BS 1 - Blood

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

Today's lesson

Discussion of test ch2

Start ch3: the circulatory system

1. What is the circulatory system?

What does circulation mean? Ex. A teacher circulates the room answering the students questions.

1. To move around.
2. To move in a circle.
3. To move backwards.
4. To move up and down.

The circulatory system

A system of tubes that moves substances around your body. 

The heart muscle powers this movement.

What moves around in your body via the circulatory system?

1. cells, tissues, organs
2. eyes, ears, stomach
3. blood, food, oxygen
4. blood, nutrients, oxygen, CO2

Blood - What comes to mind?

What do we know already?

• Unit 1: Blood carries oxygen & CO2
• Unit 2: Blood carries nutrients

Worktime

Read 3.1 Blood

Make assignment 1 -4 and 6 - 9

Blood

• Function: Blood transports everything your body needs
• Ex. heat, nutrients, oxygen, CO2, waste products

• Blood contains:

1. Plasma: plasma proteins (ex. fibrinogen), water, dissolved substances 
2. Solids: red and white blood cells, platelets

What is blood?

Red blood cells

• small round discs
• no nucleus
• red pigment: haemoglobin
• Function: absorb and release oxygen

White blood cells

Function: Destroy pathogens (bacteria) 

Do have a nucleus

No fixed shape

Can squeeze through openings

extra: Pus: Dead WBC and the bacteria they killed

Platelets

• Not cells 
• broken parts of cells
• Function: clotting 

Clotting inside blood vessels is called thrombosis

What is the function of the red blood cell (RBC)?

Why do we have white blood cells?

1. To protect us from suffocating
2. To protect us from bleeding out
3. To protect us from the cold
4. To protect us from pathogens

Recap - what was the lesson about?

1. The circulatory system

2. Blood and it's parts

         - red blood cells

         - blood plasma

         - white blood cells

What did you learn today?

What questions do you still have about blood?

HW: Read 3.1 Blood

Do Qs 1 t/m 7