Chapter 11: Overview of the Heart Flashcards
Central cavity of the thorax
Mediastinum
What percentage of the heart mass lies left of the midsternal line?
2/3
What does the heart rest on?
the diaphragm
Lower pointed part of the heart that points to L hip
apex
What is the average HR throughout life?
72-75 BPM
Double walled sac that encloses the heart,
forms an outer layer of tough connective tissue
pericardium
Outermost layer of the heart; it is the outer layer of connective tissue covering the myocardium and coronary arteries, and it overlies a little loose fibrous
and adipose tissue. It is also the inner (visceral) layer of the pericardium (which
covers the myocardium)
Epicardium
Middle layer of the heart; it is the thickest layer and is muscular; the workhorse of the heart.
Myocardium
Innermost layer of the heart, forms a smooth membrane
of endothelial cells lining the cardiac chambers and covering the
surfaces of the heart valves
Endocardium
What are the layers of the pericardium?
Outer = fibrous pericardium Middle = Serous pericardium Inner = Epicardium (visceral epicardium)
True or false: There is normally a channel for direct communication between the R and L sides of the heart.
False
What separates the R and L chambers of the heart?
Septum (one between the atria and one between the ventricles)
Which half of the heart is the pulmonary pump (sends blood into pulmonary arteries)?
Right
Which half of the heart is the systemic pump?
Left
What separates the atria and ventricles and surrounds and provides structural support for the heart valves?
Dense fibrous tissue (a fibrous framework)