exchange substances with the cells are capillaries.
"Our solar system." The "part of our galaxy" that's in our solar system is the solar system.
The circulatory system affects the other body systems because the circulatory system gives oxygen to the other system. Without the circulatory system the other systems would not work.
a capillary
The circulatory system is responsible for transporting oxygen, nutrients, and hormones throughout the body via blood vessels. The smallest blood vessels, called capillaries, are so tiny that red blood cells can only pass through them in single file.
The circulatory system is necessary in a complex multicellular organism like a human because oxygen must be circulated throughout the body to feed the organs and tissues. The blood also removes waste from the organs and tissues (the exchange of gases takes place during circulation). Tiny vessels must pass near every cell in the body and there are a trillion of them.
Capillary