Heart

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diastylic

One easy way to lower your risk for heart disease is to keep your cholesterol in balance. Most people's LDL ("bad") cholesterol, HDL ("good") cholesterol, and triglycerides ("trigs") are way out of balance. Try to keep your LDL levels low.

clarify yolk

One heart beat occurs in 3 main stages. Firstly, Diastole occurs. This is where the atrial walls relax, and blood flows into the atria. The atrioventricular valves are open, and semi-lunar valves stay closed.

Next, Atrial Systole happens, where the atrial walls contract, forcing the atrioventricular valves open even more, and blood is forced into the ventricles. Semi-lunar valves stay closed.

Finally, Ventricluar Systole occurs. The ventricles contract, and semi-lunar valves open, whilst atrioventricular valves close, allowing blood to be forced into the Aorta and Pulmonary Artery :)

The resistance against which the ventricle contracts is know as afterload.

its called ambidextrous, that's what i am :)

Fodder Development is an specialization of Animal Husbandry and very often is a subject practiced by Livestock Assistants. You should study for a Certificate in Animal Husbandry or in Animal Care, depending of which is your country of residence.

The atria.

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Scientifically known as Chordinae Tendinae, these are tendons responsible for linking the papillary muscles to the tricuspid valve in the right ventricle and the mitral valve in the left ventricle. As the papillary muscles contract and relax, the chordae tendineae transmit the resulting increase and decrease in tension to the respective valves, causing them to open and close.

Cardiac muscle is a type of involuntary striated muscle found in the walls of the heart, particularly the myocardium. Cardiac muscle cells are identified as cardiac myocytes or cardiomyocytes. Cardiac muscle is one of three major types of muscle, the others being skeletal and smooth muscle. Cardiac muscle, different from skeletal muscle, is composed of separate cellular elements. A cardiac muscle cell has a large nucleus and numerous mitochondria. The elevated concentration of mitochondria reveals the huge energy burden that predominant the heart. Contractile proteins of actin and myosin myofilaments are in the cytoplasm. They form bands of varying density. The heart produces regular electrical impulses causing the muscle myofibrils to glide above one another and squeeze the cardiac muscle.

Some cardiac cells are self-excitable, contracting devoid of any signal from the nervous system. Each of these cells have their own inherent contraction rhythm. A section of the human heart called the sinoatrial node, or pacemaker, sets the rate and timing that all cardiac muscle cells contract. The SA node generates electrical impulses, from the SA node spreading rapidly through the walls of the artria, causing both artria to contract in unison. The impulses also pass to another section of specialized cardiac muscle tissue, a convey point called the atrioventricular node AV bundle or artioventricular bundle or Bundle or His. This collection of heart muscle cells are also specialized for electrical conduction that transmits the electrical impulses from the AV node to the point of the apex of the fascicular branches. The fascicular branches then lead to the Purkinje fibers then conduct the signals to the apex of the heart along and throughout the ventricular walls. The Purkinje fibers form conducting pathways called bundle branches.

2 of these valves (one on each side) stop blood from flowing back into the atria chambers of the heart when the heart is contracting and expelling blood.

The other two are there to stop blood flowing out of the ventricles when the heart is filling up with blood. One stops blood flowing through the aorta to supply the body and the other stops it flowing through the pulmonary artery to the lungs.

there's nothing like a open heart surgeon as a speciality.But cardiosurgeons are the doctors who perform the open heart surgery.It's a kind of surgery in which the cardio surgeon cut open your thoracic cavity ,and performs your heart's surgery while bringing it to rest for some period of time.That's it.

The ribs, I guess. She guessed right. The ribcage is the collection of bones that protects the organs of the thorax including the heart. More specifically the sternum, the "breast bone" directly covers and protects the heart.

William Harvey theorized that humans and other mammals must reproduce through the joining of an egg and sperm. It took approximately 200 years until this theory could be confirmed by observation. It may seem very obvious to our eyes today, but..... Harvey lived from 1578-1657 and the first microscope was not invented until 1674

http://www.answers.com/William+Harvey

http://www.answers.com/topic/microscope-technology

It is called Atrial Fibrillation

No. The lower chambers of the heart are called the ventricles. The atria are the top chambers of the heart.

Its my be you are not yet mature enough to start the romance business. or you not yet sure if the girl is ready for that business

an average adult human heart weighs approximatly female: 9 ounces male: 10.5 ounces

endocardium

Any class of vertebrate with a three-chambered heart has two atria and one ventricle. An example would be amphibians such as frogs.

The heart beat can increase due to stress and exercise. There are many other factors that can increase heart rate.

The human body only has one heart, situated between the lungs. The heart pumps blood around the body, and is quite remarkable as a muscle because it never tires.

Blood is pumped throughout the body by the heart through arteries. The "Used" blood is further pumped back to the heart through veins. 'Veins' is your answer.