Download Circulatory - Killeen ISD

Circulatory System
Also known as the cardiovascular
system
What is the function of the
circulatory system?
• Carries needed substances to cells
(oxygen, nutrients).
• Carries waste products away from cells.
• Contains cells that fight disease
What is the function of the heart?
• It pushes blood through the blood vessels
every time it beats.
• It is made up of cardiac tissue.
What is the structure of the heart?
• Atrium (atria): The 2 upper chambers of
the heart. They receive blood
that comes into the heart.
• Ventricle (s): The 2 lower chambers of
the heart. They pump blood out of
the heart.
What is the function of the atria?
Right atrium: receives blood from the body.
The blood is high in carbon dioxide and
low in oxygen.
Left atrium: receives blood from the lungs.
The blood is high in oxygen.
What is the function of the ventricles?
• Right ventricle: pumps blood to the lungs.
The blood is high in carbon dioxide.
• Left ventricle: pumps blood to the body.
The blood is high in oxygen.
Illustrated Heart
Describe the path blood takes as it
flows through your body?
• Blood from the body comes into the right
atrium.
• From here the blood flows into the right
ventricle where it is pumped to the lungs.
• Blood comes back from the lungs into the
left atrium.
• The blood flows to the left ventricle where
it is pumped to the rest of the body.
http://trc.ucdavis.edu/biosci10v/bis10v/media/ch22/blood_circulation.html
Cardiovascular System
http://trc.ucda
vis.edu/biosci
10v/bis10v/me
dia/ch22/majo
r_vessels.html
What are the blood vessels?
Describe the function of each.
• Arteries: carry blood away from the heart.
• Veins: carry blood back to the heart.
• Capillaries: the smallest blood vessels.
Exchanges substances between the blood
and body cells
What is the pulse? What is blood
pressure?
• Pulse: determines how fast your heart is beating.
It is caused by the contraction of the ventricles.
• Blood pressure: caused by the force with which
the ventricles contract. The top number is a
measure of pressure when the left ventricle
contracts. The lower number measures the
pressure when the ventricle relaxes between
heartbeats.
http://pennhealth.com/health_info/bloodless/000201.html
What are the components found in
blood?
• Red blood cells: take up oxygen in the lungs and
delivers oxygen to body cells.
• White blood cells: fight disease
• Plasma: the liquid part of blood
• Platelets: helps blood clot when a blood vessel is
cut.
What other body systems work with
the circulatory system?
• Respiratory system: The blood picks up
oxygen from the lungs.
• Nervous system: Keeps the heart beating
automatically. It is an involuntary muscle.
• Digestive system: Picks up needed
nutrients from foods and carries them to
body cells.
Amazing Heart Facts
• Your heart is about the same size as your
fist.
• An average adult body contains about five
quarts of blood.
• 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.
• The heart circulates the body's blood
supply about 1,000 times each day.
• The heart pumps the equivalent of 5,000
to 6,000 quarts of blood each day.