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Circulatory System - Blood Vessels

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by

Katie Hermens

on 17 May 2015

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Transcript of Circulatory System - Blood Vessels

Difference in Vessels
Arteries
Under higher pressures
Used to measure BP
Walls of vessels are thicker
The stretch of the walls are what makes you feel your pulse
Flow of Blood
From the capillaries, the
DEOXYGENATED
blood goes to
venules.

From the venules, the blood flows to
veins.

Then the blood flows back to the 2 largest veins called the
superior
and
inferior
vena cava.
Flow of blood
The largest artery, called the
aorta
, pumps
OXYGENATED
blood away from the heart.

The blood then moves into
arteries
, then into smaller
arterioles
, and then the tiniest blood vessels called
capillaries

where rapid exchange of materials occur (i.e nutrients/wastes and O2/CO2).
3 Types of Blood Vessels
1.
Arteries
: carry blood
AWAY
from the heart

2.
Capillaries
: move/exchange
nutrients
, O2 and waste (
CO2
) across the membrane

3.
Veins
:
RETURN
blood to the heart
Blood Vessels
Veins
Less muscular than arteries
Have valves to keep blood flowing in one direction
Capillaries
Sites of gas exchange
Closely associated with cells
Walls are thinnest
Full transcript