InSight
T h e h e a r t
Figure 11.4
THE PLANNER^
The heart is a four-chambered pump with valves to keep blood
flowing through it in only one direction. Several large vessels de-
liver blood to the heart and remove blood from it.
a.
Major parts of the
heart
Left atrium receives
oxygen-rich blood
from the lungs.
Aortic semilunar valve
prevents backflow of
blood into left ventricle.
Interventricular septum
separates the right and
left ventricles of the heart.
Pericardium covers
and protects the heart.
Pulmonary semilunar valve
prevents backflow of blood into
right ventricle.
Right atrium receives
oxygen-poor blood
from the body.
Tricuspid valve prevents
backflow of blood into right
atrium.
Bicuspid (mitral) valve
prevents backflow of blood
into left atrium.
Chordae tendineae connect
valves to papillary muscles.
Papillary
muscles prevent valve
cusps from going into the atria.
Left ventricle pumps
oxygen-rich blood to the body.
Right ventricle
pumps oxygen-poor
blood to the lungs.
b. Major blood vessels of the
heart
Superior vena
cava
is the vein that brings
blood to the heart from
the head, upper body,
and arms.
Right pulmonary
artery
Left coronary artery
carries blood to the
heart muscle itself.
Inferior vena
cava
is
the vein that brings
blood to the heart
from the lower body
and legs.
Aorta
is the artery that
carries blood away from
the heart to the body.
Pulmonary arteries carry
blood from the heart to
the lungs. This is the left
pulmonary artery.
Pulmonary veins carry
blood to the heart from
the lungs. This is the left
pulmonary vein.
Right coronary artery
carries blood to the
heart muscle itself.
Right
pulmonary
artery
Superior
vena
cava
Left atrium
'
Inferior
vena
cava
Coronary sinus drains
blood from the heart
muscle itself.
Anterior external view of the heart
Posterior external view of the heart
showing the surface
showing the surface
The Heart Pumps Blood Through Blood Vessels to All Tissues
313
previous page 348 Craig Freudenrich, Gerard J  Tortora   Visualizing Anatomy and Physiology   2011 read online next page 350 Craig Freudenrich, Gerard J  Tortora   Visualizing Anatomy and Physiology   2011 read online Home Toggle text on/off