Transcript Cardiac Cycle, Output and Sounds of the Heart

Cardiac Cycle, Output
and Sounds of the
Heart
By: Cara Amundson, Trey Osterholt,
Mohammad Ahmed, Abby Lathrop
• Cardiac muscle: The type of muscle that is found in the
walls of the heart. Cardiac muscle is striated but
branched, unlike the straight-shaped striated skeletal
muscle cells.
• Cardiac Cycle: The rhythmic
contraction (systole) and relaxation
(diastole) of the chambers of the
heart that corresponds to one
heartbeat.
• One cardiac cycle is completed when
the heart fills with blood and the blood
is pumped out of the heart
• cardiac output (CO): the effective
volume of blood expelled by either
ventricle of the heart per unit of time
(usually per minute).
• Diastole: The phase of the heartbeat when the heart muscle relaxes
and allows the chambers to fill with blood.
• Systole: The phase of the heartbeat when the heart muscle contracts
and pumps blood from the chambers into the arteries.
• The normal heart sound is typically described as "lub-dub.”
• The sounds of the heart are only from the valves closing, not
opening
• The sounds are also amplified by the chest, making them more
audible.
• http://www.youtube.com/watch?v=-4kGMI-qQ3I
Heart Sounds
• The "lub" is the first heart sound
• The "lub" sound is usually softer and longer than the
"dub”
• The "lub" is the sound of the tricuspid and mitral valves
closing.
The “Lub”
• The "DUB" is the sound of the aortic and pulmonary
valves closing.
• The "dub" sound is shorter and louder than the "lub"
sound.
• http://www.youtube.com/watch?v=qYBtchCqPao
• http://depts.washington.edu/physdx/heart/demo.html
The Dub
• Stroke Volume: The amount of blood pumped out of one
ventricle of the heart as the result of a single contraction.
• A measure of the effectiveness of ventricular contraction.
• Measured in millimeters (ml)
Stroke Volume
• cardiac output (CO): the effective
volume of blood expelled by either
ventricle of the heart per unit of time
(usually per minute).
• Cardiac Output in mL/min = heart
rate (beats/min) X stroke volume
(mL/beat)
• An average person has a resting heart
rate of 70 beats/minute and a resting
stroke volume of 70 mL/beat. The
cardiac output for this person at rest
is:
• Cardiac Output = 70 (beats/min) X
70 (mL/beat) = 4900 mL/minute.
Cardiac Output
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Web MD
http://biology.about.com/od/anatomy/ss/cardiac_cycle.htm
Thefreedictionary.com
Biologydictionary.com
Youtube.com
http://www.google.com/imgres?q=diastole&um=1&safe=active&sa=N&rls=com.
microsoft:en-us:IESearchBox&hl=en&biw=1366&bih=600&tbm=isch&tbnid=iTXot679tbx7wM:&
imgrefurl=http://www.rnceus.com/hemo/bloodflo.htm&docid=Gdgg9UCkw07xM&imgurl=http://www.rnceus.com/hemo/Images/systole.gif&w=337&h=286
&ei=w9t2UZSsEaqp2QXI5oCYBA&zoom=1&iact=rc&dur=171&page=1&tbnh
=148&tbnw=174&start=0&ndsp=22&ved=1t:429,r:8,s:0,i:109&tx=72&ty=93
• http://www.biosbcc.net/doohan/sample/htm/COandMAPhtm.htm
• http://www.google.com/imgres?q=cardiac+output&um=1&safe=active&sa=N&rl
s=com.microsoft:en-us:IESearchBox&hl=en&biw=1366&bih=600&tbm=isch&tbnid=swsK25wbREdgjM:
&imgrefurl=http://www.learnhemodynamics.com/hemo/contract.htm&docid=9m
xM08QihhD5jM&imgurl=http://www.learnhemodynamics.com/hemo/images/B
ABYPROP.jpg&w=520&h=364&ei=Edx2UbnQDcKW2QW0wYGgAg&zoom=
1&iact=rc&page=1&tbnh=139&tbnw=218&start=0&ndsp=19&ved=1t:429,r:9,s:
0,i:112&tx=186&ty=125
• https://en.wikipedia.org/wiki/Heart_sounds
Works Cited