contracting and relaxing to pump blood out of the heart and then to let the chambers refill. When blood leaves each chamber of the heart, it passes through a valve that is designed to prevent the backflow of blood. There are four heart valves within the heart: ...
heart,organthat serves as a pump tocirculatetheblood. It may be a straight tube, as in spiders and annelid worms, or a somewhat moreelaboratestructure with one or more receiving chambers (atria) and a main pumping chamber (ventricle), as in mollusks. Infishesthe heart is a folded tube,...
The structure of the heart becomes more complex due to the valves of the heart that are located at the exit of every chamber. Diagram of Heart Valves The first valve is thetricuspid valve. It gets its name because it has three cusps that anchor it down into the right ventricle. The tric...
Three- and four-chamber hearts have double circuits in their circulatory systems. One circuit is made when blood exits the heart, visits the lungs, and returns to the heart. A second circuit is made when blood leaves the heart, visits the tissues of the body, and returns to the heart. ...
As blood leaves each chamber of the heart, it passes through a valve. Heart valves There are four heart valves within the heart: Mitral valve Tricuspid valve Aortic valve Pulmonic valve (also called pulmonary valve) The tricuspid and mitral valves lie between the atria and ventricles. The ...
Right auricle receives deoxygenated blood from the body parts by anterior and posterior vena cava. The two thick walled lower chamber (right and left) are called ventricles. Right and left ventricles are separated by an inter-ventricular septum. The walls of left ventricle are mu...
A normal heart consists of 4 chambers – 2 atria and 2 ventricles. The main pumping chamber of the heart is the left ventricle. It pumps oxygenated blood up to the aorta to go right around the whole body and to be returned by veins to the right side of the heart and lungs to pick ...
Figure 7. Diagram (left) and corresponding echocardiographic apical 4-chamber image (right) showing the right ventricular (RV) basal (RVD1) and mid cavity (RVD2) RV minor dimensions and the RV longitudinal dimension (RVD3). The transducer is adjusted to focus on the RV chamber, with the ...
Diagram ( A ) and sonographic images ( B through F ) in the four-chamber view. The right- and left-sided chambers are symmetric in size. The atrioventricular valves have offset attachments ( dots in B-D) to the septum, with the tricuspid valve having more apical attachment than the mitra...
FIG. 3 is a block diagram of a four-chamber pacemaker with the ability to time multiplex impedance measurements, in accordance with this invention. FIG. 4 is a block diagram of a system implementation in accordance with an embodiment of this invention for controlling left ventricular pacing in...