Veins

Yes, it's true. The beating of the heart only drives blood in the arteries. As the blood passes from the arteries to the capillaries and then to the veins, it ceases to be pumped by the heart, so no pulse can be felt. Blood in the veins returns to the heart because of the valves in the veins, and because of general muscular contractions in the body, rather than because of the heart.

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.

doctors typically draw blood from veins because veins are more superficial (ie close to the surface of the skin) and therefore more easily accessible. additionally, arteries are under high pressure and there is a risk of major bleeding. lastly, you have less collateral circulation with arteries than veins. what that means is this (let's use your arm as an example): there are many different veins in your forearm that lets blood get from your hand back to your heart, so damaging any one of these veins isn't a big deal. however, there are only two arteries in your forearm that supplies blood to your hand (the radial and ulnar arteries). Arterial blood is sampled from the radial artery because it's bigger and more easily accessible. However, damaging this artery can be catastrophic if the ulnar artery is not well developed, because then your hand is not getting enough blood, and it can become gangrenous and die (this is a vascular emergency). That is why doctors will do an Allen's test (look it up on google... you can even try it on yourself) before doing an arterial stick to make sure you have good blood flow through your ulnar artery that can sustain your hand in case the radial artery is destroyed with the arterial stick. so for these reasons, doctors don't do an arterial blood draw unless they really need one, and the one test that comes to mind where you absolutely need arterial blood is the arterial blood gas test. this test is used when doctors need to know the oxygen saturation and pH of the arterial blood, typically in patients with respiratory failure and sometimes in type 1 diabetics with diabetic ketoacidosis (DKA).

bronchus and why is this in public health ans SAFETY

Blood donations or blood taken for tests at a laboratory are taken from a vein.

the blood cells help it from getting discinigrated.

The arteries and veins are the tubes that are connected to the heart. Arteries carry blood away from the heart, and veins carry blood to the heart.

These are known as arteries. Veins carry blood to the heart. The artery known as the aorta carries blood from the heart to the body (and splits progressively into the various other arteries like the carotid artery in the neck and the femoral artery in the legs), whereas the pulmonary artery carries blood from the heart to the lungs .

Pulmonary artery (to the lungs) Aorta (to the rest of the body.)

Arteries drain (pump blood) into veins. Veins drain into your lungs and heart to be re-oxygenated. (This is not true for veins and arteries to and from your lungs.)

Tubes that carry blood to the heart are veins. The two major veins that carry blood to the heart are the vena cava and the pulmonary vein.

The blood entering the Inferior Vena Cava comes from all your lower body areas... Legs, feet, ect.

There are arteries branching off your heart, one in your wrist, one near your trachea (in your neck), and one in your ankle.

Arteries carry blood away from the heart to the other parts of the body. Arteries also have thicker walls as the blood pressure is much higher having a closer proximity to the heart. Veins carry the blood back from the other areas of the body to the heart.

Simply put, an artery carries blood out of the heart, and a vein carries blood into the heart.

The tubes that carry blood are the blood vessels. They include capillaries, veins, and arteries.

The heart has four chambers - left atrium, left ventricle, right atrium & right ventricle.

The left chamber holds oxygenated blood while the right chamber holds deoxygenated blood. The two sides of the heart are separated by an interventricular septum between the ventricles, and an interatrial septum between the atria.

The Pulmonary circulatory system carries deoxygenated blood from the right side of the heart to the lungs for oxygenation and brings the oxygenated blood back into the left side of the heart.

The Systemic circulatory system carries oxygenated blood from the left side of the heart to the rest of the body where the oxygen is depleted, and then back into the right side of the heart.

Really, I know just a factor which is that the veins have a valve which helps to push the blood. This is because the vein has a thin muscular wall and low pressure. Therefore,the valve is there to prevent the flow back of blood.

The blood pressure and flow rate in veins is low. When the blood in them is moving upwards (e.g. in the legs) it can stagnate and may have a tendency to flow backwards in the vein. The valves prevent this back flow by closing.

The blood pressure and flow rate in arteries is high. Blood flow in the arteries cannot stagnate.

I think it's false but I can't be sure you might want to try someone else. I thought oxygenated blood went to teh lung by the arteries but hey better if you check with someone else uless your willing to risk it.

Blood vessels are the tubes that carry blood. The three types of blood vessels are arteries, capillaries, and veins.

The blood in veins is not under direct pressure from the heart. It has little valves inside to prevent blood from flowing backwards away from the heart. These valves inside the veins prevent the backflow of blood in veins. They encourage the one-directional flow of blood to the heart.

The descending aorta is divided into two portions, the thoracic and abdominal, in correspondence with the two great cavities of the trunk in which it is situated.

The descending thoracic aorta is located in posterior mediastinum.

Yes, and no. THE aorta is the bodies main artery that carries blood from the heart to the body. The aortic valve is a heart valve that, as you would expect, lies at the junction of the heart and the aorta. It prevents blood from flowing back into the heart once it has entered the aorta.