The Working Heart Flashcards
1
Q
Cardiac Efficiency
A
External Work/ Energy equivalent of O2 Consumption
2
Q
Inotropy
A
An intrinsic property of the heart muscle and is INDEPENDENT of preload or afterload
Depends on contractility of individual muscle fibers and amount of contractile, viable muscle
i.e. (Ca++ availability and sensativity)
3
Q
Lusitropy
A
Ability of the heart to relax
Depends on amount of available Ca and the rate that Ca is sequestered into SR
Cardiac myocyte passive tension role of titin
Presence of fibrotic and extracellular matrix in the heart
