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3 March 2014. Fit For Life. Learning Objective To learn about blood pressure and heart disease. Some. Explain the effects of heart disease. (B). Most. All. Describe the effects of heart disease. (C). State that blood is under pressure in arteries. (D).

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slide1

3 March 2014

Fit For Life

Learning Objective

To learn about blood pressure and heart disease.

Some

  • Explain the effects of heart disease. (B)

Most

All

  • Describe the effects of heart disease. (C)
  • State that blood is under pressure in arteries. (D)
slide2

The heart is made almost entirely of muscle. It is unlike

  • any other muscle in your body because it never tires.
  • And even though it is full of blood it still needs it own
  • blood supply. Oxygenated blood is carried to the heart
  • by the coronary arteries.
  • Each side of the heart has two chambers.
        • An top chamber or atrium and
        • A bottom chamber or ventricle

Each of these chambers has its own function. Look at the diagram on the next slide to see what that is.

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide3

The Heart

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide4

The Heart

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide5

Besides the chambers there is also another very important part of the heart – the valves. These valves are found between the top and bottom chambers on both sides of the heart.

These valves are rather like doors that only open in one direction.

blood

valve

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide6

As the atrium fills with blood, the valves are closed.

When the atrium contracts and squeeze the blood, the valves are pushed open

These valves are connected to the side wall of the heart by tough tendons. These tendons allow the valves to close but not invert.

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide7

We also find valves here

...and here!

These extra valves stop the blood from re-entering the heart when it is pumped from the ventricles.

When the blood knocks against the first heart valves, it makes a ‘lub’ like sound.

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide8

When the blood knocks against the second set of heart valves, it makes a ‘dub’ like sound.

Artery

The blood ‘slaps’ against the valve and then passes along the artery.

Ventricle

Valve

These two sounds – lub and dub – are actually what we hear as our heartbeat. So our heartbeat is in fact the sound of the valves opening and closing.

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide9

Blood pressure definitions

Systolic – pressure near the end of the cardiac cycle when the ventricles contract and are empty of blood

Diastolic – pressure at the beginning of the cardiac cycle when the ventricles are filled with blood.

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide10

The following diagram shows the position and name of the main valves in the heart.

Click on the heart.

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide11

Blood from the body

Blood from the lungs

1. The heart beat begins when the heart muscles relax and blood flows into the atria.

  • The atria then contract and the valves open to allow blood into the ventricles.

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide12

The Ventricles contract forcing the blood to leave the heart. At the same time, the atria are relaxing and once again filling with blood.

The staged cycle then repeats itself.

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide13

Just before we finish our study, let’s take a last look at the heart…..

Do you notice anything different about the two sides of the heart?

Well, the left ventricle wall is clearly thicker than the right ventricle wall.

Why is this?

To answer this question, think about where the blood is going when it leaves the right and left ventricles.

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide14

Lungs

This journey is far less demanding. The right ventricle only has to pump blood from the heart to the adjacent lungs.

This journey is enormous. The left ventricle has to pump blood all over the body!

Body cells

Therefore, the left ventricle needs a thicker wall to generate a stronger ‘squeeze’ on the blood.

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide15

Deaths from heart disease

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide16

Deaths from heart disease

Why does coronary heart disease happen?

Coronary heart disease is the term that describes what happens when your heart's blood supply is blocked or interrupted by a build-up of fatty substances in the coronary arteries.

Over time, the walls of your arteries can become furred up with fatty deposits. This process is known as atherosclerosis and the fatty deposits are called atheroma.

Atherosclerosis can be caused by lifestyle habits and other conditions, such as:

smoking

high cholesterol

high blood pressure (hypertension)

Diabetes

Read more about the causes of coronary heart disease.

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – explain the effects of heart disease. (B)

slide17

Drag the labels to the correct numbered boxes

on the diagram of the blood system

slide24

to learn about blood pressure and heart disease.

The heart – research project

All – state that blood is under pressure in arteries. (D)

Most – Describe the effects of heart disease. (C)

Some – Explain the difference between health and fitness. (B)