18 Questions
What is the role of the cardiac muscle in the circulatory system?
To produce a squeezing action and ensure the heart can contract effectively.
Explain the significance of sarcomeres in cardiac muscle cells.
Sarcomeres are the contractile units that enable muscle contraction.
How do intercalated discs contribute to the function of cardiac muscle?
They facilitate synchronized contraction between muscle cells.
What is the purpose of the cardiac cycle?
To circulate blood around the body through a sequence of heart contractions and relaxations.
How does the cardiac cycle contribute to maintaining blood pressure?
By regulating the sequence of contraction and relaxation of heart chambers.
Describe the role of valves in the cardiac cycle.
Valves open and close due to pressure changes to direct blood flow through the heart.
What is the role of the Sinoatrial Node (SAN) in the cardiac cycle?
The SAN is a natural pacemaker that initiates the cardiac cycle by sending out regular waves of depolarization to the atrial walls.
How does the AV Node contribute to the cardiac cycle?
The AV Node delays the electrical impulse by about 0.1 seconds to allow time for the ventricles to fully contract.
Explain how the Bundle of His is involved in the cardiac cycle.
The Bundle of His conducts the electrical wave to the bottom of the heart's septum.
What is the function of the Purkinje fibers in the cardiac cycle?
The Purkinje fibers spread the electrical wave through the ventricle walls, causing efficient contraction from the bottom up.
Why is the cardiac muscle considered myogenic?
The cardiac muscle is myogenic because it can initiate its own contraction and relaxation without signals from nerve cells.
How does the pressure change in the heart chambers during the cardiac cycle?
The atria fill with blood, increasing their pressure. The ventricle pressure falls below the atria pressure, forcing open the AV valve.
What is the significance of P wave in an ECG?
Atrial Systole/Contractions
Define Bradycardia.
Heart rate drops below 60 beats per minute
Explain the cause of Tachycardia.
More than 100 beats per minute
What is an Ectopic Heart beat?
Extra heart beat different from the normal pattern
Describe Atrial Fibrillation.
Irregular waves of electrical excitation over atria
What is the function of Hemoglobin in the blood?
Transport oxygen
Test your knowledge on the cardiac cycle, including the filling of atria with blood, pressure changes in the ventricles, functioning of AV valves, and the role of myogenic cardiac muscle. See how well you understand the process of a cardiac cycle lasting about 0.8 seconds.
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