Dictionary » H » Heart valve

Heart valve

Definition

noun, plural: heart valves

(anatomy) Any of the valves of the heart that prevents the back flow of blood through its cusps or flaps of tissues


Supplement

In humans, there are four main valves of the heart: (1) left atrioventricular valve, (2) right atrioventricular valve, (3) aortic valve, and (4) pulmonary valve. The left and right atrioventricular valves are also called mitral valve and tricuspid valve, respectively. These atrioventricular valves are made up of cusps of tissues between the atria and the ventricles. They allow the passage of blood into the ventricles but prevent the blood flow back to the atria during systole. Blood back flow is prevented when the atrioventricular valves close as determined by pressure gradients.

The aortic valve and the pulmonary valve make up the semilunar valve. The aortic valve is located at the base of the aorta whereas the pulmonary valve is at the pulmonary trunk. When closed, they prevent the flow of blood from the arteries back into the ventricles. The closure of the aortic valve and the pulmonary valve produces the second heart sound.


See also:

Related term(s):


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



Results from our forum


biology need help??

Which of the following are true of coronary bypass or heart valve surgery? a. The risk of having a stroke following angioplasty is approximately 2.5% that of ...

See entire post
by zak
Fri Jan 10, 2014 1:32 pm
 
Forum: Human Biology
Topic: biology need help??
Replies: 0
Views: 1736

heart failure

... correct can someone help me thanks Consider the causes of left-sided heart failure: Choose one phrase from those available to correctly accompany, ... the metabolic demand by the tissues.) c. Stenosis of the mitral valve (causes damage to heart muscle.) d. Diabetes (is associated with weight ...

See entire post
by zak
Fri Nov 22, 2013 6:44 pm
 
Forum: Human Biology
Topic: heart failure
Replies: 2
Views: 4323

what causes us to breathe

... i did it in this way is that correct Consider the causes of left-sided heart failure: Choose one phrase from those available to correctly accompany, ... the metabolic demand by the tissues.) c. Stenosis of the mitral valve (causes damage to heart muscle.) d. Diabetes (is associated with weight ...

See entire post
by zak
Thu Nov 21, 2013 10:20 am
 
Forum: Human Biology
Topic: what causes us to breathe
Replies: 23
Views: 16433

Heart : Difference between tricuspid and bicuspid valves ?

Hi, at a guess, the tricuspid valve (separating the right atrium from the right ventriclel) has three cusps (flaps) simply because the diameter of the right side of the heart chambers are greater than the diameter of of the chambers on the left hand side, where ...

See entire post
by Julie5
Sun Oct 24, 2010 10:45 am
 
Forum: Human Biology
Topic: Heart : Difference between tricuspid and bicuspid valves ?
Replies: 3
Views: 34785

Heart : Difference between tricuspid and bicuspid valves ?

Could anyone tell me what the difference between tricuspid valve and bicuspid valve ( in function ) is, please ? I don't think those two valves are 'created' differently just for fun. What i think is the tricuspid valve is easier to open, then there could ...

See entire post
by superminh21
Fri Jan 22, 2010 10:08 pm
 
Forum: Human Biology
Topic: Heart : Difference between tricuspid and bicuspid valves ?
Replies: 3
Views: 34785
View all matching forum results

This page was last modified 06:51, 15 February 2015. This page has been accessed 3,827 times. 
What links here | Related changes | Permanent link