the wall of a vein is much thinner them that of an artery because the middle layer of muscle and elastic fibers is thinner. Within some veins, valves allow blood to flow only toward the heart when they are open and prevent the backward flow of blood when they are closed....
Diseases of the heart valves include: Endocarditis.This is an infection that's usually caused by bacteria, which may enter the blood and take root in your heart during illness, after surgery, or after using intravenous drugs. It often happens if you already have valve problems.Antibioticscan us...
Characteristics and types of artificial heart valvesDaurova, T TBykov, G ARozanova, I B
Other forms of heart disease can be caused by weak heart muscle, heart infections, or diseases of the heart valves. How is heart disease diganosed? Five symptoms can indicate when someone is having a heart attack and requires immediate emergency care, calling 911. These include pain in the ...
a在查询阶段 In inquiry stage[translate] areborns reborns[translate] abeing body mist 是身体薄雾[translate] aA valid license issued by a competent authority, stating that the company is licensed to produce Valves of the specified standard, characteristics and type must be attached to the tender....
3. Heart disease affecting heart valves These type heart diseases occur when the mitral valve in the heart is narrowing causing the heart to work harder to pump blood from the left atrium into the ventricle. The mitral valve does not close properly and prolapse occurs or narrowing of the aort...
The heart is a two-stage electric pump whose job it is to circulate blood through the body. The initial electrical impulse that begins the process of a heartbeat is generated by a group of cells located in the upper chamber of the heart, the atrium. These cells act as an automatic pacem...
and returns them to the liver and kidney for further processing and excretion, Theheartis composed of cardiac muscle, specialised conductive tissue, valves,blood vessels&connective tissue.It is comprised of specialized conductive tissue that can generate an action potential indep...
Cardiovascular diseaseis a group of conditions that affect your heart and blood vessels. It's sometimes also called heart disease. Conditions that affect your heart and blood vessels can include problems you're born with, heart valves that don't work they way they should, and irregular heart ...
In broad strokes, the heart has four chambers (two ventricles and two atria), muscle, lining, an electrical system, valves, and coronary arteries and veins. Heart disease may be defined by what part of the heart it mostly affects. Disease of the chambers include many forms of congenital ...