function of the heart heart sounds and blood pressure
TRANSCRIPT
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FUNCTION OF THE HEARTHeart Sounds and Blood Pressure
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Terms:• Systole – Contraction of the myocardium
• Diastole – Relaxation of the myocardium
• Should already know: atria, ventricle, atrioventricular valve, aorta.
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Process/Sounds of the Heart
1. Atrial systole (contraction) sends blood into the ventricles.
2. The ventricles fill which causes the atrioventricular valves to start closing.
3. Atrial diastole (relaxation).
4. Ventricular systole injects blood into the aorta or pulmonary artery.
5. AV-valves slam shut (“Lubb” sound)
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Process/Sounds of the Heart
6. Back pressure in the aorta or pulmonary trunk builds up.
7. The aortic valve and pulmonary valve slam shut (“Dupp” sound)
8. Ventricular diastole.
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Contraction Process
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Listen to Heart Sounds• Listen to your partner’s heart sounds.• Should hear lubb-dubb, lubb-dubb.• If a valve does not close all the way, it is called a murmur.
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Regulation of Cardiac Output
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Blood Pressure Facts• The human heart creates enough pressure to squirt blood
30 ft.
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Blood Pressure· Measurements by health professionals
are made on the pressure in large arteries
· Systolic – pressure at the peak of ventricular contraction
· Diastolic – pressure when ventricles relax
· Pressure in blood vessels decreases as the distance away from the heart increases
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Measuring Arterial Blood Pressure
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Slide 11.39a
Blood Pressure: Effects of Factors
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Neural factors· Autonomic nervous system adjustments
(sympathetic division)· Renal factors
· Regulation by altering blood volume· Renin – hormonal control
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Slide 11.39b
Blood Pressure: Effects of Factors
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Temperature· Heat has a vasodilation effect
· Cold has a vasoconstricting effect
· Chemicals· Various substances can cause increases or
decreases
· Diet
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Variations in Blood Pressure
Slide 11.41Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
· Human normal range is variable· Normal· 140–110 mm Hg systolic· 80–75 mm Hg diastolic
· Hypotension· Low systolic (below 110 mm HG)· Often associated with illness
· Hypertension· High systolic (above 140 mm HG)· Can be dangerous if it is chronic