2.4 Blood pressure & heart disease

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 2

0

The pathway of blood from the heart to the lungs, back to the heart is called the .... circulation.

The pathway of blood that provides the tissues and organs with oxygen is called the ... circulation.

The ... circulation provides the cardiac muscle with blood.

ACTIVITY.  COPY & FILL IN THE TABLE BELOW

ARTERY

CAPILLARY

VEIN

a bit muscular
/ towards the heart / often deoxygenated blood / not muscular / muscular / has valves / small diameter / important for gas exchange / microscopic / towards organs / lower pressure / wide diameter / away from organs / high pressure / elastic walls / runs through organs or tissues / diameter 0.001 mm / away from the heart / often oxygenated blood / very low pressure 

ARTERY

CAPILLARY

VEIN

• away from the heart
  
• often oxygenated blood
  
• elastic walls
  
• high pressure
  
• towards organs
  
• small diameter
  
• muscular

• a bit muscular
  
• wide diameter
  
• towards the heart
  
• often deoxygenated blood
  
• away from organs
  
• has valves
  
• very low pressure

• not muscular
  
• lower pressure
  
• diameter 0.001 mm
  
• microscopic 
• important for gas exchange
• runs through organs or tissues

Why do arteries have muscular walls?

Why do capillaries have very thin walls?

Why do veins have valves?

What do you think about when you hear the terms heart disease & blood pressure?

ACTIVITY.

Read the text, answer the matching questions on the A3 paper. 

Next lesson, we will discuss the answers to the questions.