Ch. 9-Cardiovascular System Flashcards Preview

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Flashcards in Ch. 9-Cardiovascular System Deck (148)
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What does the cardiovascular system do?

Circulates blood by action of the heart, provides cells with oxygen and nutritive elements and removes waste and carbon dioxide

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How many times does the heart beat each day?

100,000; 8,000 liters of blood

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Where does blood flow?

Through the heart to the lungs, then back to the heart and out of the body

3

Heart

Center of cardiovascular system where vessels originate and return, weighs 300g, circulates blood through lungs and body

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Pulmonary circulation

Lung circulation

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Systemic circulation

Circulation through the rest of the body

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3 Layers if the Heart

Endocardium, myocardium, pericardium

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Endocardium

Inner lining of the heart

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Myocardium

Muscular middle layer of heart

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Pericardium

Outer membranous sac surrounding the heart

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Arteries

Branching systems of vessels that transport blood from the right and left ventricles to all body parts
They always have a pulse

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Veins

Transport blood from tissues back to the heart

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Capillaries

Microscopic blood vessels connecting arterioles with venules
-passage of life sustaining fluids containing oxygen and nutrients

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Blood

Consists of formed elements (erythrocytes, thrombocytes, leukocytes) and plasma
-delivers necessary substances to cells and transports waste

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Septum

Divides heart into sections called the right and left heart

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Atria

Two upper chambers, separated by interatrial septum, designated as right or left depending on which side of the septum they are on. They receive blood from the body

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Ventricles

Two lower chambers, separated by interventricular septum, designated as right or left depending on which side of the septum they are on. Pump blood out to body

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Right atrium

RA
Receives blood from body. Superior and inferior vena cava bring deoxygenated blood here, fills atrium, then passes through tricuspid valve to the right ventricle

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Right ventricle

RV
Receives blood from right atrium through tricuspid valve, contracts to force blood through pulmonary valve into left and right pulmonary arteries, which then carry it to the lungs where it is oxygenated

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Pulmonary arteries

Only artery that carries oxygen-deficient blood

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Left atrium

LA
Receives blood from left and right pulmonary veins from lungs, fills atrium and creates pressure that forces oxygenated blood through the mitral (bicuspid) valve and into left ventricle

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Left ventricle

LV
Receives blood from left atrium through mitral valve, contracts when filled, closing the mitral valve and opening the aortic valve. The blood is pumped from the aorta all over the body through arteries and capillaries

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Tricuspid valve

Right atrioventricular valve
Guards opening between right atrium and right ventricle

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Pulmonary valve

Semilunar valve
Guards opening between right ventricle and pulmonary artery

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Mitral valve

Bicuspid valve
Left atrioventricular valve
Between left atrium and left ventricle

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Aortic valve

Semilunar valve
Between left ventricle and aorta

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Coronary arteries

Part of hearts own vascular system that delivers oxygen rich blood to the heart

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Cardiac veins

Part of hearts own vascular system that collects oxygen poor blood and returns it to the right atrium

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Heartbeat

Controlled by autonomic nervous system and generated by specialized neuromuscular tissue that causes cardiac muscle to contract

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3 Things in Heart's Specialized Neuromuscular Tissue

Sinoatrial node, atrioventricular node, and atrioventricular bundle