Heart and lungs

Brain and heart

Kidneys and lungs

Platelets

Plasma

Red blood cells

Alveoli have a one cell thick lining for a short diffusion pathway.

Alveoli have a small surface area for fast diffusion of oxygen.

Alveoli have many a thick lining for a long diffusion pathway.

They stick together and make fibres that make scabs (blood clots) that stop pathogens entering the blood or stop you bleeding to death.

They form your immune system and destroy pathogens.

They carry oxygen around the body attached to haemoglobin.

Lymphocytes (red blood cells) and phagocytes and erythrocytes (white blood cells).

Erythrocytes (red blood cells) and phagocytes and lymphocytes (white blood cells).

Phagocyctes (red blood cells) and lymphocytes and erythrocytes (white blood cells).

Engulf (surround) microbes and digest them.

Produce antibodies.

Release a toxin that kills pathogens.

To provide energy for the blood vessel.

To prevent the blood flowing backwards.

To help withstand the high pressure blood, also to contract to control blood flow.

Vena cava, lungs, pulmonary vein, left atrium, left ventricle, aorta, right atrium, right ventricle, pulmonary artery,

Vena cava, left atrium, right ventricle, pulmonary vein lungs, pulmonary artery, right atrium, left ventricle, aorta

Vena cava, right atrium, right ventricle, pulmonary artery, lungs, pulmonary vein, left atrium, left ventricle, aorta

In the arteries, they stop the artery from bursting.

In the heart, and they stop the blood flowing backwards

In the lungs and they are they site of gas exchange

To stop the backflow of blood

To contract to push the blood under high pressure

To cause the pulse

Capillaries

Arteries

Veins

For creating glucose and oxygen

For respiration

For movement (muscle contraction) and keeping warm.

Glucose + carbon dioxide --> oxygen + water

Glucose --> lactic acid

glucose + oxygen --> carbon dioxide + water

Anaerobic respiration takes place in mitochondria, releases less energy and forms lactic acid that causes cramp. Aerobic respiration occurs in cytoplasm, releases more energy and forms carbon dioxide and water which do not cause cramp.

Anaerobic respiration takes place in cytoplasm, releases less energy and forms lactic acid that causes cramp. Aerobic respiration occurs in mitochondria, releases more energy and forms carbon dioxide and water which do not cause cramp.

Anaerobic respiration takes place in cytoplasm, releases less energy and does not cause cramp. Aerobic respiration occurs in mitochondria, releases more energy and causes cramp.