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What is the pathway of the blood in the heary and what do they do?
ā³ Vena carva- brings deoxygenated blood to the lungs
ā³ Right atrium
ā³ Right ventricle- pumps blood to the lungs
ā³ Pulmonary artery- takes deoxygenated blood to the lungs
ā³ Lungs
ā³ Pulmonary vein- brings deoxygenated blood from the lungs
ā³ Left atrium
ā³ Left ventricle- pumps blood around the body
ā³ Aorta- carries oxygenated blood to the body
Why is the heart discribed as a double circularory system?
ā³ As it pumps twice for every circuit around the body
What is conary heart disease caused by?
ā³ A build up of fatty material in the conary arteries making them narrow and reducing blood flow
How do you help someone with coronary heart disease?
ā³ Stents to keep the coronary ateries open
How do you help someone with heart failure?
ā³ Artifical hearts before a donor heart becomes availabe for a heart transplant
Why do people with faulty valves feel breathlessness?
ā³ As valves do not fully open making the heart less efficient
How do you help someone with faulty valves?
ā³ Biological valves (animals) or mechanical valves
What does the artery do and what is itās structure?
Function
ā³ Carries blood away from the heart (high pressure)
Structure
ā³ Thick muscular and elastic walls
ā³ The walls can stretch and withstand high pressure
ā³ Small lumen
What does the vein do and what is itās structure?
Function
ā³ Carries blood to the heart (low pressure)
Structure
ā³ Have valves to stop blood flowing the wrong way
ā³ Thin walls
ā³ Large lumen
What does the caillary do and what is itās structure?
Function
ā³ Carries blood to tissues and cells
ā³ Connects arteries and veins
Structure
ā³ One cell thick- short diffusion distance between blood and tissue
ā³ Very narrow lumen
What is the pathway of air in the lungs?
ā³ Into body through mouth/nose
ā³ Down trachea
ā³ Into brochioles
ā³ Into aveoli
ā³ Oxygen diffuses into blood in the network of capillaries over the surface of the aveoli