Circulatory System
Circulatory System: Circulates the blood
Circulatory System: Circulates the blood which carries the O 2 to cells
Heart Made of cardiac muscle, hollow, about the size of a clenched fist Contracts ~72 times/min In 1 day, the heart pumps 1800 liters. That is enough blood to fill an Olympic-sized swimming pool in a year.
FYI Newborn heart rate=140 beats/min First heart transplant-1967 By 1995 90% success rate for heart transplants The heart may beat for several minutes after it is removed from the body
The inside of the heart Septum:
The inside of the heart Septum: (1) divides the heart in half right and left side Atrium:
The inside of the heart Septum: (1) divides the heart in half right and left side Atrium: (2) The upper chambers that receive the blood Ventricle:
The inside of the heart Septum: (1) divides the heart in half right and left side Atrium: (2) The upper chambers that receive the blood Ventricles: (2) The lower chambers which pump blood out of the heart
- Chordae tendinae: connect to the valve - Papillary muscle: tug on the chordae tendinae
- Chordae tendinae: connect to Both work together the valve to open the valves - Papillary muscle: tug on the chordae tendinae
The inside of the heart Valve: Septum: (1) divides the heart in half right and left side Atrium: (2) The upper chambers that receive the blood Ventricle: (2) The lower chambers which pumps blood out of the heart
The inside of the heart Septum: (1) divides the heart in half right and left side Atrium: (2) The upper chambers that receive the blood Ventricle: (2) The lower chambers which pumps blood out of the Valve: (4) one way opening heart
The inside of the heart Septum: (1) divides the heart in half right and left side Atrium: (2) The upper chambers that receive the blood Ventricle: (2) The lower chambers which pumps blood out of the heart
Valve: Heart has 4 valves Tricuspid valve: between right atrium and right ventricle Pulmonary valve: between right ventricle and pulmonary artery
Valve: Heart has 4 valves Mitral valve or Bicuspid valve: between left atrium and left ventricle Aortic valve: between left ventricle and the aorta
The inside of the heart
On a picture: Oxygenated blood is red Deoxygenated blood is blue (deoxiginated means it is carrying CO 2 )
The pathway of drop of blood: 1. vena cava (superior/inferior) 2. right atrium 3. right ventricle 4. pulmonary arteries (right and left) 5. capillaries in the lungs 6. pulmonary veins (right and left) 7. left atrium 8. left ventricle 9. aorta 10. body
The pathway of drop of blood: 1. vena cava (superior/inferior) 2. right atrium 3. right ventricle 4. pulmonary arteries (right and left) 5. capillaries in the lungs 6. pulmonary veins (right and left) 7. left atrium 8. left ventricle 9. aorta 10. body (and heart through coronary arteries)
Coronary arteries: give the heart it s own O 2 Fatty tissue: for protection
Respiratory and Circulatory: So WHY are we doing the respiratory system and the circulatory system in the same unit?
Arteries, Veins and Capillaries
Arteries Carry blood AWAY from the heart Carry oxygenated blood (except for ) Has thick muscle layer
Arteries Carry blood AWAY from the heart Carry oxygenated blood (except for ) Has thick muscle layer (smooth muscle)
Veins ALWAYS Return blood TO the heart Carry deoxygenated blood (except for ) Contain one way valves that keep blood flowing back to the heart
Veins Return blood TO the heart Carry deoxygenated blood (except for ) Contain one way valves that keep blood flowing back to the heart
Where there is an there is a.
Where there is an artery there is a vein.
Capillaries Smallest blood vessels Red blood cells go through in single file Walls are only one cell thick
Capillaries Where an artery turns into a vein Exchange of molecules and nutrients happens here
Artery Capillaries Vein
What happens at the capillaries? Artery Capillaries Vein Diffusion!!
Circulation through the body Pulmonary Circulation Blood pumped from heart to lungs Left side of the heart
Circulation through the body Pulmonary Circulation Blood pumped from heart to lungs left side of the heart Systemic Circulation Blood pumped from the heart to the body right side of the heart
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Heart Attack: When the blood supply gets cut off to the coronary arteries
Heart Attack Bad indigestion Squeezing or heavy pressure Nausea and vomiting Left arm pain and/or chest pain
Stroke: Blood clot gets stuck in one of the arteries leading to the brain
Stroke: Blood clot gets stuck in one of the arteries leading to the brain or bleeding in brain Brain cells die from lack of oxygen May cause: paralysis loss of the ability to speak loss of sight sometimes death