Circulatory System Flashcards
Inferior Vena Cava
Returns blood from the lower body
Superior Vena Cava
Returns blood from the upper body
Right Atrium
Thin walled chamber that receives deoxygenated blood from the body
Tricuspid Valve
Controls the flow of blood from the right atrium to the right ventricle
(R.A —> R.V)
Right Ventricle
Muscular chamber that pumps blood to the lungs
Pulmonary Valve
controls the flow of blood out to the lungs
(P.A <— Lungs)
Pulmonary Artery
Carries blood to the lungs
Pulmonary veins
blood flows into the heart from the lungs
Left Atrium
Thin walled chamber that receives oxygenated blood from the lungs
Mitral Valve
controls the flow of blood from the left atrium to the left ventricle
(L.A—>L.V)
Left ventricle
Muscular chamber that pumps blood to the body
Aortic valve
controls the flow of blood out of the aorta to the whole body
Aorta
Largest artery that carries blood away from the heart and to all parts of the body
Septum
Wall of muscle that separates the left side of the heart from the right side
(Prevents mixing of oxygenated and deoxygenated blood)
Myocardium
Made up of layers of cardiac muscle
(Contracts by itself)
Oxygenated parts of the heart (6)
Aorta
Left atrium
Pulmonary vein
Left ventricle
Mitral valve
Aortic valve
Deoxygenated parts of the heart (7)
Superior vena cava
Pulmonary artery
Right atrium
Right ventricle
Pulmonary valve
Tricuspid valve
Inferior vena cava
Diastolic pressure
-heart is relaxed
-A.V valves open
-semilunar valves close
-lowest blood pressure
Systolic pressure
-heart is contracted
-A.V valves close
-semilunar valves open
-highest blood pressure
Arteries
-carries blood from the heart
-transports oxygenated blood except pulmonary artery
Veins
-carries blood back towards the heart
-transports deoxygenated blood except pulmonary vein
Capillaries
-Allows material gas exchange between the body cells and the blood
-Connect arteriales and venules
-Pass through in a single file line
-Thin walled and narrow
How is the circulatory system related to the digestive system and respiratory system
-Transports nutrients from digestive system
-Transports oxygen from respiratory system
3 blood vessels that supply oxygen to the heart muscles
Arteries
Veins
Capillaries
What would happen if blood supply to the heart muscles cut off?
You would develop a heart attack or stroke
Why is the heart considered a double pump?
First pump carries deoxygenated blood to your lungs, it then delivers oxygenated blood to the heart
Chordae tendoneae
controls the opening and closing of the heart valves
Differences between arteries and veins
Arteries
-thick elastic wall
-oxygenated blood
-does NOT contain valves
Veins
-thin wall, slightly elastic
-deoxygenated blood
-contains valves
Blood pressure
Force exerted from blood cells against blood vessel walls
Heart (role of the circulatory system)
-Pumps blood through the body
-hollow organ made up of cardiac muscle
Transports of these materials are carried out by
-heart
-blood vessels
-blood
How many chambers does the heart have?
4
Pulse
-A Rhythmic throb that occurs when an artery near the skins surface expands, (blood is flowing through)
-Caused by contractions
Heart murmur
Damaged septum or heart valves
Normal average blood pressure for an adult
120/80
Why does the heart and veins contain valves?
To help the return of blood to the heart
His-Purkije Fibers
Cause ventricles of the heart to contract
Atrioventricular node
Receives electrical impulse
Sinoatrial Node
Sends an electrical impulse to the heart
Coronary arteries
supply blood to the heart muscle
Portal vein circulates blood through the?
liver
Renal vein circulate blood through the
kidneys
Pulmonary veins circulates blood through the
lungs
