24 Questions
What is the volume of fluid that the heart pumps per minute?
5.25 L
Where is the heart located?
In a space called mediastinum
Which chamber of the heart connects to the pulmonary trunk?
Right ventricle
What is the function of the atria in the heart?
Collect blood and push it into lower chambers
Which layer of the heart is described as the 'middle thickest layer'?
Myocardium
Which of the following vessels is the only artery to carry deoxygenated blood?
Pulmonary artery
What happens at 0mV in terms of ion channels?
Ca++ channels close and K+ channels open
What is the role of Ca++ in muscle contraction?
Ca++ binds to troponin to allow myosin and actin cross bridge
At what rate would the AV node fire if not for endocrine control?
40 - 60 times per minute
What is the function of an Artificial Pacemaker?
Deliver electrical impulses for effective heart contractions
Which part of the ECG represents the repolarization of the ventricles?
T wave
What is the purpose of Abbreviated ECG or EKG with 12 leads?
To monitor electrical signals of the heart more comprehensively
What is the function of endothelins released by the endothelium?
Regulating growth patterns of cardiac muscle cells
Which valves separate the atria from the ventricles?
Atrioventricular valves
What is the function of the moderator band?
Assists in cardiac conduction
What is the purpose of the fossa ovalis?
Allow blood flow during fetal circulation
Which of the following statements is true about coronary circulation?
Arteries branch off the aorta near the ventricles.
What is the primary function of myocardial conducting cells?
Initiate and propagate action potentials through the heart
Where are T tubules found in cardiac muscle cells?
At Z discs
What is the role of desmosomes in cardiac muscle cells?
Prevent cardiac muscle cells from separating
What is the function of Purkinje fibers in the heart?
Conduct impulses throughout the ventricles
What occurs during the plateau phase in cardiac contractile cells?
Sarcoplasmic reticulum releases Ca++
What is the main function of the Bundle of His?
Impulse conduction to ventricles
What is an essential role of gap junctions in cardiac muscle?
Ion exchange between cells
Test your knowledge on the anatomy of the heart in Chapter 19 of 'The Cardiovascular System: The Heart'. Learn about the location, structure, and functions of the heart, as well as its surrounding structures and cavities.
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