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BIOL251 Human Anatomy And Physiology With Lab II

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BIOL251 Human Anatomy And Physiology With Lab II

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BIOL251 Human Anatomy And Physiology With Lab II

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Course Code: BIOL251
University: American Public University System

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Country: United States

Question:
                                 

(5 pts)     
P-R interval _________  P wave
Q-T interval
When does atrial repolarization occur?
When does atrial depolarization occur?
When does ventricular repolarization occur?
(2 pts) What is the formula for the cardiac output?    What is the definition of “cardiac output”?
(2 pts)  What is the formula for stroke volume?  What is the definition of “stroke volume”?
(1 pt)  According to Frank-Starling law, what is the most important factor effecting contractile force?

Answer:
                                       

P-R interval
The P-R interval shows the time of transit for the electrical signal or sign to move to the ventricles from the sinus node (Novotny et al., 2017). It is the time taken from the start of atrial depolarization to the start of ventricular depolarization.
Q-T interval
The Q-T represents a large upward deflection Q and a peak T. The Q-T interval shows time Ventricular repolarization and depolarization.
P wave
The P wave is a modest upward waveform which represents ventricular depolarization.
When does atrial repolarization occur?
Atrial repolarization occurs when the T wave displays a positive deflection. This is because the last cells which undergo depolarization in the ventricle are the first cells to undergo repolarization (Novotny et al., 2017). Similarly, this happens because the last cells which undergo depolarization are situated in the subepicardial area of the ventricle have shorter action potential compared to those located in the subendocardial areas of the ventricular walls.
When does atrial depolarization occur?
Atrial depolarization occurs when the Ta wave of atrial repolarization happens during QSR complex and PR segment. In other words, atrial depolarization occurs when the Ta wave overlaps with QSR complex.
When does ventricular repolarization occur?
Ventricular repolarization occurs between the start beginning of QRS complex and at the close of U wave or T wave.
What is the formula for the cardiac output? What is the definition of “cardiac output”?
Cardiac output refers to the quantity of blood which the pumps in a minute via the circulatory system (Banet et al., 2018). The formula for cardiac output is (Cardiac Output = heart rate x stroke volume)
What is the formula for stroke volume?  What is the definition of “stroke volume”?
Stroke volume refers to the quantity of blood which the left ventricle pumps in a single contraction. The formula of stroke volume is (stroke volume = cardiac output/heart rate).
According to Frank-Starling law, what is the most important factor effecting contractile force?
According to the Frank-Starling law, the most vital factor which affects contractile force includes the volume of the blood.
References:
Banet, M., HENRY, I., & Bernstein, D. (2018). U.S. Patent Application No. 10/052,041.
Novotny, T., Bond, R., Andrsova, I., Koc, L., Sisakova, M., Finlay, D., … & Malik, M. (2017). The role of computerized diagnostic proposals in the interpretation of the 12-lead electrocardiogram by cardiology and non-cardiology fellows. International journal of medical informatics, 101, 85-92.

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