Circulatory system - Blood Flashcards
1
Q
Red blood cells
A
carry oxygen
2
Q
White blood cells
A
defend against infection
3
Q
Platelets
A
helps blood clots
4
Q
Plasma
A
carries everything
5
Q
Describe red blood cells
A
- biconcave disc shape to absorbs more oxygen
- contains red pigment called haemoglobin
- dont have a nucleus
- haemoglobin + oxygen = oxyhaemoglobin (in the lungs)
- oxyhaemoglobin - oxygen = haemoglobin and oxygen (in body tissue)
6
Q
Describe white blood cells
A
-they have a nucleus
7
Q
Describe platelets
A
- small fragments of cells
- no nucleus
- they stop blood pouring out and microorganisms getting in a wound
- lack of it causes bleeding and bruises
8
Q
Describe plasma
A
contains:
- red and white blood cells and platelets
- CO2, glucose and amino acids
