Chapter 19 Flashcards
Where is the heart located ?
Inside the mediastinum of the thoracic cavity
Which chamber of the heart receives deoxygenated blood from the systemic circuit?
Right atrium
What is the role of the pulmonary circuit?
Transport deoxygenated blood to the lungs and return oxygenated blood to the heart
What structure serves as the pacemaker of the heart?
SA node
Which valve prevents backflow of blood into the left ventricle?
Aortic valve
The heart is surrounded by a membranous sac called the ___________ which reduces friction as the heart beats.
Pericardium
The ____________ are pouch-like extensions of the atria that allow them to
accept extra amounts of blood.
Auricles
The interventricular septum separates the two _________ of the heart.
Ventricles
The ____________ circuit transports oxygenated blood to systemic tissues and
returns deoxygenated blood to the heart.
Systemic
Action potentials are initiated in the heart by specialized cells in the _______ node, also known as the pacemaker of the heart.
Sa
Why does the left ventricle have a thicker myocardium compared to the right ventricle?
It must overcome the increased resistance of the systemic circuit
What is the function of the chordae tendineae?
Anchor the AV valve cusps to the papillary muscles
Which statement is true of all four valves of the heart?
All valves prevent back flow of blood
