3.1 3.4 Blood and Blood vessels

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 3

Unit 3: Blood and bloodvessels 

Basics: 3.1 & 3.4

Today's goals

You can name some things which can be found in blood

You know the difference between arteries and veins

Blood

What do we know already?

Unit 1: Blood carries oxygen & CO2

Unit 2: Blood carries nutrients

What is blood?

What is blood?

Two parts: liquid and solid

-Bloodplasm (liquid)

-Solids (Red- and white bloodcells, platelets)

Red blood cells

Main function: Carry oxygen

Red pigment: Haemoglobin, allows them to carry oxygen

Don't have a nucleus

White blood cells

Function: Destroy pathogens

Pus: Dead WBC and the bacteria they killed

Do have a nucleus, don't have a fixed shape

Can squeeze through openings

Platelets

Not cells! Fragments of cells that have broken up

Important in clotting 

Platelets

Not cells! Fragments of cells that have broken up

Important in clotting 

Clotting inside blood vessels is called thrombosis

Where do we find white blood cells?

1. Blood plasma
2. Solid part of the blood

Where do we find salts?

1. Paletelets
2. Solid part of the blood
3. Blood plasma
4. Neither, salt cannot be found in the blood

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

Bloodvessels 

Three types of bloodvessels

Draw a table in your notes:

Type of bloodvessel	Direction	Pressure	Pulse
Artery (Slagader)
Vein (ader)

Artery (slagader)

Come directly from the heart

High bloodpressure

You can feel the pulse

Vein (ader)

Moves blood back to the heart from the organs

Low blood pressure, no noticeable pulse

Closer to the body's surface

How does the blood go up?

Vein (ader)

Moves blood back to the heart from the organs

Low blood pressure, no noticeable pulse

Closer to the body's surface

How does the blood go up?

Valves! a.o. In arms and legs

Capillary (haarvat)

Tiny! Walls of capillaries are only 1 cell thick

Capillaries in an organ form a capillary network

All the blood vessels in your body form the circulatory system, figure 26 (page 114)

Which statement is true?

1. In general, the circulatory system looks like this: Heart -> veins -> capillaries -> arteries -> heart
2. In general, the circulatory system looks like this: Heart -> arteries -> capillaries -> veins -> heart

Why "in general"?

Why "in general"?

One exception: The portal vein (poort ader)

Moves blood from the small intestine to the liver

Why do we need a special vein which goes from the small intestine to the liver and THEN to the heart?

Which blood vessel has a thick and elastic wall?

1. All of them
2. Arteries
3. Capillaries
4. Veins

Which blood vessel has a wall which is only 1 cell thick?

1. All of them
2. Arteries
3. Capillaries
4. Veins

Which blood vessels can contain valves?

1. All of them
2. Arteries
3. Capillaries
4. Veins

Select all the things we can find in blood that belong to the "solids" group

1. Red blood cells
2. Platelets
3. Plasma protein
4. White blood cells

Today's goals

You can name some things which can be found in blood

You know the difference between arteries and veins