THE CIRCULATORY SYSTEM
By: TODD MOON
The circulatory system transports blood around the body. the circulatory system consists of three parts the heart,veins,arteries,and capillaries. The circulatory system is often seen to be composed of both the cardiovascular system, which distributes blood, and the lymphatic system, which circulates lymph.These are two separate systems.
- The heart consists of thirteen parts. The right atrium, the left atrium, the right ventricle, the inferior vena cava, the left ventricle, the tricuspid valve, the pulmonary valve, the pulmonary artery, the aorta, the aorta valve, the supierour vena cava, the mitral valve, the pulminary vein. the heart is the most important part of the body. without it your toast
.Blood is a bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. When it reaches the lungs, gas exchange occurs when carbon dioxide is diffused out of the blood into the alveoli and oxygen is diffused into the blood. THis oxygenated blood is pumped to the left hand side of the heart in the pulmonary vein and enters the left atrium. From here it passes through the bicuspid valve, through the ventricle and taken all around the body by the aorta. Blood contains antibodies, nutrients, oxygen and lots more to help the body work. there are three types of blood.
.In the circulatory system, veins are blood vessels that carry blood toward the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart. In contrast to veins, arteries carry blood away from the heart. Veins are less muscular than arteries and are often closer to the skin. There are valves in most veins to prevent backflow.
Capillaries are the smallest of a body's blood vessels and are parts of its microcirculation. Their endothelial linings are only one cell layer thick. These microvessels, measuring around 5 to 10 micrometre in diameter, connect arterioles and venules, and they help to enable the exchange of water, oxygen, carbon dioxide, and many other nutrients and waste chemical substances between blood and the tissues surrounding them. During embryological development, new capillaries are formed through vasculogenesis, the process of blood vessel formation that occurs through a production of endothelial cells followed by their forming into vascular tubes. The term angiogenesis denotes the formation of new capillaries from pre-existing blood vessels and already present endothelium which divides.
the circulatory system