Heart parts. :) as soon as possible. PLEASE. :)?

Question

what is the function of the valves found in the heart?

What valves ensure the one-way flow of blood in right and in left sides of heart?

I need answers. ASAP. pleaaase! :) thanks to everyone.

good day :*

Answer 1

this is for homework that is due tomorrow aint it?

lol im only asking that i dont kbnow the answer, or i would have told you, o well, sorry

Answer 2

In humans, the function of the right side of the heart (see right heart) is to collect de-oxygenated blood, in the right atrium, from the body and pump it, via the right ventricle, into the lungs (pulmonary circulation) so that carbon dioxide can be dropped off and oxygen picked up (gas exchange). This happens through the passive process of diffusion. The left side (see left heart) collects oxygenated blood from the lungs into the left atrium. From the left atrium the blood moves to the left ventricle which pumps it out to the body. On both sides, the lower ventricles are thicker and stronger than the upper atria. The muscle wall surrounding the left ventricle is thicker than the wall surrounding the right ventricle due to the higher force needed to pump the blood through the systemic circulation.

Starting in the right atrium, the blood flows through the tricuspid valve to the right ventricle. Here it is pumped out the pulmonary semilunar valve and travels through the pulmonary artery to the lungs. From there, blood flows back through the pulmonary vein to the left atrium. It then travels through the mitral valve to the left ventricle, from where it is pumped through the aortic semilunar valve to the aorta. The aorta forks, and the blood is divided between major arteries which supply the upper and lower body. The blood travels in the arteries to the smaller arterioles, then finally to the tiny capillaries which feed each cell. The (relatively) deoxygenated blood then travels to the venules, which coalesce into veins, then to the inferior and superior venae cavae and finally back to the right atrium where the process began.

The heart is effectively a syncytium, a meshwork of cardiac muscle cells interconnected by contiguous cytoplasmic bridges. This relates to electrical stimulation of one cell spreading to neighboring cells.

The structure of the heart varies among the different branches of the animal kingdom. (See Circulatory system.) Cephalopods have two "gill hearts" and one "systemic heart". Fish have a two-chambered heart that pumps the blood to the gills and from there it goes on to the rest of the body. In amphibians and most reptiles, a double circulatory system is used, but the heart is not always completely separated into two pumps. Amphibians have a three-chambered heart.

Birds and mammals show complete separation of the heart into two pumps, for a total of four heart chambers; it is thought that the four-chambered heart of birds evolved independently from that of mammals.

In the human body, the heart is usually situated in the middle of the thorax with the largest part of the heart slightly offset to the left (although sometimes it is on the right, see dextrocardia), underneath the breastbone (see diagrams). The heart is usually felt to be on the left side because the left heart (left ventricle) is stronger (it pumps to all body parts). The left lung is smaller than the right lung because the heart occupies more of the left hemithorax. The heart is enclosed by a sac known as the pericardium and is surrounded by the lungs. The pericardium comprises two parts: the fibrous pericardium, made of dense fibrous connective tissue; and a double membrane structure containing a serous fluid to reduce friction during heart contractions (the serous pericardium). The mediastinum, a subdivision of the thoracic cavity, is the name of the heart cavity. [5]

The apex is the blunt point situated in an inferior (pointing down and left) direction. A stethoscope can be placed directly over the apex so that the beats can be counted. It is located posterior to the 5th intercostal space in the left mid-clavicular line. In normal adults, the mass of the heart is 250-350 g (9-12 oz), or about three quarters the size of a clenched fist, but extremely diseased hearts can be up to 1000 g (2 lb) in mass due to hypertrophy. It consists of four chambers, the two upper atria (singular: atrium ) and the two lower ventricles.

The valves of the heart were discovered by a physician of the Hippocratean school around the 4th century BC. However their function was not properly understood then. Because blood pools in the veins after death, arteries look empty. Ancient anatomists assumed they were filled with air and that they were for transport of air.

Philosophers distinguished veins from arteries but thought that the pulse was a property of arteries themselves. Erasistratos observed that arteries that were cut during life bleed. He ascribed the fact to the phenomenon that air escaping from an artery is replaced with blood that entered by very small vessels between veins and arteries. Thus he apparently postulated capillaries but with reversed flow of blood.

The 2nd century AD, Greek physician Galenos (Galen) knew that blood vessels carried blood and identified venous (dark red) and arterial (brighter and thinner) blood, each with distinct and separate functions. Growth and energy were derived from venous blood

Answer 3

Thin, fibrous flaps called valves lie at the opening of the heart's pulmonary artery and aorta. Valves are also present between each atrium and ventricle of the heart. Valves prevent blood from flowing backward in the heart.

I'm not sure what valves ensure it, but one of the valves found in the heart is the pulmonary valve, in which when the heart contracts, blood pressure builds and pushes blood up against the pulmonary valve, forcing it to open.As the heart relaxes between one beat and the next, blood pressure falls. Blood flows back from the pulmonary artery, forcing the pulmonary valve to close, and preventing backflow of blood.

It's all i can help.!

Answer 4

Basically valves ensure that blood does not flow back into the atria (atrium plural I think) from the ventricle before they are pumped out of the heart

the tricuspid is on the right

the mitral on the left

but I'm no cardiologist...

Answer 5

hi there!

The human heart consist of 4 valves these are the:

1. tricuspid valve

2. aortic valve

3. pulmonic valve

4. mitral (bicuspid) valve

Their main function of these valves are to prevent back flow (regurgitation) of blood from a heart chamber they already pass trough.

The tricuspid valve and mitral valve is called arterioventrivular valves because they are the valves which control the flow of both arteries and vantricular chamber.

While the aortic valve and pulmonic valve is called semilunar valves because their shaped like a  half moon and the valve consist of pocket liketlike semilunar cusps.

The tricuspid valve prevent back flow of blood from the right atrium to the right ventricle.

Same with the mitral valve which prevents back flow of blood from the left atrium to the left ventricle.

The pulmonic valve prevents reflux of blood from the right ventricle to the lungs. The aortic valve reprents backflow of blood from the left ventrilcle to the systemic circulation.

If any of the valve malfunction or became abnormal, smptomatic changes may occur like:

  1. right sided heart failure

       these may include liver enlargement (hepatomegaly), ascites (generalized edema). Always remember thart right sided failure is associated with organomegaly

  2. left sided heart failure

      these may include pulmonary edema ( fluid retention in the pleural cavity) causing difficulty of breathing) Left sided heart failure is always associated with the lungs.  

Did i help yah with your heart problem?