18 Questions
During diastole in the cardiac cycle, what happens?
Atria and ventricles fill with blood
Where is the sinoatrial (SA) node located?
In the wall of the right atrium
What is the function of the atrioventricular (AV) node in the heart's conduction system?
To regulate heart wall contractions via electrical impulses
Which part of the heart acts as a 'pacemaker' due to its role in generating electrical impulses?
Sinoatrial (SA) node
What triggers the semilunar valves to shut during the cardiac cycle?
Backflow in the aorta & pulmonary arteries
What is the main role of the bundle branches in the heart's conduction system?
To carry nerve impulses affecting contractions
Which component of the heart's electrical conduction system is responsible for depolarizing the atria?
SA node
What is the main purpose of an electrocardiogram (ECG or EKG)?
Recording the electrical changes in the myocardium during a cardiac cycle
Which condition results in an irregular and often rapid heart rate, leading to decreased blood flow?
Fibrillation
What is the formula for cardiac output?
(Heart rate) x (Stroke volume)
Which of the following conditions can lead to abnormalities or damage to the heart's structure?
None of the above
What is the term used to describe a heart rate of more than 100 beats per minute?
Tachycardia
What is the formula for calculating cardiac output?
(Heart rate) x (Stroke volume)
How is cardiac output regulated in the body?
By changing the heart rate
What factors can lead to an increase in heart rate?
High blood pressure
How does digitalis work in congestive heart failure?
It provides a slow and steady beat
What is the role of the parasympathetic nervous system in regulating heart rate?
Decreases heart rate
How often does the entire blood supply pass through the body?
Every 60 seconds
Learn about the cardiac cycle, which refers to the series of contractions and relaxations of the heart to produce a complete heartbeat. Understand the events during diastole and systole, including how the atria and ventricles function.
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