Blood B2.3
- Created by: Revise17
- Created on: 18-05-16 20:40
View mindmap
- The blood
- Mass transport system- transporting materials and heat around the body.
- The composition of blood
- Platelets
- Involved in blood clotting
- When skin is wounded- release chemicals that cause proteins to forma mesh of insoluble fibres across the wound
- platelets and red blood cells also get stuck in the mesh forming a clot that develops into a scab
- plasma
- Straw-coloured liquid that makes up just over half the volume of blood.
- Transports carbon dioxide, digested food, urea, hormones and heat
- Straw-coloured liquid that makes up just over half the volume of blood.
- Red blood cells
- Transport oxygen for aerobic respiration
- Adaptations
- Contain Haemoglobin a red protein that combines with oxygen (oxyhaemoglobin) so that the oxygen can be transported to every cell in the body
- No nucleus so that there is more space available for haemoglobin
- Small and flexible so that they can fit through narrow blood vessels
- Biconcave shape to maximise their surface area for oxygen absorption
- more efficient diffusion because of the large surface area compared with the volume of blood
- Thin cell membranes- this allows oxygen to diffuse through more quickly
- White blood cells
- 25% are lymphocytes that produce antibodies (soluble proteins)
- Ingesting pathogens and producing antibodies
- 70% are phagocytes that ingest and destroy pathogens such as bacteria
- Platelets
Comments
No comments have yet been made