CVR 6 and 7

These two words, are the difference between maximum cardiac output and resting cardiac output

Cardiac Reserve
What are the 2 determinants of CO?
- Heart rate
- SV
What are the 3 determinants of SV?
- Preload
- Afterload
- Contractility
This is the load on a muscle in the relaxed state
- Preload
- It causes the muscle to stretch and develop passive tension
- Its basically End Diastolic Volume
This is the load on a muscle during contraction
- Afterload
- So left ventricular afterload is basically aortic pressure
This is a change in performance at a given preload

Contractility
What does the frequency-force relationship show?
- Increasing HR increases Contractility
- Because more Ca+ activates more cross-bridges
What does Starling's law say?
- More EDV --> greater force o contraction --> more SV--> more CO
This....This is Frank Starling
Equalization
Nerve supply to the Heart:

Author

Bobopudge

76404

Card Set

CVR 6 and 7

Description

nervous control of heart

Updated

2011-03-31T13:19:07Z

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