Blood & Circulation

Red Blood Cells
1. Contain no nucleus (doesn't have a dip in the centre)> more oxygen carried
2. Large surface area compared to volume > oxygen close to surface
Platelets
1. Platelets clot the blood after a wound > prevents infection and blood loss
2. People with haemophilia have a faulty gene that codes for the clotting process
White Blood Cells
1. Larger than red blood cells, flexible shape to help engulf disease organism
2. Protects against infection by digesting harmful microbes, bacteria digested inside WBC
3. Able to squeeze out of capillaries to defend different tissues
4. Has a dip in the centre and has a nucleus
Plasma
1. Contains mostly water, dissolved food, urea, hormones and carbon dioxide
2. Pale yellow fluid carries blood cells, useful and waste substances around the body through blood vessels
Arteries = Away
1. Arteries have thick walls because the blood pressure is very high. They also have thick elastic walls
veINs = IN
Capillaries = Small cells
Valves = Open and close to let blood through and to prevent back flow
Heart is made out of muscle
Capillaries take blood to small cells
The heart has a double circulation, meaning blood can be pumped to the lungs and body at the same time
Pulmonary Artery > Carries blood from the heart to the lungs
Aorta (Artery) > Carries blood from heart to body
Pulmonary Vein > Carries blood from lung to heart
Vena Cava (Vein) > Carries blood from body to heart

Resource summary

	Created by Scott Church almost 12 years ago