B7.2
- Created by: Fathima Mohamed
- Created on: 18-04-15 19:39
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- Biology B7.2
- Humans have a double circulatory system. This means that blood is pumped around two loops around the body and the lungs.
- Blood carries glucose molecules and oxygen to the muscle.
- It them carries waste products (eg: carbon dioxide and urea) away from the muscles.
- Blood carries glucose molecules and oxygen to the muscle.
- Components of blood.
- Red blood cells : They transport oxygen.
- White blood cells: they fight infections. They can kill them or engulf them.
- Plasma: it is the liquid part that transports nutrients, antibodies, Hormones and waste.
- Red Blood Cells are adapted to their function.
- They are packed with haemoglobin to bind with oxygen. They have no nucleus so there is more space for haemoglobin. It has a biconcave shape to increase surface area for oxygen exchange.
- The main structures of the circulatory system the blood passes through are : Pulmonary Vein, Left atrium, Left ventricle Aorta, Vena cava, Right atrium, right ventricle, Pulmonary artery.
- There are vales in the heart and veins to stop blood from flowing backwards.
- Tissue Fluid Formation
- When blood flows into the capillary beds it is under high pressure
- Plasma is forced into tissues at high pressure
- Oxygen and glucose diffuse from the fluid into cells
- Plasma is forced into tissues at high pressure
- When blood flows into the capillary beds it is under high pressure
- Humans have a double circulatory system. This means that blood is pumped around two loops around the body and the lungs.
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