12 Questions
What percentage of the resistance of the outside membrane do gap junctions in the myocardium have?
1/400
What is the main function of the pericardium?
To anchor the heart in place
What is the function of the atrioventricular node?
To transmit electrical impulses from the atria to the ventricles
How many main circulations does the human heart have?
Two
What is the name of the fibers that are part of the conductive system of the heart?
Purkinje fibers
How often does the heart beat in a day?
Over 100,000 times
What is the primary function of the Sinoatrial Node?
Generating the heart's electrical impulse
What is the primary ion responsible for the rapid depolarization during Phase 0 of the cardiac action potential?
Sodium
What is the effect of the parasympathetic nervous system on the heart?
Decreases heart rate
What is the duration of the absolute refractory period?
250 msec
Which ion is primarily responsible for the plateau phase (Phase 2) of the cardiac action potential?
Calcium
What is the effect of norepinephrine on the heart?
Increases heart rate
Learn about the functional anatomy of the heart, types of circulations, specialized cardiac tissues, and the action potentials of the heart. Understand the differences between cardiac and skeletal muscles and the refractory periods of the heart.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
