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What is the 1st step of the systemic circuit?
Oxygenated blood is pumped from the LA to the LV and then into the Aorta.
2nd step of systemic circui.
Blood passes from the Aorta into elastic arteries and then into muscular arteries before entering arterioles.
3rd step in the systemic circuit.
Blood in arterioles enters systemic capillaries for exchange of gases & nutrients.
4th step of the systemic circuit.
De-oxygenated blood exits capillary beds into venules & then into veins.
5th step of the systemic circuit.
Do-oxygenated blood is conducted to either the superior or inferior vena cava & then enters the RA of the heart.
What is the 1st step in the pulmonary circuit.
Step 1: (pulm.)
Blood flows from the RA to the RV and is tehn pumped into the Pulmonary Trunk.
2nd step of pulmonary circuit.
The pulm. trunk conducts deoxygenated blood into pulmonary arteries to the lungs.
3rd step of the pulm. circuit.
The blood passes through smaller & smaller arteries before entering pulmonary caps. for gas exchange.
4th step of the pulm. circuit.
Oxygenated blood exits the lung via a series of larger veins that merge to form the pulm. veins.
5th step of the pulm. circuit.
Pulm. veins drain into the LA.
6th step of pulm. circuit.
Blood enters the LV from the LA.
THE CYCLE REPEATS.
Systemic and Pulmonary Circuits