Organising animals and plants

What is the pathway of the blood in the heary and what do they do?

↳ Vena carva- brings deoxygenated blood to the lungs

↳ Right atrium

↳ Right ventricle- pumps blood to the lungs

↳ Pulmonary artery- takes deoxygenated blood to the lungs

↳ Lungs

↳ Pulmonary vein- brings deoxygenated blood from the lungs

↳ Left atrium

↳ Left ventricle- pumps blood around the body

↳ Aorta- carries oxygenated blood to the body

Why is the heart discribed as a double circularory system?

↳ As it pumps twice for every circuit around the body

What is conary heart disease caused by?

↳ 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?

↳ Stents to keep the coronary ateries open

How do you help someone with heart failure?

↳ Artifical hearts before a donor heart becomes availabe for a heart transplant

Why do people with faulty valves feel breathlessness?

↳ As valves do not fully open making the heart less efficient

How do you help someone with faulty valves?

↳ Biological valves (animals) or mechanical valves

What does the artery do and what is it’s structure?

Function

↳ Carries blood away from the heart (high pressure)

Structure

↳ Thick muscular and elastic walls

↳ The walls can stretch and withstand high pressure

↳ Small lumen

What does the vein do and what is it’s structure?

Function

↳ Carries blood to the heart (low pressure)

Structure

↳ Have valves to stop blood flowing the wrong way

↳ Thin walls

↳ Large lumen

What does the caillary do and what is it’s structure?

Function

↳ Carries blood to tissues and cells

↳ Connects arteries and veins

Structure

↳ One cell thick- short diffusion distance between blood and tissue

↳ Very narrow lumen

What is the pathway of air in the lungs?

↳ Into body through mouth/nose

↳ Down trachea

↳ Into brochioles

↳ Into aveoli

↳ Oxygen diffuses into blood in the network of capillaries over the surface of the aveoli