July 7, 2021
If you leave a sample of blood to stand it separates into 2 parts:
- Plasma – mainly water with chemicals dissolved in it:
- Food (sugars, amino acids, vitamins and minerals)
- Chemical waste like urea
- Blood proteins like antibodies
- Hormones
2. 3 types of blood cell
- Red blood cells
- White blood cells
- Platelets
Red Blood Cells
- No nucleus
- Hollow disc shape allows them to absorb a lot of oxygen
- Haemoglobin is a protein containing iron (makes blood red)
- Combines with oxygen to produce ---> oxyhaemoglobin
White Blood Cells
- Fight disease
- A lot fewer than red blood cells
- No nucleus
- Made in the bone marrow
- Protect the body from pathogens
- 2 types of white blood cells
Lymphocytes
- Make chemicals called antibodies
- They attack pathogens in different ways; make them stick together, dissolve them, destroy the toxins the pathogens make.
- After you have a disease the antibodies stay in your blood and make you immune to that disease.
Phagocytes
- 'cell-enter'
- They ‘engulf’ or swallow up the pathogens and take them into the cell
- They digest and kill them
That's the end of today's topic!
Drafted by Yoshi (Biology)
Photo reference:
1. https://www.google.com/url?sa=i&url=https%3A%2F%2Fbiology-igcse.weebly.com%2Fblood-cells---structure-and-functions.html&psig=AOvVaw3f2RU0Z811o0lht1ANpGiJ&ust=1625032756846000&source=images&cd=vfe&ved=0CAoQjRxqFwoTCKjs8vWUvPECFQAAAAAdAAAAABAD
2. https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.medicalnewstoday.com%2Farticles%2F315133&psig=AOvVaw2okCh2EpI_V2alWLVwTj6L&ust=1625033042842000&source=images&cd=vfe&ved=0CAoQjRxqFwoTCJDb8YOWvPECFQAAAAAdAAAAABAD
3.