Valves of the heart, Biology

Assignment Help:

Valves of the Heart

There are four valves which are flap-like structures that function to maintain unidirectional (forward) blood flow through the heart chambers. These valves open and close in response to pressure and volume changes within the cardiac chambers. There are two atrio-ventricular valves which separate the atria from the ventricles and two semi-lunar valves which separate the pulmonary artery and the aorta form their respective ventricles.

Atrio-ventricular valves are the tricuspid and bicuspid (mitral) valves. The tricuspid valve located between the right atrium and right ventricle contain three leaflets held in place by fibrous cords called chordae tendinae. The chordae tendinae in turn are anchored to the ventricular wall by the papillary muscles.

The bicuspid or the mitral valve located between the left atrium and left ventricle has two valve cusps or leaflets. It is attached in the same manner as the tricuspid valve. The chordae tendinae support the valves during ventricular systole to prevent valvular porlapse into the atrium. Damage to the chordae tendinae or to the papillary muscles would permit blood to regurgitate into the atrium during ventricular systole. AV valves are closed during ventricular systole and open during ventricular diastole.

The semi-lunar valves consist of three cup-like cusps. They lie between each ventricle and the great vessels into which it empties. These valves can open during ventricular systole to permit blood flow into aorta and pulmonary artery and closed during diastole to prevent retrogarde flow form the aorta of pulmonary artery back into the ventricles when it is relaxed.

 


Related Discussions:- Valves of the heart

Making leaf collections, Making leaf collections Collect young leaves o...

Making leaf collections Collect young leaves of as many varieties of plants as possible. Place various layers of news- paper or blotting paper on a firm, smooth board. Next org

Is a viral infection treated with drug, Q. Is a viral infection treated wit...

Q. Is a viral infection treated with the same kind of drug that treats bacterial infections? The Antibacterial drugs, potent against a great variety of bacteria, are not effect

Explain about the optic disc, Explain about the optic disc The optic di...

Explain about the optic disc The optic disc is also called a blind spot while the macula is referred to as the yellow spot. The ora serrata (the intersection between the retina

Mixed mitral stenosis and regurgitation, Mixed Mitral Stenosis and Regurgit...

Mixed Mitral Stenosis and Regurgitation The most common cause for a combined lesion is rheumatic, Very rarely; it could be of congenital origin. Regurgitation in a stenotic val

What do you mean by overgloves, Q. What do you mean by Overgloves? The ...

Q. What do you mean by Overgloves? The purpose of these gloves is to use time more efficiently and to protect the skin on the hands through minimizing the number of times that

What is the importance of that structure in menstrual cycle, What is the st...

What is the structure into which the follicle is transformed after ovulation? What is the importance of that structure in the menstrual cycle? The follicle that released the ov

Which keel is characteristic of the flowers, Keel is characteristic of the...

Keel is characteristic of the flowers of : 1. Gulmohur 2. Cassia 3. Calotropis 4.  Bean Bean

Objection, i have question that all scientist agree that the basic unit off...

i have question that all scientist agree that the basic unit off life is a cell and scientist said this to be a cell theory... and they also said that if a theory survive continuou

What is ascending aortic aneurysm, What is Ascending Aortic Aneurysm ? ...

What is Ascending Aortic Aneurysm ? Ascending Aortic Aneurysm :  In aneurysms confined to ascending aorta well below the innominate artery origin, the technique used is

Why does the ingestion of alcohol increase diuresis, Q. Why does the ingest...

Q. Why does the ingestion of alcohol increase diuresis? Alcohol inhibits the secretion of ADH that is antidiuretic hormone by the pituitary that is why when it is drunk to exce

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd