2.3 Highways and byways

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

What have we discussed last lesson?

0

Left atrium

Pulmonary

Right atrium

Left ventricle

Right ventricle

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.

TALKING EXERCISE

There are three types of muscle tissue:

voluntary (or skeletal) muscle which is strong but 

gets tired quickly, involuntary (or smooth) muscle 

which is weaker but does not tire quickly & cardiac muscle has a combination of characteristics from voluntary and involuntary muscle

Discuss with another student which two characteristics cardiac muscle has and explain why you think so.

Which names for blood vessels have you already heard/learnt?

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