";s:4:"text";s:4329:" Continued Looking at the outside of the heart, you can see that the heart is made of muscle.
Coronary Arteries. Myocardium, the thick middle layer of muscle that allows your heart chambers to contract and relax to pump blood to your body. Left umbilical vein carries highly oxygenated blood (80%). Learn vocabulary, terms, and more with flashcards, games, and other study tools. The heart is made of muscle. Has sphincter mechanism: Closes and prevents overloading of heart during uterine contraction. The heart is made of three layers of tissue. The heart is located under the rib cage, to the left of your breastbone (sternum) and between your lungs. It’s a muscle, about the size of your fist, in the middle of your chest tilted slightly to the left. Arteries carry blood away from the heart. Coronary circulation consists of coronary arteries and coronary veins. Bypasses portal circulation . What does open heart surgery involve? The center of the circulatory system is the heart, which is the main pumping mechanism.
Learn vocabulary, terms, and more with flashcards, games, and other study tools. Made of thin layers of tissue, it holds the heart in place and protects it. This helps improve circulation as it puts the hips and heart above the head, allowing gravity to increase blood flow towards the head. They provide the arterial supply of the coronary circulation. Your heart is divided into four chambers. Endocardium, the thin inner lining of the heart chambers that also forms the surface of the valves. The circulatory consists of the heart and all the bood vessels in the body (arteries, veins and capillaries). It is hollow so that it can fill up with blood. The oxygen-deficient blood is discharged from the body into the right atrium through two large veins, known as the superior and the inferior vena cava. Your heart has its own electrical system that coordinates the work of the heart chambers (heart rhythm) and also controls the frequency of beats (heart rate). Your heart is a pump.