KS4 Biology

Blood Vessels

1 of 29

© Boardworks Ltd 2005



What blood vessels do




Summary questions

2 of 29

© Boardworks Ltd 2004

What blood vessels perform

We can get a good idea of the actual could appear like from

thinking about the job they must do.

We will look at a tiny section of the circulatory program.

There seems to end up being 3 types of blood vessel present.

one brings together the

different two

with each other

one will take

blood away

from the


3 of 29

Lung area

one requires

blood towards the


© Boardworks Ltd 2004

3 broad types of vessels

1 .

Blood vessels that take blood away from

the center are generally known as ARTERIES.


Remember, arterial blood vessels (away)

installment payments on your

Blood vessels that take blood vessels back to

the heart will be known as PROBLEMATIC VEINS.


Remember, veins

in (into

inside the heart)

some of up to 29

© Boardworks Ltd 2004

and in between…


Finally, if arterial blood vessels take bloodstream away from the

center and problematic veins take blood vessels back to the heart,

the moment does a great artery become a vein?

Very well, our third type of bloodstream vessel links the two.

We find it present where an artery finishes and a

vein is approximately to begin.

This kind of third kind of blood ship

is known as a CAPILLARY.

5 of 29

© Boardworks Ltd 2004


Blood Vessels

What blood vessels carry out


Blood vessels


Overview quiz

six of 30

© Boardworks Ltd 2005

Artery cross-section



7 of 29

heavy muscle

and elastic


© Boardworks Ltd 2004

Arteriole pressure

The small scale the lumen means that

blood will be under high pressure.

The thick fibrous wall fortifies

the artery.

Imagine utilizing a water hose and

putting your thumb 1 / 2 over the

open up end.

This particular is produced under larger

pressure and it runs faster.

almost 8 of 29

© Boardworks Ltd 2004

Properties of arteriole surfaces

thick arteriole wall


The supple allows the artery to stretch pressurized

whilst the muscle may contract to push the blood along.

9 of 29

© Boardworks Ltd 2004

The human pulse

This stretching with the artery is actually allows us to think a pulse. As the heart beats, that releases standard surges of blood. Since

these pass on the arterial blood vessels, the boat must stretch out to

allow the increased the flow of blood to pass.

This kind of stretching shoves on the epidermis, which we all sense like a




15 of 29



© Boardworks Ltd 2004

Blood flow in arteries

The blood flowing through an artery will probably be under high

pressure and moving quickly.

There is no chance that the bloodstream will convert and

begin travelling inside the opposite direction.

Therefore , there are no regulators present in arterial blood vessels.

11 of 29

© Boardworks Ltd 2004


Blood Vessels

What blood vessels do




Brief summary quiz

12 of twenty nine

© Boardworks Ltd 2004

Veins: cross-section

large lumen

thin muscle tissue and

supple fibres

13 of up to 29

© Boardworks Ltd 2005

Walls of veins

The lumen of the vein is much

thicker compared to the wall that

surrounds that.

There is much less of a need to

maintain a top pressure.

Them still have elastic and muscle but there is

much less present when compared to artery.

You are going to appreciate which the blood is flowing far less quickly through veins in comparison to arteries.

14 of up to 29

© Boardworks Ltd 2005

Getting an additional boost

The veins will be carrying blood vessels back for the heart.

Supplies have been sold and now it is running

out of energy.

It takes to return to the heart to receive another pump.

Unfortunately, this might lead to an actual

15 of 29


© Boardworks Ltd 2005

Preventing backflow

Q. What would happen in the event that blood loses so

very much energy which it stops and turns about?


the law of gravity



direction of

blood flow

This example could come up where blood is flowing against


However , there is also a solution to this problem and it comes in two parts.

of sixteen of...


4p Od Incepta Dissertation

The Wars Elements of Devastation Essay