YR2-CH5&6-LSN4

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

HAVE READY:

GOOGLE CLASSROOM

KERBOODLE PAGE 67-71

your homework FOR TODAY

TODAY:

- discuss difficult hw assignments

- discuss notes for today

- work on in class assignments.

CLASS ASSIGNMENTS LSN 3:

-  Complete the exercises on tb pages 78 and 79

ANSWER SHEET IS ON CLASSROOM, CHECK & DISCUSS THE ANSWERS

ANY QUESTIONS ABOUT THE HW ASSIGNMENTS:

NOTES HW FOR LSN 4:

- did you understand all the learning goals?

- did you understand all the key words?

- do you have any questions?

ANY QUESTIONS ABOUT THE NOTES:

The heart 

- is a double pump

 - left side pumps oxygen rich

    blood (red) towards your

    body

- right side pumps oxygen

   poor blood (blue) towards

   your lungs 

left = right

Yes, in the picture the left side is blue - this indicates oxigen poor blood, but actually it is the right side of the heart

We always see the heart from the front, but we consider it our own heart.

When I raise my right hand, you will not say that it is my left hand...

The heart

- four chambers

- 2 atria

- 2 ventricles

Blood always enters the heart via an atrium

Blood flow

Bloodflow in the heart is a 

one-way street.

It follows the direction of the arrows

From which chamber of the heart does blood leave to go to the lungs?

1. Right ventricle
2. Right atrium
3. Left ventricle

Which chamber produces the highest pressure in the blood?

1. Right atrium
2. Left atrium
3. Left ventricle

How is it possible that blood only flows one way?
Because:

1. of the blood pressure
2. blood cells know how to flow
3. there are valves
4. how the heart contracts

Valves

Valves only open in one way,

just like a door, if you push from one side the door opens easily, but if you push from the other side you will push it even closer...

one way valve

As you can see, a valve only opens in one direction

Aorta

pulmonary artery

pulmonary vein

vena cava

right atrium

right ventricle

left atrium

left ventricle

tricuspid valve

aortic  valve

mitral valve

pulmonary valve

septum

apex

Blood supply to the heart

The heart works really hard and needs a lot of glucose and oxygen for its respiration.

This is provided by the coronary arteries that run on the the outside of the heart.

Blood vessels types

• Arteries - carry blood away from the heart
• Veins - Carry blood back to the heart
• Capillaries - go to every cell in the body (oxygen and co2 exchange)

Arteries

• Elastic walls which stretch
• They contract and bounce back to force the blood along ('Pulse')

Veins

• Are wider than arteries
• Thinner walls
• pressure is much lower
• blood is squeezed along by your muscles 
• Flow is helped by valves 

Capillaries

• Smallest blood vessels
• Very thin walls
• Large surface area
  
  
• Easy for gas exchange

	Wall	Pressure	Speed	Valves
Artery
Vein
Capillary

One cell thick

thick, elastic

thin

high

high

low

low

high to low

high to low

yes

no

no

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

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

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

1. 1.artery 2. vein 3. capillary
2. 1. capillary 2. artery 3. vein
3. 1. vein 2. capillary 3 artery
4. all answers are wrong

Naming of the blood vessels

• Arteries: organ it is going to + artery, for example pulmonary artery
• Veins: organ it is coming from + vein, for example pulmonary vein
• Capillaries: too many to name, just lung capillaries

WHAT TO DO NOW:

- WORK ON THE IN CLASS ASSIGNMENTS FOR LESSON 4

- COMPLETE THESE FIRST

- STUDY FOR YOUR TESTWEEK!!