CIRCULATORY
SYSTEM
Life function: TransportThe process by which
materials such
as(nutrients,O2,CO2,waste,
hormones and immune
factors) are moved between
cells=circulatory system
THINK
PAIR
SHARE
We
just finished digestion.
What is the relationship
between digestion and transport?
Digested
materials enter the
bloodstream through the villi in
the small intestine.
TRANSPORT AND CIRCULATION
In
order for material to enter
cells and move between cells, a
transport system is needed.
This system is called the
circulatory system.
HUMAN HAVE A
CLOSED CIRCULATORY SYSTEM
 Includes
3 parts
 1) A fluid (blood)to carry material.
 2)
A network (system) of tubes
(blood vessels) to carry fluid.
 3)
A pump (heart) to push fluid
along.
WHILE OTHER ORGANISM’S HAVE AN
OPEN CIRCULATORY SYSTEM
The fluid flows freely
throughout the body and is
not contained in tubes.
BLOOD VESSELS
3
kinds of vessels=arteries, veins,
capillaries.
 All together the vessels are
thousands of kilometers long.
 Carry blood through heart, lungs
and body.
ARTERIES
Have
thick muscular walls
that expand and contract as
blood is pumped. This
accounts for your pulse.
ARTERIES
 Carry
blood away from the heart to
the organs of the body.
 Elasticity of the walls exert pressure
on the blood inside =blood pressure.
 Can be blocked with fatty deposits.
 Large arteries branch , forming
smaller vessels eventually dividing
into arterioles (small arteries) and
then capillaries.
Why are capillaries important
parts of the circulatory system?
CAPILLARIES
Smallest
vessels one cell thick.
Near everybody cell.
Exchange of materials between
blood and cells. they connect the
smallest arterioles with the
smallest veins (venules)
Capillaries are where important materials
are exchanged between the blood and
your cells
capillaries
cells
1 - Oxygen, nutrients,
hormones
1
BLOOD
(in capillary)
CELLS IN BODY
2
2 – hormones,
metabolic wastes
including Carbon
dioxide
The
capillaries
“do
business”
with the
cells
 Capillaries readily
exchange dissolved
materials by diffusion
between the blood and
the ICF surrounding all
body cells.
VEINS
Carry blood from
the body to the
heart. Walls are
thinner than
those of the
arteries.
VEINS
Contain
valves that allow
blood to flow in only one
direction . If your valves fail
to work ,blood builds up ,
veins loose elasticity, and
varicose veins form.
SPIDER VEINS
LYMPHATIC SYSTEM
Fluid
from the
 bloodstream is
constantly leaking from
the capillaries into
 surrounding tissues.
LYMPHATIC SYSTEM
This
fluid helps bring
nutrients to cells that need
them, It also helps cells
fight off infectious disease.
WHAT HAPPENS
TO ALL THIS FLUID
A
?
network of vessels called
the lymphatic system
collected the fluid (lymph),
and returns it to the
circulatory system.
LYMPH NODES
 Lymph
nodes exist
at various places in
the body .
1.These are glands
filter foreign matter
from the lymph.
 2. and prevent disease causing
organism from entering the
bloodstream.