24 Questions
What is the function of Ca++ binding to troponin in the heart?
Allowing the myosin and actin cross bridge
What is the key purpose of the P wave in an electrocardiogram (ECG)?
Depolarization of the atria
Which component of an ECG is responsible for masking the repolarization of the atria?
QRS complex
What is the main role of an artificial pacemaker in cardiac physiology?
Ensuring effective heart contractions
If someone has a heart block, what type of interruption occurs in their heart's conduction pathway?
Interruption in conduction pathway
Which region of the heart would fire at 80 - 100 times per minute if not for endocrine control?
SA node
What is the function of atria in the heart?
Collect blood and push it into lower chambers
Where is the pericardium located in the heart?
Between the lungs in the mediastinum
Which structure connects the right ventricle to the pulmonary trunk?
Pulmonary artery
What is the function of the great veins and arteries attached at the base of the heart?
Deliver oxygenated blood to the body
Which layer of the heart produces lubricating fluid for smooth movement?
Visceral layer of Serous Pericardium
What is the main function of auricles in the heart?
Hold blood and empty into atria
Which layer of the heart is continuous with the lining of the blood vessels?
Endocardium
What separates the atria from the ventricles in the heart?
Tricuspid valve
What is the function of semilunar valves in the heart?
Separate ventricles from blood vessels
Which chamber of the heart receives oxygenated blood from the pulmonary veins?
Left atrium
What term describes the interconnections of blood vessels that allow blood to flow even if there is a partial blockage?
Anastomosis
Which type of cells in cardiac muscle initiate and propagate the action potential through the heart?
Myocardial conducting cells
What is the main function of desmosomes in cardiac muscle cells?
Prevent cells from ripping apart
Where is the sinoatrial (SA) node located in the heart?
Superior and posterior wall of the right atrium
What happens when Na+ channels close at +30mV in cardiac contractile cells?
+30mV repolarization starts
What is the primary function of Purkinje fibers in cardiac conduction?
Spread impulses around ventricles.
How do semilunar valves close?
Due to papillary muscles.
What is T tubule distribution like in cardiac muscle cells?
Located only at Z discs.
Test your knowledge on heart anatomy with this quiz covering the key points from Chapter 19.1 of the book. Questions may include topics such as heart structure, location, and major blood vessels attached to the heart.
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