Cardiac muscle Flashcards
1
Q
Intercalated disks made of
A
Gap junctions, fascia adherens, desmosomes
2
Q
Right heart known as _ pump
Left heart known as _ pump
A
- Volume
- Pressure
3
Q
Cardiac nerves can be (2)
What does each innervate?
A
- Sympathetic(SA, AV, muscle)
- Parasympathetic(SA, AV)
4
Q
Inotropy:
Chronotropy:
Dromotropy:
A
- Contractility
- Heart rate
- AP conduction
5
Q
Sympathetic which NT?
Effects?
A
- Nor/epinephrine
- Increase Na+ If permeability, chronotropy, dromotropy
- Increase inotropy
6
Q
Parasympathetic which NT?
Effects?
A
- Ach(Muscarinic)
- Increase K+ permeability > decrease chronotropy, dromotropy
7
Q
Ca2+ release in cardiac muscle?
What is it called?
A
- 20% enter through slow voltage gated channels which triggers 80% through SR
- Calcium induced calcium release
8
Q
T-tubules in cardiac muscle store _
A
Ca2+
9
Q
In Pacemaker cells, AP due to _ depolarization
In non-pacemaker cells, AP due to _ depolarization
A
- Ca2+
- Na+
