Circulatory System - Blood Flashcards Preview

Combined Science AQA Biology B2 GCSE > Circulatory System - Blood > Flashcards

Flashcards in Circulatory System - Blood Deck (12):
1

What is the job of the red blood cells?

to carry oxygen from the lungs to all the cells in the body

2

Why are the red blood cells shaped the way they are?

They are shaped like a biconcave disc as they have a large surface area for absorbing oxygen

3

Why do red blood cells not have a nucleus?

To carry more oxygen

4

What is haemoglobin?

A red pigment that binds to oxygen in the lungs to become oxyhemoglobin, in body tissue the reverse happens it splits up into haemoglobin and oxygen to release oxygen into the cells

5

What do white blood cells do?

defend against infection

6

What is phagocytosis?

When white blood cells change shape and gobble up microorganisms

7

What is produced by white blood cells?

antibodies to fight microorganisms and antitoxins to neutralise toxins

8

What do white blood cells have that red blood cells don't?

a nucleus

9

What do platelets do?

they help the blood to clot.

10

What are platelets?

small fragments of cells which have no nucleus

11

What can a lack of platelets cause?

excessive bleeding and bruising

12

What is plasma?

a pale straw coloured liquid that carries just about everything. such as blood cells glucose carbon dioxide urea hormones proteins and antibodies.