Blood

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 2

Welcome!

New chapter: the circulatory system

Discussing paragraph 3.1 (p. 176)

Making exercises

Which organ absorbs oxygen and secretes carbondioxide?

Which organ absorbs nutrients?

What do we need and what is released during respiration?

The circulatory system 

What are we going to learn today?

Today we will learn:

What blood is. 

What blood consists of and what all these parts do. 

Blood

An average human has 5 liters of blood, that circulates your whole body in less than 30 seconds. It's function is to transport essential substances and waste product through your body. 

Blood

Blood is a mix of water and solid parts. 55% is solid, and 45% is blood plasma: water with important substances dissolved in it. 

Red blood cells

Red blood cells are very tiny ''discs'' in your blood. Their main function is to transport oxygen and carbondioxide. Because of that, they have a protein called haemoglobin which has iron in it. 

White blood cells

White bloods cells are also common in your blood, but they can also leave the circulatory system. That is because white blood cells are a very important part of your immune system: the system that looks for pathogens and destroys them. 

Platelets

When you have an injury, blood flows out of your veins. This needs to be fixed as quickly as possible. Your platelets are responsible for this. When they make contact with air, they release fibers that clot together. Making a fiber that holds everything in your body. 

Blood

Time to work

You can work on the exercises of paragraph 3.1, you don't need to make the summary, but do make exercise 9.