Anatomy of the Heart

The Heart
… and blood flow
Heart Facts
Your heart is about the same size
as your fist
An average adult body contains
about five quarts of blood (1.25
All the blood vessels in the body
joined end to end would stretch
62,000 miles or two and a half
times around the earth.
Heart Facts continued….
► The
heart circulates the body’s blood supply
~1000 times each day
► The
heart pumps the equivalent of 1,250 to
1,500 gallons of blood each day
► The
heart beats about 42,075,904 times per
YEAR – imagine a lifetime?
3 Layers of the Heart
► Pericardium
= protection, exterior, serous
► Myocardium = cardiac muscle tissue, involuntary
► Endocardium = interior layer, lines heart
Blood Flow
► Pulmonary
► No oxygen in blood
► carries
deoxygenated blood away from the
heart, to the lung, and returns oxygenated blood
back to the heart
Overview of blood circulation
Blood Flow continued….
► Systemic
► Oxygen in blood
► carries oxygenated
blood away from the
heart, to the body, and
returns deoxygenated
blood back to the heart
Heart Valves
► Allow
blood to flow in only one direction
► Four valves:
--Atrioventricular valves: between atria ventricles
• Bicuspid valve or Mitral valve (left)
• Tricuspid valve (right)
--Semilunar valves: between ventricle and artery/vein
• Pulmonary semilunar valve
• Aortic semilunar valve
Chordae Tendineae
► The
chordae tendineae, or heart strings, are
cord-like tendons that connect the muscles
to the tricuspid valve and the mitral valve in
the heart.
► When the right ventricle of the heart
contracts, the blood pressure pushes the
tricuspid valve closed and prevents a
backflow of blood into the right atrium.
Chordae Tendineae
(a.k.a. “heart strings”)
heart strings
Blood Flow STEP by STEP