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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. C ardiac 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. .

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Cardiac Cycle, Output and Sounds of the Heart

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  1. Cardiac Cycle, Output and Sounds of the Heart By: Cara Amundson, Trey Osterholt, Mohammad Ahmed, Abby Lathrop

  2. 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.

  3. 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).

  4. 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.

  5. 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

  6. 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”

  7. 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

  8. 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

  9. 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

  10. 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:IE-SearchBox&hl=en&biw=1366&bih=600&tbm=isch&tbnid=iTXot679tbx7wM:&imgrefurl=http://www.rnceus.com/hemo/bloodflo.htm&docid=Gdgg9UCkw0-7xM&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&rls=com.microsoft:en-us:IE-SearchBox&hl=en&biw=1366&bih=600&tbm=isch&tbnid=swsK25wbREdgjM:&imgrefurl=http://www.learnhemodynamics.com/hemo/contract.htm&docid=9mxM08QihhD5jM&imgurl=http://www.learnhemodynamics.com/hemo/images/BABYPROP.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

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