Heart histology Flashcards
where is smooth muscle found
in walls of hollow contracting organs
blood vessels
urinary bladder
respiratory tract
digestive tract
reproductive tract
where is cardiac muscle found
heart
where is skeletal muscle found
large body muscles responsible for movement
structure of smooth muscle tissue
cells are short, spindle shaped and non striated
single central nucleus
function of smooth muscle
moves flood, urine and controls diameter of respiratory and blood vessels
structure of cardiac muscle
cells = short, branched, striated
single nucleus, cells are interconnected by intercalated discs
cardiac myocytes = branches
function of cardiac muscle
circulates blood
maintains BP
structure of skeletal muscle
cells = long, cylindrical , striated, multinucleate
functions of skeletal muscle
moves and stabilises the position of the skeleton, guards entrance and exits to digestive, respiratory and urinary tracts, generates heat, protects organs
physical association between T tubule and SR = excitation wave directly couple with SR where an excitation wave directly couple with the SR
PACE
preload
afterload
contractility
hEart rate
preload
volume of blood in heart prior to contraction
afterload
load against which the heart has to contract to eject the blood
contractility
the relative ability of the heart to eject a stroke volume (SV) at a given prevailing afterload (arterial pressure) and preload (end-diastolic volume; EDV).
Pressure - volume relationship of the left ventricle
- isovolumetric contraction
- LV ejection
- isovolumetric relaxation
- LV filing
stroke volume equation
volume of blood pumped out of the left ventricle of the heart during each systolic cardiac contraction.
SV= EDV-ESV
end diastolic volume - end systolic volume