Function of Myocardial cells
5 important questions on Function of Myocardial cells
What are the types of cardiac muscle fibers?
- Atrial
- Ventricular
- Excitatory and conductive muscle fibers
How do the different myocardial cells act?
Excitatory and conductive muscle fibers have
1. Rhythmic excitability (self-excitable)
2. Rapid conduction (to atrial and ventricular muscle)
What are properties of atrial and ventricular cardiac muscle?
- Joined by gap junctions -> intercalated discs, allowing free diffusion of ions with low resistance
- Excitation of 1 fiber leads to excitation of entire syncytium
- Higher grades + faster learning
- Never study anything twice
- 100% sure, 100% understanding
Why are atrial and ventricular syncytium separated?
What are the steps of excitation-contraction coupling in cardiac muscle?
2. Depolarization opens L-type Ca2+ channels
3. Ca2+ from ECF enters the cell
4. Calcium induced calcium release from sarcoplasmic reticulum's ryanodine receptors being activated
5. Calcium causes contraction
6. Ca2+ is pumped back to SR by SERCA pump
7. Ca2+ is pumped out of the cell via Na+/Ca2+ exchanger and Ca2+ ATPase
The question on the page originate from the summary of the following study material:
- A unique study and practice tool
- Never study anything twice again
- Get the grades you hope for
- 100% sure, 100% understanding

















