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Physiology of the cardiovascular system.
hapter 1 
5 
Mechanism o(heart benting 
TYPES OF CARDIAC MUSCLE FIBRES 
(A) Contractile cardiac muscle fibres (99 %) 
These are the libres that constitute the atrial and l'entricular 111alls. 
They are characterized by the following : 
(1) They branch and interdigitate (ligure 3). hut eachjibre is a separate 
cell surrounded by a cell membrane (the sarcolemma). 
(2) They arc stiated like skeletal muscles and also contra<.:t by a similar 
mechanism. They contain actin. myosin, tropo...
- Class notes
- • 160 pages •
hapter 1 
5 
Mechanism o(heart benting 
TYPES OF CARDIAC MUSCLE FIBRES 
(A) Contractile cardiac muscle fibres (99 %) 
These are the libres that constitute the atrial and l'entricular 111alls. 
They are characterized by the following : 
(1) They branch and interdigitate (ligure 3). hut eachjibre is a separate 
cell surrounded by a cell membrane (the sarcolemma). 
(2) They arc stiated like skeletal muscles and also contra<.:t by a similar 
mechanism. They contain actin. myosin, tropo...