3.3 The heart diy

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3.3 The heart

1. Read everything!

2.. Make notes!

4. Write down questions you have for me!

Location of the heart

The heart

-The heart is a double pump. Both sides pump blood into different directions.

-right side pumps oxygen-poor

  blood.

-left side pumps oxygen-rich 

  blood.

-Left and right are the other way around. You look at it from your own bodies perspective.

Right side

Left side

When is blood 'Oxygenpoor' ?

1. when the concentration oxygen is low
2. when the concentration oxygen is high

Structure of the heart

The heart is a hollow muscle.

Coronary arteries (red arteries) supply Oxygen-rich blood + nutrients to the heart.

Coronary veins (blue veins) carry Carbon dioxide + waste products away from the heart. 

The heart has four chambers:

- Left atrium

- Right atrium

- Left ventricle

- Right ventricle

Blood always enters the heart through the atria.

Septum: a wall separating the left and right side of the heart.

Septum

How many chambers does the heart have?

1. 2
2. 4
3. 6
4. 8

Bloodflow

*Superior vena cava: Oxygen-poor blood from head + arms to right atrium

*Inferior vena cava: Oxygen-poor blood from torso + legs to right atrium

*Pulmonary artery: Oxygen-poor blood from heart to the lungs.

*Pulmonary veins: Oxygen-rich blood from lungs to left atrium 

*Aorta: Pumps Oxygen-rich blood to rest of the body

Which artery brings blood to the heart?

1. Aorta
2. Coronary arteries
3. Coronary veins
4. Pulmonary artery

The heart receives oxygen rich blood from the ...

1. Pulmonary veins
2. Pulmonary arteries
3. Coronary arteries/veins
4. Aorta

The heart pumps oxygen rich blood into the?

1. Superior vena cava
2. Pulmonary arteries
3. Aorta
4. Aorta and pulmonary arteries

atrioventricular valves

*the atria and the  ventricles areseparated by atrioventricular valves.

*Semilunar valves keep blood from flowing back into ventricles.

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

When blood flows back to the heart where does it go first?

1. Into the valves
2. Into the atria
3. Into the ventricles
4. Into the septum

Which part of the circulatory system prevents blood from flowing back?

1. Veins
2. Arteries
3. Valves
4. Atria

cardiac cycle

On average, an adult’s heart muscle contracts seventy times a minute. That is what we call ‘a heart rate of 70’

The way the heart works is made up of three phases:

1.  atria contract, blood flows into  ventricles (ventricles relaxed)

2.  ventricles contract, blood flows into aorta and pulmonary 

   artery (atria relaxed).

3. Heart relaxes, blood flows into atria.

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Now you try!

Read 3.3 the heart

make ex. 1, 2, 3, 5, 7

done?

Make the test yourself of 3.3