Heart Lab Essay

Submitted By sermeno28
Words: 574
Pages: 3
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Mauricio Sermeno,
Physio3
11/3/2014
Partner: Sophia …. Pulse, Blood Pressure, ECG
Definitions:
Cardiac Myocytes: : A heart muscle cell. Sometimes called a myocyte when it is understood that it is in the heart.
Pacemaker cells: any specialized tissue that governs a rhythmic or cyclic biological activity, as the sino atrial node of the heart that controls heartbeat.
Cardiac systole: Contraction in heart tissue.
Cardiac diastole is the period phase of time when the heart refills with blood.
Blood pressure systole: The top number, which is also the higher of the two numbers, measures the pressure in the arteries when the heart beats
Blood pressure diastole The bottom number, which is also the lower of the two numbers, measures the pressure in the arteries between heartbeats.

1. On the Lead II section of your ECG strip, mark the following:
a. P, Q, R, S, T waves
b. Atrial depolarization
c. Ventricular depolarization
d. Start to end of ventricular mechanical contraction (systole)
e. Start to end of ventricular mechanical relaxation (diastole)
A) P wave is the atrial depolarization.
B) QRS is the ventricular depolarization.
C) T it ventricular repolarization
D) From the start of Q-S you get diastole Ventricle
E) At the end of the T wave you get Diastole Ventricles
2)Calculate your heart rate:
_1 beat ___ x __60 seconds__ = __83__
.72 1 minute minute
3)Sketch out an ECG. Underneath that, sketch out the atrial and ventricular myocardial action potentials, as they correspond with the
ECG. Underneath that, sketch out the timing of atrial and ventricular contraction. 4) Why is the QRS complex so much higher in amplitude than the other waves? The QRS complex is much higher because you need more energy to pump blood out of the heart into the whole body.
5) Which interval represents the AV nodal delay? Why is that delay important? The delay is between the T wave ant the start of the P wave. This is important because the atrium is relaxed

Blood Pressure

6)Why are there no sounds with the stethoscope when the cuff is inflated to 180 mmHg?
There is no sound because you have completely collapsed the artery
7) What is the basis for the Korotkoff sounds in the middle pressure range? Pressure is measured after you have completely collapsed the artery at 180mmhg. Once the blood
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