Intro to the Circulatory System | Biology | Physiology | FuseSchool


the circulatory system works to

transport oxygen and nutrients to cells

in your body while removing waste

products such as carbon dioxide at the

same time hemoglobin which is the

protein present in red blood cells

serves as the main transporter much like

a school bus with oxygen and carbon

dioxide being able to hop on or hop off

at the correct destinations the system

is actually a double circulatory system

made of two circuits the pulmonary

circuit and the systemic circuit in the

pulmonary circuit deoxygenated blood is

pumped from your heart to your lungs to

become oxygenated in the systemic

circuit this oxygenated blood that is

returned to the heart is pumped to the

rest of your body

unlike other muscles in your body your

heart never tires and works very hard to

ensure that blood reaches all parts from

your head to your toes blood is pumped

away through the aorta and then through

the arteries arteries have very thick

muscular walls so to withstand the

pressure of very fast flowing blood

these arteries branch into smaller

arterioles which then branch into

smaller capillaries that surround all

cells the movement of blood slows down

significantly at the capillaries for two

reasons the capillaries are much much

smaller and slower movement allows for

gas exchange here oxygen is offloaded

onto cells so blood becomes deoxygenated

and carbon dioxide and other waste

products are picked up the oxygenated

blood then travels away from the

capillaries into the venules and then

into the veins

unlike arteries veins have much thinner

walls and valves that prevent

deoxygenated blood from flowing

backwards the Steve oxygenated blood

doesn't travel straight to the lungs to

become oxygenated it must first travel

to the heart so it can be pumped into

the lungs

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