19 Questions
What is the unique feature of the pulmonary artery in terms of the blood it carries?
It carries deoxygenated blood
Which layer of the heart produces lubricating fluid?
Epicardium
Where is the base of the heart located in relation to the apex?
Superior and medial
What is the function of the ventricles in the heart?
Pump blood out to the body or lungs
What is located within the sulci of the heart?
Fat-filled grooves that contain coronary blood vessels
How many auricles are present in a typical heart and what is their function?
Two; Hold blood and empty into atria
What happens at 0mV in the heart cells based on the provided information?
Ca++ channels close and K+ channels open
Which component of the heart's electrical activity is responsible for depolarization of the ventricles?
QRS complex
What is the role of troponin in the heart muscle contraction process?
Facilitates cross-bridge formation between actin and myosin
Which of the following components is responsible for repolarization in the heart's electrical activity?
T wave
If the SA node fires at a rate of 90 times per minute, what would be the expected rate of firing of the atrioventricular bundle based on the information provided?
30 - 40 times per minute
What is the function of an artificial pacemaker in managing heart conditions?
Delivers electrical impulses to ensure effective heart contractions
Which heart chamber has a small contractile phase and contains pectinate muscles?
Right atrium
What makes an audible sound as they close according to the text?
Semilunar valves
What is the function of desmosomes in cardiac muscle cells?
Stop the cells from ripping apart
What initiates and propagates the action potential through the heart?
Myocardial conducting cells
Where is the Sinoatrial (SA) node located?
Right atrium
In cardiac conductive cells, which channels allow a slow influx of Na+ to create spontaneous depolarization?
Ca++ channels
What is the total time from initial impulse to ventricle depolarization approximately according to the text?
~225 ms
Test your knowledge on the anatomy of the heart, including its location, structure, and major blood vessels. Questions cover key concepts such as the mediastinum, pericardium, pericardial cavity, and base of the heart.
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