Heart

In air through the passageways to the lungs, by diffusion through the alveoli into the blood, by diffusion out of the blood into the cells and through the cells into the mitochondria - where it ceases to exist as oxygen and becomes water.

Yes it can happen and it is called Dextrocardia, in which case your appendix will also be on the left side instead of the right side .

The upper chambers of the heart are called the atria (singular: atrium).

A sheeps heart is slightly bigger than a sheeps kidney.

The heart is divided into 4 discrete areas comprising: Right ventricle (lower right hand side) Right atrium (upper right hand side) Left ventricle (lower left hand side) Left atrium (upper left hand side) Incidentally, the right chambers are separated by the Tricuspid Valve and the left chambers and separated by the Mitral Valve or more commonly Bicuspid Valve. Any easy way to remember these is: tRiscuspid (Right) bicuspid (Left)

It is a lymph node that is infected.Their are several of them in the neck area. If you scratch, have a pimple, or have a cold they will get larger and be sore. Often antibiotics are needed to get rid of the infection, and it sometimes takes a few weeks to go away.

aortic valve.

The wall between the left and right side of the heart is called 'Septum'.

Efficiency of the circulatory system when exchanging deoxygenated air for oxygenated air.

Because the heart was developed from tissues that makes it go to the left side.

The parts of the heart are::

Aorta

Pulmonary

Artery

Superior Vena Cava

Left Atrium

Right Atrium

Left ventricle

heart muscle

right ventricle

inferior vena cava

2 every 60 seconds

This happens thanks to the valves of the heart, located between the atria and ventricles. Between the left atrium and left ventricle we have the bicuspidal valve (aka mitral valve, latin: valva bicuspidalis/mitralis). Between the right atrium and right vetricle we have the tricuspidal valve (latin: valva tricuspidalis).

We also have semilunar valves (latin: valvae semilunares) located on the aorta and the pulmonary artery, that stope the backflow of blood from the vessels, back into the vetricles.

The six main risk factors for developing cardiovascular diseases are - cigarette smoking, high blood pressure, high blood cholesterol, diabetes, lack of exercise, and obesity. These are factors that can be controlled to lower your risk of suffering from a cardiovascular disease. There are other factors like age and family history that can also increase your chances of developing cardiovascular diseases and are beyond human control.

Dexoygenated blood being brought back to the heart from the body via veins enters the superior or inferior vena cava (largest vein) which empties into the right atrium, it passes through the tricuspid valve into the right ventricle, it then passes through the pulmonary valve into the pulmonary trunk to the left and right pulmonary arteries which carries blood to the left and right lungs where blood picks up oxygen and drops off carbon dioxide, it then returns through the right and left pulmonary veins into the left atrium then it passes through the bicuspid valve into the left ventricle, then passes through the aortic valve into the aorta and back to the rest of the body through arteries

The size of the human heart in any person is approximately the size of that persons fist. So if you are looking at your own fist that is about the size of your heart. Same size perspective can be used on a new born baby by looking at their hand and seeing what size their fist is. Since all humans are different sizes this is the easiest way to tell what approximate size that persons heart is regardless of age.

as boys enter into puberty and their testicles start to drop, one will naturally drop sooner than the other, hanging down lower, and growing larger first. this is perfectly natural and nothing to worry about.

-KtB-

The "anterooms" of the heart are also known as the atria.

Pariteal and Visareal.

The brain stem is what controls the heart rate. The heartbeat is triggered by electrical impulses that travel down through the SA (sinoatrial) node, AV (atrioventricular) node, and the His-Purkinje Network.

5 chambers

SA node and AV node

Well, the circultory system moves blood through out the body but it does not move the bones. THe muscular system is what moves bones.

Neither, they are one in the the same. Without your life your heart cannot function, and without your heart ,life is without meaning.