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Preload

preload

(Science: cardiology, physiology) The tension in the heart muscle or chamber at the end of diastole, before the contraction.


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Couple of question about muscle contraction

... repeatedly what happens to the force of contraction? and what is the mechanism behind this event finally -what happens to muscle at the highest preload forces. I've had to do a bunch of questions on this and these are the 3 that i just can't answer. Hope someone can help

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by IndoorKid
Mon Mar 24, 2008 12:09 pm
 
Forum: Physiology
Topic: Couple of question about muscle contraction
Replies: 1
Views: 3732

Na/K ATP-ase Reversal

... can prevent the heart working as hard... e.g. beta blockers (reduce b1 adrenoreceptor activation), nitric vasodilators (venous dilation, reduce preload), calcium receptor antagonists (e.g. verapamil reduced afterload)...etc. but cardiac glycosides like digoxin increase heart workload... doesn't ...

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by Revenged
Sat Feb 24, 2007 10:47 pm
 
Forum: Cell Biology
Topic: Na/K ATP-ase Reversal
Replies: 5
Views: 4592

Heart beat ~ B.P.

asutoshsahu, Are you thinking of Frank-Starling Law? Preload + Contractility = Afterload Basically...the volume entering the heart in addition to the efficacy of contractions is going to determine your systemic perfusion dynamics.

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by cardiorrhexis
Sat Mar 11, 2006 3:54 pm
 
Forum: Human Biology
Topic: Heart beat ~ B.P.
Replies: 2
Views: 1624

homeostatic control of blood pressure

... and dopamine...your sympathetic and parasympathetic nervous systems play a role in BP too...as well as plasma and Na+ .....and even the heart...preload, contractility, stroke volume.... There are many factors involved with regulating BP....

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by cardiorrhexis
Fri Feb 17, 2006 6:31 pm
 
Forum: Human Biology
Topic: homeostatic control of blood pressure
Replies: 1
Views: 4417

sympathetic stimulation

Starling's law says that the force of contraction increases when preload increases. But a sympathetic inpulses increases, also (nor)adrenalin is produced in the adrenal gland. And these will cause the increased contraction in the heart. This is because when ...

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by sdekivit
Wed Jan 04, 2006 3:42 pm
 
Forum: Human Biology
Topic: sympathetic stimulation
Replies: 5
Views: 7640


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