Bloods Circulations
There are 3 different types of blood vessels:
1. Arteries
- Thick muscular walls to withstand high blood pressure
- Transport blood from the hearts to all parts of the bodies
- Blood flows under high speed and pressure
2. Veins
- Thin muscular walls because blood pressure is low
- Transport blood back to the heart
- Blood flows slow and low pressure
3. Capillaries
- Connect artery and vein
- Allows exchange of materials between blood and body cells
- One cell thick wall
- Blood flows very slow and very low pressure
Bloods Types
There are 3 different types bloods which are: red blood cell, white blood cell and platelets
Red blood cells
-
Have no nucleus
Have biconcave shape to increase surface area of red blood cell
Carry oxygen and transport to all parts of the body
White blood cells
-
Have nucleus
Destroy micro-organisms to protect body from infection
Change body shapes to engulf foreign microorganisms
Platelets
-
Small purple blood object that gathers together around damaged area to clot blood and
prevent bleeding
Blood plasma
-
Carries nutrients, hormone, waste to the parts of the body that needs it
Bloods Disease
Anaemia
-
A condition where the number of red blood cells is less than normal in a person
Get tired easily and suffers constants headache (pale skin, cold hand and feet)
Lack of red blood cells causes less oxygen transported to the whole body
Sickle-cell disease
-
This disease causes abnormal red blood cells in the human body
The shape of the red blood cell is sickle-shaped and not normal biconcave shape
Sickle-shaped red blood cell has lesser surface area and has lesser oxygen