Transcript Cardiovascular System

Cardiovascular System
Also known as the Circulatory
System
• Consists of the heart, blood vessels, and
blood.
• Transports oxygen and nutrients to body
cells.
• Transports carbon dioxide and metabolic
materials away from body cells.
• https://www.youtube.com/watch?v=KSbbD
nbSEyM
Heart
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Muscular, hollow organ
Pump
Size of a closed fist
Located in the mediastinal cavity, between
the lungs, posterior to the sternum, and
superior to the diaphragm
Three layers of tissue form the
heart
• Endocardium- Smooth, lines the inside of
the heart. Allows for smooth blood flow.
• Myocardium- Thickest layer. Muscular
middle layer.
• Pericardium- Double layered membrane or
sac. Covers the outside of the heart.
Septum
• Muscular wall
• Separates the heart into a right and left side.
• Prevents blood from moving between the
right and left side of the heart.
Heart Chambers
• Four chambers
• Two upper chambers called atria
• Two lower chambers called ventricles
Right Atrium
• Receives blood as it is
returns from body
cells
Right Ventricle
• Receives blood from
the right atrium
• Pushes blood into the
pulmonary artery,
which carries blood to
the lungs for oxygen.
Left Atrium
• Receives oxygenated
blood from the lungs.
Left Ventricle
• Receives blood from
the left atrium.
• Pushes the blood into
the aorta so it can be
carried to body cells.
Valves
• One-way valves in the chambers of the
heart keep the blood flowing in the right
direction.
Tricuspid valve
• Located between the
right atrium and the
right ventricle.
• Closes when the right
ventricle contracts and
pushes blood into the
lungs.
• Prevents blood from
flowing back into the
right atrium.
Pulmonary Valve
• Located between the right
ventricle and pulmonary
artery.
• Closes when the right
ventricle has finished
contracting and pushing
blood into the pulmonary
artery.
• Prevents blood from
flowing back into the right
ventricle.
Mitral or Bicuspid Valve
• Located between the
left atrium and the left
ventricle.
• Closes when the left
ventricle is contracting
and pushing blood into
the aorta.
• Prevents blood from
flowing back into the
left atrium.
Aortic Valve
• Located between the left
ventricle and the aorta (the
largest artery in the body).
• Closes when the left
ventricle is finished
contracting and pushing
blood into the aorta.
• Prevents blood from
flowing back into the left
ventricle.
http://www.youtube.com/watch?
v=VsLLP0ubQH8
Activity
Now you will label a heart
diagram.
In order to receive full credit
describe the function of each part
of the heart you are labeling and
tell if has oxygenated or
deoxygenated blood.
Right and Left sides of the heart
work together in a cyclic manner
even though they are separated
by the septum
Electrical impulses originating in
the heart causes the myocardium
to contract in a cyclic manner.
http://www.youtube.com/watch?
v=qiIUrCe2Sxs
http://www.youtube.com/watch?v=fZT9vlbL2uA
Cycle consists of a brief period of
rest called diastole followed by a
period of ventricular contraction
called systole
At the start of the cycle, the sinoatrial node creates
an impulse that spreads across the atria causing them
to simultaneously contract and push blood into the
ventricles ventricles.
The impulse reaches the atrioventricular node
where there is a brief pause causing the atria
to relax and refill.
The impulse then travels through the bundle
of His, down the left and right bundle
branches and to the purkinje fibers causing the
ventricles to contract. This active phase of
ventricular contraction is called systole.
The right ventricle pushes blood
into the pulmonary artery so it
can go to the lungs for oxygen.
The left ventricle pushes blood
into the aorta so it can be carried
to all parts of the body.
Heartbeat Cycle
youtube for heartbeat cycle merination.com