Transcript Skeletal System: Bones & Joints

Circulatory
System
Notes
Functions of the
circulatory system…
-Carries
nutrients,
oxygen & other
needed
materials to
cells
Functions of the
circulatory system…
-Carries
carbon
dioxide &
other wastes
away from
cells
Functions of the
circulatory system…
-Blood helps
fight disease
& heal
wounds.
Functions of the
circulatory system…
-Helps
maintain
body
temperature
&
homeostasis.
The circulatory
system is made
up of the:
Heart
Blood &
Blood vessels
Heart…
muscular
organ that
pumps blood
throughout
the body.
right side pumps
blood to lungs &
left side pumps
blood to body…
separated by a
thick muscular
wall called the
septum.
Upper two chambers
are called the atrium
(atria) & receive blood
into the heart…
…the lower two
chambers are ventricles
that have thick muscles
to pump blood out of the
heart.
Upper & lower chambers
are separated by valves
that keep blood from
flowing backward.
Heartbeat
muscle
contractions
that push
blood through
the blood
vessels.
You hear the valves
opening & closing…
when the heart muscles
relax the valves open &
the atria fill with blood
LUB… then the ventricles
contract & the valves
close DUB.
Pulse
Throbbing of
arteries as heart
beats & pumps
blood…
used to determine
heart rate.
Blood pressure
force with which
the ventricles
contract.
Blood vessels…
Arteries 
Capillaries
Veins
Arteries
Muscular blood
vessels that carry
blood with
oxygen away
from the heart.
Pulmonary artery
Carries blood from
heart to lungs…
only artery that
does not carry
oxygenated blood.
Aorta
largest human
artery that
carries blood from
the heart to the
body.
Capillaries
smallest blood vessels
where substances are
exchanged by the
process of diffusion
Veins…
carry blood with
carbon dioxide
to the heart
from the body.
Pulmonary vein
Carries blood from
lungs to heart…
only vein that not
carries oxygenated
blood.
Superior
vena cava is
the largest
vein in the
human body.
Hypertension
(high blood pressure)
occurs when the
pressure in the blood
vessels is too high…
above 140/90.
The heart has
to work
harder.
Can cause damage
to the heart,
arteries and other
organs.
Heart attacks
occur when
arteries get
clogged and
stop the flow
of blood to the
heart muscles.
Strokes
occurs when the blood
supply to the brain is
cut off or when a blood
vessel burst causing
damage to brain cells.
Atherosclerosis
is a condition where
artery walls thicken
and restrict the flow
of blood in the
arteries.
Caused by high
cholesterol that
deposits in the
arteries causing
them to narrow or
harden.
Can lead
to heart,
disease or
strokes.
Irregular
heartbeats
occur when the
heart rhythm is
too fast or too
slow.