The Circulatory System Flashcards
Closed system means ?
Blood stays inside the blood vessels
Open system means ?
Blood leaves the blood vessel
Why are close systems better
They pump blood around the body faster
What are the 3 types of blood vessels
Artery
Vein
Capillary
The characteristics of an artery
Thick wall
No valves
High pressure
Oxygenated blood
Characteristics of veins
Thin walls
Valves
Deoxygenated blood
What do valves do
Prevent back flow
What does the hepatic portal vein connect
The liver to the small intestine
How is a heart beat created
The valves in the heart closing
How is a pulse created
The expansion of an artery caused by pumping of heart
How is blood pressure created
Force required to stop blood flow in an artery
Stages of heartbeat
Cardiac muscle COntract- SYstole
Cardiac muscle RElax-Diastole
