Download L5 Heart anatomy

The Heart: L5
44
Very muscular organ
about the size of your fist
 The major portion of the
heart is called the
myocardium
 
  It
is mostly composed of
cardiac muscle
L5 The Heart
45
Epithelial and fibrous
tissue called pericardium
covers the heart
 This tissue forms the
pericardial sac.
 
  the
heart is located within
this sac and contains
lubricating liquid
L5 The Heart
46
Think of it as two separate
pumps:
 
  One(on
the right side of the
heart) pumps blood to the
lungs
  The other (on the left side of
the heart) pumps blood to
the rest of the body
The left and right side of
the heart is divided by the
septum
 
L5 The Heart
47
On each side are two chambers.
 
  The
smaller one, located on the
top, is called the atrium (atria)
  The larger one, on the bottom, is
called the ventricle.
 
The left ventricle is considerably larger
than the right ventricle because while
the right ventricle only pumps blood to
the lungs, the left ventricle must pump
to the rest of the body
L5 The Heart
48
There are valves between
the atria and ventricle,
collectively referred to as
atrioventricular valves
and prevent backflow
 
A heart murmur is
caused by faulty valves in
your heart!
L5 The Heart
49
a tricuspid valve with *3
flaps or cusps * on the
right side.
 
L5 The Heart
50
and a bicuspid valve
(or mitral valve) that
*has two cusps* on the
left side
 
L5 The Heart
51
Chordae Tendinae
 
  Very
strong, fibrous
strings that support the
valves and prevent them
from inverting
L5 The Heart
52
Each ventricle also has a
semi-lunar valve
between it and its
attached blood vessels.
It prevents backflow
 
53
AV Valve
AV Valve
Semilunar Valve
Semilunar Valve
L5 The Path of Blood Through the Heart
54
1.) Blood enters the right
atrium through the superior
(top) and inferior(bottom)
venae cavae=the bodies
largest veins
 2.) the right atrium
contracts, forcing the blood
into the right ventricle
 
L5 The Path of Blood Through the Heart
55
3.) The right ventricle
contracts sending the
blood to the lungs through
the pulmonary artery.
 4.) At the lungs the blood
is now oxygenated
 5.) blood returns via
pulmonary veins to the left
atrium
 
L5 The Path of Blood Through the Heart
57
6.) The left atrium
contracts, forcing the
blood into the left
ventricle.
 7.) the left ventricle
contracts, forcing the
blood into the aorta=
the body s largest
artery
 
Blood Flow Animation
 
http://www.sciencelearn.org.nz/Contexts/Seethrough-Body/Sci-Media/Animations-andInteractives/Label-the-heart