2.6 Blood clotting

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

2.6 Blood clotting

GOALS

- you can explain how your blood clots and forms a scab.  

- You can name all the substances that are necessary for blood clotting.

- you can explain what haemophila is.

covered text (first thought and making a clot)

When you hurt yourself you start to bleed. The blood dries and forms a scab.

When a bloodvessel is damaged they release chemicals

These chemicals call platelets to the wound, which stick to it.

Then the platelets send chemical signals to the substance fibrinogen in your blood.

Fibrinogen changes into sticky threads called fibrin

Together these molecules form a net and trap red bloodcells, plasma and platelets.

This network is called a clot.

The clot will harden and form a scab.

Underneath your cells can heal.

explain in your own words how your skin forms a scab when you cut yourself.

Blood clotting

• platelets (small cell fragments)
  
  

Blood plasma has a lot of proteins in it. which one is important for blood clotting?

What is the function of platelets?

1. Heal the wound after other cells stopped the bleeding
2. Let the wound stop bleeding by clotting and covering it
3. Send signals to the blood vessels if they are broken
4. Make sure the blood flows to the wound

Haemophilia

• Person cannot make the chemicals involved in blood clotting
• This person can bleed to death easily

assignment

Watch the video in the next slide.

Write down in your own words:

- what is haemophilia?

- explain (in simple words) what goes wrong when you have haemophilia.

What is haemophilia?

explain what goes wrong when you have haemophilia

homework

study 2.6

do excercises 46,48,49,50