Heart

Becase you don't exersise that much and you eat 2 much fat that's why

Christiaan Neethling Barnard (1922-2001) was the first person to transplant human heart successfully.

Because where the blood leaves the chambers are at the top. Try squeezing all the toothpaste out of a toothpaste tube by pushing down end with the hole. Not very effective. If you squeeze from the flattened end much more of the toothpaste will come out much more efficiently. (If you really must try this do it over a sink)

Certain diseases cause the heart muscle to get big or flabby. In either, the heart can't pump as effectively. This can result in hypertension, Congestive Heart Failure, Heart Attack, etc.

The human hear has four chambers, two Atria and tow Venticles, one left and one right of each. The Right Atrium pushes blood into the Right Ventircle which then pushed the blood around the pulmonary (lungs) circulation. Once the Blood return, oxygenated, from the lungs it enters the Left Atrium which pushes it ito the Left Ventricle which in turn pushes the blood all around the body, including right up to the top of the head. Just by looking at the distance each chamber has to push the blood is a good indicator of the size of the musclular wall of each. The vetricles are therefore much larger than the atria and the left is much larger than the right.

Oxygenated (O2) blood leaves the heart from the left ventricle entering the ascending aorta where the right and left coronary arteries branch off. The ascending aorta then becomes the Aortic Arch which has three branches: Brachiocephalic trunk, Left Common Carotid, and Left Subclavian. The Brachiocephalic trunk bifurcates into Right Common Carotid and Right Subclavian. The Right and Left Common Carotid bifurcate at C4 (Thyroid Cartilage level) forming the Internal Carotid and External Carotid. The Vertebral Arteries branch of the Right and Left Subclavian, running up the transverse foramina from C6 up to C1 where the Posterior Inferior Cerebellar Artery branches off, as well as the Anterior Spinal Artery. The Vertebral Artery merges to form the Basilar Artery where the Anterior Inferior Cerebellar Artery branches off, as well as the Pontine Arteries and the Superior Cerebellar Artery branches off inferior to the formation of the Right and Left Posterior Cerebral Artery (PCA). The PCA is the beginning of the Circle of Willis where the Posterior Communicating Arteries branch of the PCA connecting to the Internal Carotid Arteries with the Opthalmic Arteries branching off superiorly. The Internal Carotid Arteries become the Middle Cerebral Arteries (MCA) with the Anterior Choroidal Artery branching off inferiorly to the Anterior Cerebral Arteries (ACA) with the Anterior Communicating Artery connecting the two ACA together supplying the brain with O2 blood.

The Internal Jugular Vein drains the brain uniting with the Subclavian Vein to form the Brachiocephalic Vein. The Right and Left Brachiocephalic Vein Unite to form the Superior Vena Cava (SVC) dumping the blood into the Right Atrium of the heart.

I dont know but it would help me on my project if I did

The left ventricle of the heart pumps blood to all parts of the body.the oxygenated blood from lungs is collected in left atrium and pushed to the left ventricle which pumps the blood through aorta to all parts of body.this is also the reason that why the walld of left ventricle is more thick than right ventricle.

The many and various diseases of the heart valves generally lead to either or both stenosis and/or regurgitation. Stenosis is where an obstruction is caused, it can be by a number of things but when the valves are at fault is is usually because they either go stiff and block blood flow or they seel up again blocking blood flow. Regurgitation is when there is s defect in the valve that allows blood to flow back into the previous chamber. This can be in the form of eother a hole in one of the leaflets of the valve or an area where they do not meat correctly. In either situation the blood flow in the correct direction is limited and so the heart must work harder to compensate.

You may not know this but as well as pumping, your heart also sucks blood back into its' chambers like a vaccum which is how your blood gets returned to your heart.

A male 11 year old should have a heart rate of 80 to 95 BPM ( beats pear minute). I am an 11 year old that did this.

Medical professionals can do this by injecting a radioactive isotope into the bloodstream and follow it's progress using imaging equipment (MRI for eg).

I can't think of way to do this at home.

If you wanted to check the blood supply to your foot, press your toe with your finger, once you have moved your finger, the area should look white briefly then go back to a pinky colour similar to the rest of your foot fairly quickly.

A new born baby has sinus tachycardia which is a heart rate of more than 100 BPM The heart rate maybe between 120- 160 BPM

If you weren't to drink alcohol for the rest of yuor life you would extend your life by at least five years - depending on if you do drugs, exercise or how well you eat.

If you didn't drink at all you wouldn't live for more than a week if you're lucky.

circulatory system

When a guy makes your heart beat out of your chest and thinks your pretty means that you have a crush on them. When I was a child it was called puppy love. It is the point when you are obsessed and can't stop thinking about them.

Valves.

There are four in the heart and the rest of the valves are dispersed throughout the body. They function as muscles around the blood vessel contract to move the blood.

When the atria contract, there is increase in pressure in the atrial chambers. So both bicuspid and tricuspid valves opened up. When both the ventricles contract, both the bicuspid and tricuspid valves get closed. This opens up the aortic and pulmonary valves.

Autonomic nervous system, the sympathetic division that control fight or flight reactions also monitor HR and BR, neurotransmitters=GABA inhibitor , slows it down, Adrenalin effects boths, speeding them up

In rest position it may be high but in high activity, it is o.k.

Not sure how much detail ur looking for here... but basically this is what it is. The tricuspid valve is located between the right atrium (RA) and right ventricle (RV). When the ventricles (right and left) contract, they send blood forward into the arteries (RV to pulmonary artery to send blood to lungs for oxygenation, LV to the aorta to distribute oxygenated blood throughout the body). The purpose of valves is to prevent blood from backflowing. Since you asked about the tricuspid valve, it prevents blood going back up from the RV to the RA. Just in case you don't know the basic heart circulation... deoxygenated blood from the body comes into the RA from the superior and inferior vena cavae, and from the RA goes into the RV. Between these two is the tricuspid valve, and when the RA contracts, blood gets pushed into the RV. When the RV contracts to push blood into the pulmonary artery, the tricuspid valve snaps shut in order to prevent blood from getting pushed up into the RA again. Similarly, there are 3 other valves that function for the same reason (aortic, mitral, and pulmonic). Failure of the valves to close properly causes many heart problems!