Anatomy Chapter 18
Terms
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- The heart pumps continously about how many beats per minute? year?
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70-80 bpmm
42,000,000 bpy - Where is the heart? how much does it weigh?
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Behind the sternum centered slightly to the left.
Less than 1 pound. - What is a person's theoretical Max heart rate?
- 220 - Age
- The outermost covering of the heart?
- Epicardium
- The muscle layer that does the actual contracting?
- Myocardium
- The internal ENDOTHELIAL tissue that allows blood to flow and PREVENTS LEAKS.
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Endocardium.
(Endothelial tissue) - What is the pericardium?
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3 layers (fibrous pericardium, parietal pericardium, visceral pericardium)
The visceral pericardium is the EPICARDIUM.
The parietal pericardium= connects the fibrous pericardium superficial to it to the deeper visceral pericardium - what are the two cycles of the circulatory system?
- Systemic cycle and pulmonary cycle
- The right atrium collects ___________ blood from 3 veins called...
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Deoxygenated blood from the systemic cicrcuit.
1.) Superior Vena Cava
2.) Inferior Vena Cava
3.) Coronary sinus - The right ventricle recoeves blood from the _____________ and pumps it to the ______________ via the ____________.
- right atrium; pulmonary circuit; pulmonary trunk
- The left ventricle recieves ____________ blood and passes blood to the _______________ through the _________.
- oxygenated; right left ventricle; mitral (bicuspid valve)
- the left ventricle forms the __________ of the heart. It pumps blood up and out to the body through the _____.
- apex; aorta
- What are the four valves in the heart? what movement do they allow?
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-Right AV valve: from right atrium to right ventricle
-Pulmonary semilunar valve: from right ventricle to the lungs
-Left AV valve: from left atrium to left ventricle
-Aortic semilunar valve- from left ventricle to aorta. - What kind of valves are these? what is thier purpose?
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Check valves;
to not allow blood to travel backward throught the heart. - What is the synchronization of valves?
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AV Valves open simultaneously.
Semilunar valves open simultaneously
Both clases of valves open at differing times. -
Right AV valve
-bicuspid/tricuspid
- when heart relaxes does valve (close/open)
-when heart contracts does valve (close/open) - Tricuspid; open; closed
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Pulmonary semilunar valve
- when heart relaxes does valve (close/open)
-when heart contracts does valve (close/open) - closed; open
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Left AV valve
-bicuspid/tricuspid
- when heart relaxes does valve (close/open)
-when heart contracts does valve (close/open) - bicuspid; open; closed
- what protects the heart from opening to far?
- Chordae tendenae
- Recall that pressure =
- Force/Area
- Waht is normal, high, low blood pressure? What is the units?
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High- 140/100 mmHg
Normal 120/80 mmHg
Low 100/60 mmHg - What is the 1st number of the blood pressure called? what pressure is it measuring?
- Systolic pressure; pressure when the heart is contracted.
- What is important to know about systolic pressure? Which is more important?
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Systolic frequently changes therefore, diastolic pressure is more important.
Diastolic measures basal heart rate. - Blood pressure when the heart is relaxed?
- Diastolic
- The heart makes a characteristic "Lub-Dub" sound. What is the "Lub"? "Dub"?
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Lub= closing of the AV valves
Dub= closing og the semilunar valves. - what is auscultation?
- the sounds of the heart.
- WHAT ARE THE THREE CIRCULATORY ROUTES?
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Systemic- out to the whole body
Pulmonary- segment that goes through the lungs for oxygenation
Coronary- part that oxygenates the tissue of the heart. - Which veins and arteries "MATCH UP" in the coronary cycle?
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-anterior descending artery and great cardiac vein
-posterior descending artery and middle cardiac vein
- marginal artery matches up with the small cardiac vein - what is the largest vein that eventually leads back to the heart?
- Coronary sinus
- the coronary sinus deposits deoxygenated blood back into the ___________________ through the ______________.
- right atrium; "hole to the coronary sinus"
- What is the proper name of a heart attack?
- myocardial infarction.
- What causes a heart attack?
- A thrombus that forms in a coronary artery that cuts oxygen to muscle (myocardial necrosis).
- What happens to the tissue when blood is resupplied?
- Nothing it remains dead.
- Heart attacks are the leading cause of
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mortality and morbidity in the U.S.
(500,000 - 700,000 per year) - When are males at risk? females?
- Men are at risk since the age of 40. Women are less at risk. At age 70 they are about equally likely.
- the space where blood can flow through in vessels is called?
- LUMEN
- What occurs in artheriosclerosis?
- the lumen becomes reduced and pressure rises within the vessel.
- What are ways to prevent/reduce risk for heart attacks?
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-Eat healthy
-Excercise
-Quit smoking - What are surgical procedures against heartattacks?
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Angioplasty- catheter is used to balloon clogged arteries and break apart thrombus.
Bypass surgery- taking a piece of a vein (ussually saphenous vein) and bypassing the clot by connecting a new tube to the heart. - Coronary Artery stent
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usually paired with angioplasty.
A stiff tube placed in vessels to keep them open and made to slowly release anticoagulants and blood thinners. - The heartbeat orginates in the ______________ and (IS/IS NOT) extrinsically controlled.
- heart; IS NOT extrinsically controlled.
- What creates the electrical signal that will contract the heart?
- THE Synoatrial node (SA Node) which resides in the right atrium.
- After the signal from the SA node occurs the signal travels
- down the internodal pathway to the atrioventricular node (AV node) which delays the relay down the interventricular septum.
- Finaly through the interventricular septum the signal passes the
- AV bundle then splits into right and left ventricles and innervates the heart at PERKINJE CELLS.