Dictionary » P » Preload



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

Please contribute to this project, if you have more information about this term feel free to edit this page

Results from our forum

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

See entire post
by IndoorKid
Mon Mar 24, 2008 12:09 pm
Forum: Physiology
Topic: Couple of question about muscle contraction
Replies: 1
Views: 3982

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 ...

See entire post
by Revenged
Sat Feb 24, 2007 10:47 pm
Forum: Cell Biology
Topic: Na/K ATP-ase Reversal
Replies: 5
Views: 5432

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.

See entire post
by cardiorrhexis
Sat Mar 11, 2006 3:54 pm
Forum: Human Biology
Topic: Heart beat ~ B.P.
Replies: 2
Views: 1775

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....

See entire post
by cardiorrhexis
Fri Feb 17, 2006 6:31 pm
Forum: Human Biology
Topic: homeostatic control of blood pressure
Replies: 1
Views: 4583

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 ...

See entire post
by sdekivit
Wed Jan 04, 2006 3:42 pm
Forum: Human Biology
Topic: sympathetic stimulation
Replies: 5
Views: 8264

This page was last modified 21:16, 3 October 2005. This page has been accessed 7,277 times. 
What links here | Related changes | Permanent link