a.k.a cardiovascular system
3 parts:1. heart2. blood3. blood vessels
Double Circulation:1. systemic circuit – blood leaves heart and
tours body2. pulmonary circuit – blood leaves heart to
go to lungs and back to heart
Systemic Circuit Tour
1. Oxygenated blood leaves left ventricle via aortic semilunar valve & enters the aorta, the largest artery in the body
Systemic Circuit Tour
2. Aorta branches into arteries1. coronary arteries –
supply O2 to heart
2. ascending arteries – supply O2 to head & arms
3. descending arteries – supply O2 to abdominal
organs and legs
“Away, thick”
Systemic Circuit Tour
3. Arteries arterioles capillaries
Get smaller & smaller
Capillaries:Where exchange of gases,nutrients, hormones, & wasteoccurs
After exchange, blood is deoxygenated & needs to go to lungs, but first must go to heart.
Capillaries venules veins
Get larger and larger
Toward, thin
Systemic Circuit Tour
4. Blood from superior body parts enters right atrium through superior vena cava
Blood from inferior body parts enters right atrium through inferior vena cava
Systemic Circuit Tour
5. Blood moves from right atrium to right ventricle through the right atrioventricular valve (tricuspid)
Pulmonary Circuit Tour
6. From right ventricle blood goes out again through pulmonary semilunar valve and enters pulmonary artery
-Carries deoxygenated blood to lungs-Branches into left and right pulmonary arteries
- Arteries arterioles capillaries in alveoli
Pulmonary Circuit Tour
7. Blood enters back into heart via pulmonary veins into left atrium
Pulmonary Circuit Tour
8. Blood moves from left atrium to left ventricle through left atrioventricular valve (bicuspid, mitral)
Recap of Systemic Circuit:
› Blood leaves heart’s left ventricle via aorta › It travels through arteries arterioles capillaries
of heart & superior/inferior body parts › Gas, nutrient/waste exchange occur between blood &
tissues through capillary walls› Deox. blood leaves capillaries venules veins› It enters into heart’s right atrium via
superior/inferior vena cava › it flows into hearts right ventricle via right
atrioventricular valve (tricuspid)
Recap of Pulmonary Circuit:› Deox. blood leaves heart’s right ventricle via
pulmonary artery › Artery branches right & left into each lung› Blood travels from arteries arterioles
capillaries of alveoli› Gas exchange occurs at alveoli› Oxygenated blood returns to heart’s left atrium
through pulmonary veins› It flows into left ventricle through the left
atrioventricular valve (bicuspid, mitral)