Lesson 4 : Blood pressure & diseases

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

Blood pressure

TODAY:

- Blood pressure

-Heart diseases

Pay attention to the video:

- What is diastolic pressure?

- What is systolic pressure?

- What is a healthy blood pressure?

- Why is it bad when it is too high or too low?

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What is the diastolic blood pressure?

1. The blood pressure when the heart muscles are relaxed
2. The blood pressure when the heart muscles are contracted

What is the systolic blood pressure?

1. The blood pressure when the heart muscles are relaxed
2. The blood pressure when the heart muscles are contracted

What is a healthy blood pressure?

1. 120/80 mmHg
2. 140/90 mmHg
3. 80/40 mmHg
4. 200/220 mmHg

Why is it bad if it is too high or too low?

1. it causes damage to blood vessels
2. It is doesn't really matter
3. You get really tired
4. You feel sick

2 sides of the heart work together

Diastole

-Heart muscles are relaxed

-Blood flows into the atria from the veins

Systole (atria or ventricles)

Heart muscles contract

1. Atria contract (DA...)
- blood forces into the ventricles 

2. Ventricles contract (DUM...)
- blood forced into the arteries 

heart attack

• One or more bloodvessels around the heart muscle (coronary arteries) is blocked
• Parts of the heart stop beating or start beating irregularly
• Blockage = called thrombosis

Stroke

• One or more bloodvessels to the brain are blocked.
• Parts of the brain get starved of oxygen and can be damaged permanently.

Risk factors

-inherited genes

-age

-sex (men have a higher chance)

-eating fatty foods

-being over weight

-smoking

-taking little or no exercise

Da-dum-.......

Da:

• The left and right atria contract
• The left and right ventricles relax
• The tricuspid and mitral valves open
• The blood flows into the left and right ventricles
  
• The pulmonary and aortic valves close (the sound DA)

Now read and do the exercises