Download Circulatory System ppt

EVERYTHING YOU EVER
WANTED TO KNOW
ABOUT HEARTS
Anatomy of the Heart
• The heart is a hollow muscle.
• It is located on the left side of your chest,
about the size of your clenched fist
• It is divided into four sections called chambers
• Two chambers are on the left and right side.
• Each side has an upper and lower chamber.
Chambers of the Heart
Chambers of the Heart
• The right upper receives blood from the body.
• The right lower pumps blood to the lungs.
• The left upper receives blood from the lungs.
• The left lower pumps blood to the rest of the
body.
Blood flow in the heart
Flow around the body
Systemic Circulation
Valves
• Valves are flaps of tissue that stop blood flowing
backwards
• There are two kinds of valves in the heart.
• The first kind is the massive valves between the atria
and the ventricles, the atrio-ventricular valves, (AV
valves) that prevent blood in the ventricles from
flowing back into the atria.
• The flaps of these valves are attached to the walls of
the ventricles by tendons – chordae tendinae
Valves
• The second kind of valve is pocket shaped
flaps of tissue called the semilunar (half
moon) valves
• They are called the pulmonary and aortic
valves and found at the entrance of the
pulmonary artery and aorta respectively
Whats the Lub Dub?
What’s the Lub Dub?
• The first heart sound (lub) is caused by the
acceleration and deceleration of blood and a
vibration of the heart at the time of the
closure of the tricuspid and mitral valves.
• The second heart sound (dub) is caused by the
same acceleration and deceleration of blood
and vibrations at the time of closure of the
pulmonic and aortic valves.
• http://www.nhlbi.nih.gov/health/dci/Diseases
/hhw/hhw_pumping.html
• http://www.nucleusinc.com/animation2.php