Download The Heart - Ms. Mogck`s Classroom

The Heart
The
Pathway
of the
Blood
 Through the heart, beginning at the vena cava
 anterior (inferior)
vena cava is at the
bottom
 superior vena
cava is at the top
 blue blood
(deoxygenated) enters
the right atrium
 right atrium contracts
 blue blood is sent
through the AV valve
to the right ventricle
 right ventricle
contracts sending
blood through the
semilunar valve out
the pulmonary artery
 blood goes to the
lungs
 The arteries branch
into arteriolles
capillaries surround
the alveoli in the
lungs allowing the
oxygen to diffuse into
the lungs
 red blood returns
oxygenated to the
heart through the
pulmonary veins
 Oxygenated (red)
blood comes from
the lungs through
the Pulmonary VEIN
 red blood enters the
left atrium
 left atrium contracts
 forces blood
through the AV valve
into the left ventricle
 left ventricle is the
heart’s most muscular
chamber
 contraction of the left
ventricle sends blood
through the semilunar
valve out the aorta
 the aorta is the
largest ARTERY in
the body
 it sends oxygen
rich blood to the
body
 arteries branch
smaller into
arterioles and
eventually into
capillaries
 capillaries transfer
oxygen to tissues
(greatest surface
area) and extract
CO2 from tissues
into the blood
 after picking up
the CO2, capillaries
become venuoles
and veins which
lead back to the
heart
 deoxygenated
(blue) blood returns
to the heart
through the vena
cava (main vein)
Quick Question?!
What is the only blood vessel in
which diffusion can occur?
Heartbeat
 Systole and
Diastole phases
 Lub Dub of the
Heart
Diastole
 relaxation where
the atria or
ventricle fills with
blood
Systole
 ventricle or atrial
contraction to
eject blood from
the chamber
Lub Dub
 lub dub is caused
by the slamming
close of valves in
the heart
 Systole
 ventricles contract
sending blood out of
the heart
 high pressure forces
the AV valve to close
 AV valves closing
cause the LUB
 semilunar valves
are opened by
high pressure blood
leaving the
ventricles
 Diastole
 atria and ventricle
relax and fill with
blood
 low pressure
opens the AV valve
 Blood outside the
heart causes high
pressure and the
semilunar valve slams
shut
Producing the DUB
sound
 when the atria
contracts (atrial
systole) the blood is
forced into the
ventricle
 AV valve remains
open and the
semilunar remains
closed
Cardiac
Output
Cardiac output is the volume
of blood pumped by the heart
in one minute, which is equal to
the produce of stroke volume
and heart rate
Example
A typical human male has a stroke volume of 70mL per beat
and a resting heart rate of 72 beats per minute.
 a. Calculate the cardiac output. Express your answer in liters
per minute.
 b. Calculate the volume of blood that would be pumped in
ONE DAY based upon the cardiac output.
Work to Get Done!
Complete Topic 2 Practice
Questions (pg 11 booklet)
 Work on your lab write up!