The aorta is a large blood vessel that branches off from the heart and pumps oxygen-rich blood back into the body. The aorta carries blood away from the left ventricle and circulates it into the systemic circuit. The systemic circuit are the vessels between the aortic semilunar valve and the entrance to the right atrium.Know More
Oxygenated blood enters the body through capillary networks surrounding the alveoli of the lungs. Alveoli, air-filled pockets with barriers thin enough to allow oxygen to pass through, oxygenate the blood depleted of oxygen and absorb carbon dioxide for expulsion through the lungs. An exchange occurs at the alveoli, which transfers fresh oxygen from the lungs to the blood and carbon dioxide from the blood to the alveoli. The function of the aorta is to pump this new oxygen-rich blood from the left ventricle of the heart, where the oxygenated blood is deposited, and circulate it back into the body.
The shape of the aorta assists with blood circulation. It has four main sections: the ascending aorta, the aortic arch, the descending thoracic aorta and the abdominal aorta. The ascending aorta begins at the semilunar valve of the left ventricle and connects to the coronary arteries. The aortic arch curves like a cane and connects the ascending aorta and descending aorta. The descending aorta is a continuation of the aortic arch and is divided into the two sections: the thoracic aorta and the abdominal aorta.Learn more in Human Anatomy
The medulla oblongata is responsible for many of the autonomic functions of the body, including breathing, swallowing, heart rate and the proper working of blood vessels. The medulla also relays neural messages between the brain and the spinal cord. The medulla oblongata is a region of the brainstem.Full Answer >
Capillaries are extremely small blood vessels responsible for the delivery of essential nutrients directly to tissues throughout the body. They also help the body circulate blood and remove waste from its organs.Full Answer >
Peristalsis is a series of contractions that pushes solids or liquids through tubes in certain parts of the body, primarily the digestive system. Peristalsis is basically a wave of contractions, such as those used by the esophagus and small intestines to move food through the system.Full Answer >
Lymphocytes are a type of white blood cell that are responsible for initiating an immune response when a foreign invader enters the body. These cells are primarily in the tonsils, lymph nodes and the spleen, but they also circulate in the bloodFull Answer >