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Summary Mastering Biology notes on Chapter 43 Circulatory System $6.39
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Summary Mastering Biology notes on Chapter 43 Circulatory System

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This document includes: open and closed system, double circulation, pulmonary and systemic, oxygenated blood, the human heart, vena cava, cardiac cycle, diastole and systole, atrioventricular valves, semi-lunar valves, sinoatrial and atrioventricular nodes, fish gills, cellular respiration, hemoglo...

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  • August 20, 2024
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  • 2023/2024
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Chapter 43 The Circulatory System


Insects, open circulatory system
Vertebrates, closed circulatory system




Double circulation
1. Pulmonary circuit: passes through lungs. Low pressure
2. Systemic circulation: goes to body tissues. High pressure
Right side of heart: deoxygenated => goes to lungs
Left side of heart: oxygenated => goes to tissues
Necessary for decrease in blood pressure as blood moves through the lungs




- Deoxygenated blood: Vena cava => Right atrium => (Bicuspid valve) => Right ventricle
=> Pulmonary artery => (Pulmonary valve)
- Lungs
- Oxygenated blood: Pulmonary vein => Left atrium => (Tricuspid valve) => Left
ventricle => Aorta => (Aortic valve)
- Body tissues

, Cardiac cycle: one complete diastole and one complete systole. Less than 1 sec
- Diastole: relaxed. Blood flows into atria when atria and ventricles are relaxed, then
both atria contract simultaneously. Lowest pressure
- Systole: both ventricles contract simultaneously. Peak pressure
Systole
C ardiac cycle=
Diastole
Superior and inferior vena cava




Atrioventricular valves:
- Bicuspid: right side of heart
- Tricuspid: left side of heart
Semi-lunar valves
- Pulmonary valve: Pulmonary artery
- Aortic valve: Aorta

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