Transcript Heart Structure

Heart
Structure
•slightly on the left hand
side of the chest
made of cardiac muscle
called MYOCARDIUM
•about the size of
your fist
made up of 4
chambers
surrounded by a fluid
filled sac called the
PERICARDIUM
More Heart Information
 heart
divided
into 2 sides
2
sides
divided by a
wall called the
SEPTUM
largest chamber is the LEFT
VENTRICLE
chambers divided by VALVES
Types of
Heart
Chambers
ATRIUM
(atria plural)
UPPER chambers
RECIEVES blood from either the
LUNGS or the BODY
THINNER walls
VENTRICLES
LOWER chambers
pumps blood OUT OF THE
HEART either to the body or the
lungs
THICKER walls
SIDES OF THE HEART
 RIGHT

HAND SIDE
RECEIVES blood from the body
– contains DEOXYGENATED BLOOD
– sends blood to lungs via
PULMONARY circulation
LEFT HAND SIDE
receives blood from the LUNGS
contains OXYGENATED BLOOD
sends blood to the body via of
SYSTEMIC CIRCULATION
VALVES -
PREVENTS
THE
BACKWASH
OF BLOOD
A - V valves
SEPARATE the atria and the
ventricles
run by TENDONS
R -TRICUSPID valve
L -MITRAL / BICUSPID valve
SEMILUNAR valves
separate the HEART & THE BODY
run by_BACKPRESSURE
R -PULMONARY valve
L -_AORTIC valve
HEART BEAT
CONTROL
NODES - nerve knots that
receive signals from the
brain
S A NODE- the pacemaker
 receives
message
from the BRAIN
causes contraction
of the
ATRIA
A V NODE

receives message
from the
S A NODE
causes contraction of
the VENTRICLES