1) intro to heart and circulatory system
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9 Terms
What are the three layers of the heart wall?
Epicardium, myocardium, and endocardium.
What is the function of the myocardium?
It’s the muscular layer responsible for heart contractions.
Which chamber of the heart pumps oxygenated blood to the body?
Left ventricle
Trace the flow of blood starting from the right atrium.
Right atrium → right ventricle → pulmonary arteries → lungs → pulmonary veins → left atrium → left ventricle → aorta → body
What prevents backflow of blood in the heart?
Heart valves (tricuspid, pulmonary, mitral, and aortic).
What initiates the heartbeat?
The sinoatrial (SA) node.
What is the role of the AV node?
It delays the signal to allow the atria to contract before the ventricles.
Which part of the brain regulates heart rate?
Medulla oblongata.
What effect does the sympathetic nervous system have on the heart?
It increases heart rate and force of contraction.
Note 
Flashcards (79)