Control of the cardiac cycle
- Created by: Kelly Davies
- Created on: 23-11-12 16:22
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- Control of the cardiac cycle.
- Nodes
- AVN
- only route through the non-conducting tissue.
- Wave is delayed. So atria can finish contracting.
- only route through the non-conducting tissue.
- SAN
- generates electrical activity
- 55-80 times a minute
- Pacemaker
- generates electrical activity
- AVN
- heart muscle
- cardiac muscle
- myogenic
- can initiate its own contraction
- EGC (electrocardiogram)
- How it works?
- sensors attached. Electrical activity spreads next to the heart and to the skin. This is knew converted to a trace.
- Waves
- P
- excitation of atria
- Q,R S
- Excitation of ventricles
- T
- diastole
- P
- Problems detected.
- heart attack
- myocardial infarction
- How it happens?
- heart respires fattty acids. These can only respire aerobically. If coronary artery is blocked then part of heart is starved and the cells die.
- fabrillation
- irregular heart
- arrhythmia
- heart attack
- How it works?
- Nodes
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