One of the most important systems in the body, keeping it alive, is the cardiovascular system. As a part of the circulatory system, the cardiovascular system pumps blood throughout the body through a network of many arteries and veins, providing it with nutrients and oxygen. Also, the cardiovascular fights infections and disease in the body and creates blood cells. Never the less, blood acts as a filtration system for the body and removes waste, cell debris, or bacteria from the bloodstream.
* The heart is enclosed by a sac known as the pericardium. There are three layers of tissues that form the heart wall. The outer layer of the heart wall is the epicardium, the middle layer is the myocardium, and the inner layer is the endocardium. The internal
Oxygen and nutrients the body requires for function are pumped around this complex network of blood vessels by the heart. At roughly the size of a human fist, the heart is a four-chambered muscle and performs two functions of circulation simultaneously and continuously. Systemic and pulmonary circulation. The heart is made up from three separate layers of cardiac tissue; the outer layer called the pericardium, which is a double sac-like outer covering with serous fluid inside to keep the middle layer, the myocardium from adhering to the outer layer. This middle layer of the heart is the heart muscle which is thicker on the left side, to aid with the pressure needed to sustain systemic circulation. The inner layer of the heart is the endocardium. It’s lining is smooth to help prevent the blood which circulates around the inside of the heart from clotting. The heart is the human body’s in-built pacemaker, and the electrical signals sent through the it cause the heart to contract and relax. This process is triggered by the autonomic nervous system and the contraction and relaxing cycle is
The cells of the connective tissue pictured below in a cross section from the trachea are specialized for fat storage and do not form ground substance or fibers. On prepared slides, this type tissue appears somewhat like a fish net with white spaces connected together in a network. The cytoplasm and nucleus have been pushed to one side by a single, large, fat-filled vacuole that occupies the center of the cell.
The atrium chambers are small and collect blood returning to the heart from the systemic or pulmonary circulation. The ventricles are larger than the atrium chambers and they pump blood out into the circulation. The right atrium and right ventricle are separated by the tricuspid valve. The tricuspid valve has three flaps that prevent backflow of the blood from the right ventricle into the right atrium. The left side of the heart has a mitral valve also known as the bicuspid valve that consists of two flaps that separates the left atrium and left ventricle. The heart has a thick wall that is mainly of muscle and is constantly contracting and relaxing through every heartbeat. The hearts wall has three layers of tissue which consist of the innermost layer called the endocardium which is a smooth, thin membrane that lines the inside of the champers of the heart and forms the surface of the valves. The second layer is the middle layer that is called the myocardium. It is the muscular wall of the heart and is made of many layers of cardiac muscle which is striated and involuntary muscle tissue. Then the outer layer of the heart is the epicardium that is a double layered fibrous sac that covers and protects the heart.
The epithelial tissue acts as a barrier between the body and the rest of the world.
Blood vessels are hollow (this hollow space is called the lumen) so as to allow the blood to pass through. They are also lined with endothelium, which prevents the clotting of the blood that passes through.
The heart is composed of four chambers, the right and left atrium and the right and left ventricles. This important muscle is used to pump and create pressure to circulate blood throughout our bodies2. It is important for our heart to properly function because it helps blood deliver important nutrients and oxygen to the rest of our body. The heart is located in between the lungs (2/3 slightly tilted to the left), in the central portion of the thorax2. The atria collect the blood versus the ventricles which pump out the blood to the rest of the body. In order for the heart to properly function is must also receive enough oxygen and proper electrical stimulus. The coronary arteries are in charge of distributing adequate amounts of oxygen to the heart2. The heart’s nodes help the heart function with electrical impulses which allow the heart to contract. These are also known as the pacemakers of the heart. Failure to properly function can result in a heart attack.
physical activity produces changes in body organs such as making your heart muscle stronger and your blood vessels healthier. Regular physical activity benefits who vital body systems, your cardiovascular system is made up of your heart, blood vessels, and your blood. Your respiratory system is made up of your lungs and the air passages that bring air, including oxygen, from outside of the body into the lungs. In your lungs, oxygen enters blood while carbon dioxide is eliminated. The cardiovascular and respiratory systems to work together to bring your body cells the materials they need to function and to get rid the cells of waste. Exercise helps these systems function more effectively because your heart is a muscle, it benefits from exercise
The heart is made out of three layers of tissue. The outer layer is epicardium, it is a thin membrane which helps to protect outside of the heart. The middle layer is called myocardium which contains the cardiac muscle tissue. Myocardium is the thickness a heart wall and the pump of blood is responsible for the myocardium. Lastly, the inner layer is called endocardium is thin and smooth. It job is to keep the blood sticking inside of the heart.