Heart

Of course not. Your heart has nothing to do with sneezing. That's just a ridiculous myth. People only say "Bless You" to be polite.

The left side of the heart pumps oxygenated blood.

The junction of the Superior and Inferior Vena Cavae. The Superior Vena Cava brings blood from the upper body, and the Inferior Vena Cava brings blood from the lower body. They meet at a junction, and enter the heart.

The heart rests between each beat. As long as the myocardium (heart muscle) receives sufficient oxygenated blood and maintains a proper rhythm, it can (and must) perform this beat/rest cycle throughout and organism's entire life.

the septum seperates the left and right ventricles

The pacemaker of the heart is known as the sinoatrial (SA) node. It sets the rate at which the heart will beat without any autonomic stimulation, that is, no sympathetic or parasympathetic activity. Increases in sympathetic activity will increase the heart rate while increases in parasympathetic activity decrease heart rate. The pacemaker of the heart is known as the sinoatrial (SA) node. It sets the rate at which the heart will beat without any autonomic stimulation, that is, no sympathetic or parasympathetic activity. Increases in sympathetic activity will increase the heart rate while increases in parasympathetic activity decrease heart rate. The pacemaker of the heart is known as the sinoatrial (SA) node. It sets the rate at which the heart will beat without any autonomic stimulation, that is, no sympathetic or parasympathetic activity. Increases in sympathetic activity will increase the heart rate while increases in parasympathetic activity decrease heart rate.

What you feel in your wrist is a pulse. The pulse is caused by the heart pumping blood round your body.

There are many things that you can do to reduce your risk factor for getting heart attacks. Get plenty of exercise and water, stay away from packaged processed foods or foods with a high sodium content, eat foods with Omega-3 fatty acids such as salmon or avocados, drink a glass of red wine every evening, take daily aspirin (ask your doctor if this is ok first), and test your blood pressure and cholesterol levels often.

I think you are talking about the Aorta.

The blood in the left atrium comes from the pulmonary vein, that is, from the lungs. It's oxygenated blood, innit?

The blood in the right atrium comes from the vena cava (either superior or inferior) which actually takes deoxygenated blood from the body into the heart, where it is later sent to the lungs for oxygenation... and so on.

LBBB usually happens as a consequence of other diseases such as arteriosclerosis, rheumatic fever, congenital heart disease, myocarditis, myocardial infarction, metastatic heart tumors, or other invasions of the heart tissue.

Two pulmonary veins empty blood into the left atrium.

Deoxygenated blood enters the right atrium, then the right ventricle which pumps the blood to the lungs where it is oxygenated. The two pulmonary veins then take the newly oxygenated blood back to the heart through the left atrium and into the left ventricle which then pumps the oxygenated blood around the rest of the body.

The tissue of the heart is composed of three major layers:

The outer most is the Epicardium. "Epi" refers to "outside"

The inner most layer is the Endocardium. "Endo" refering to "inside"

The layer in between is called the Myocardium. It is the thickest layer and is composed of cardiac muscle. Thus its name, as "myo" is a prefix meaning "muscle".

gorillas have a heart with 4 chambers and a blood system that uses hemoglobin

a lower part of the heart

The heart is located in the mediastium thoracic cavity, slightly left of the midline.

Use the R-R interval. Cardiac cycle time = heart rate. R wave marks the reliable point on the ECG of ventricular depolarisation thus unlike atrial depolarisation (P-wave) it is less susceptable to conduction delays etc / heart block which can alter the cycle time (for example 2nd degree heart block where the P-R interval increases then is missing then restarts). Even if there is complete heart block or irregularly irregular rhythms such as atrial fibrillation the R-R interval will show the heart rate. This is due to the intrinsic rhythmicity of the ventricles and its ability to become it's own pacemaker in times of need :D

R-R interval / time = the electrical reflection of heart rate. NB: this tells you nothing about rhythm. for this you'd need to assess the P-R interval which tells you more about the relationship between the atria and the ventricles. also if you want to see HOW the electrical discharge spreads you'd have to look at the P-QRS-T components individually.

The reason why you wouldn't use the P-T interval is because it varies so much even in normal individuals with sinus arrhythmia. also it does not take into account the refractory phase of the cardiac cycle.

Hope this helps.

Sources: Hampton's ECG made easy, Lecture notes on cardiology

There are two nodes that can act as pacemakers for the heart and initiate contraction. In a normal healthy heart, the SA (sinoatrial) node acts as the pacemaker by depolarizing spontaneously ~60-80 times per minute. If damaged, the AV (atrio-ventricular) node can take over this function but does not depolarize as quickly, so the resting heart rate would be lower (40-50 times per minute).

No, it flows from the Right Atrium to the Right Ventricle then to the Left Atrium to the Left Ventricle. Hope this helps!

Upper chambers of heart are the left and right atrium

Lower are the left and right ventrical

atrioventricular valves separate the two.

Bicuspid (mitrial) valve separates the left atrium/ventrical and the tricuspid separates the right atrium/ventrical.

when you exercise then the blood in your body flows faster and the heart pumps the blood at a faster pace to get the oxegenated blood to move throughout your body. with out this oxegenated blood moving throught your body your muscles will stop working.if our blood flowed normally then it would take longer for the blood to reach your muscels and and they would respond slower.

first, to answer this question one must understand what a stroke is. A stroke isa sudden atteck of weakness affecting one side of the body. It is the consequence interruption to blood flow to the brain and this can be due to so many conditions like trauma, thrombus or infection. Knowing that astroke affects the brain and the brain being the power house of the body means a lot. The brain contains two hemispheres the left and right and in must people the left is the dominant sphere. The left sphere powers the right side of the body and the right sphere powers the left side of the body(rigth handed people most times have left has dominant and vice versa). The brain can only suvive 5minute without oxygen suppy therefore any disease or tauma that can interrupt blood supply to the brain will cause damage to it which will ead to weakness or paralysis of the contralateral side depending on how severe the damage is. Most times the damage done on the dominant side affects the ipslateral side of the body.

The hearts electrical activity starts with the sino-atrial node in the right atrium, which sends its impulse to the rest of the heart causing contraction. However it the SA node fails there are still two backups, the AV Junction, and the purkinje fibers, however they are not able to send out impulses as fast and the contractions aren't as efficient.

They have four, two atrias and two ventricles.