The Pericardium – is the outer layer of the heart. The heart consist four types of chambers, which are: The right atrium The left atrium The left ventricle The right ventricle The right and left atrium are the upper chamber of the heart (atria) and the left and right ventricle are the lower chambers of the heart (ventricles). A muscular wall called the septum separates the right and left sides of the heart. Each chamber con-sist a valve. A valve prevents the backflow of blood.
Describe the four valves of the heart, including their name, location, and function. The four valves of the heart are the tricuspid valve, the pulmonic valve, the mitral valve, and the aortic valve. The tricuspid valve: It is located between the right atria and the right ventricle. It is comprised of three “flap-like cusps” which when in its closed position, prevents the deoxygenated blood entering the heart from the body, from backing up in the right atrium from the right ventricle (regurgitation). http://www.healthline.com/human-body-maps/tricuspid-valve The Pulmonic Valve: This valve is found between the right ventricle and the lungs.
The wave passes to the atrioventricular node where it is passed down the septum down specialised fibres known as the bundle of His. This occurs after a short delay to allow all the blood to flow from the atria to the ventricles. This wave passes down the bundle of His to the Apex of the heart where the Ventricles contract upward, pumping blood out of the ventricles into the pulmonary artery and aorta through the semilunar valves. Here the blood is then passed round the body where it
They tend to enlarge following vigorous exercise, a phenomenon called muscular hypertrophy and are located around the body. Conversely, cardiac muscle is confined only to the heart, its main role being to distribute blood. Its myogenic nature means contractions are under involuntary control and cause prevention from fatigue. The natural beating rhythm is adjusted via sympathetic and parasympathetic neurons of the CNS to suit physiological conditions. The function of these muscles is closely related to their structure and any differences in structure allow these two types of muscle to be identified.
The smallest arteries, called arterioles, direct the blood flow into the capillaries. The capillaries connect to the smallest veins called venules. The Veins then return blood to the heart. The arteries are elastic, muscular tubes that carry the blood from the left ventricle of the heart to the capillaries. The walls of the arteries are thicker than the other vessels because of the high pressure.
Chapter 18 Practice Quiz 2 1. Heart valves function to A. pump the blood B. prevent clots from entering the heart C. direct the blood flow through the heart D. measure the blood pressure 2. The right and left atrioventricluar valves open when the A. atria contract B. papillary muscles contract C. atria relax D. ventricles contract 3. During atrial systole, the upper chambers contract and open the AV valves so that blood can be pumped into the A. ventricles B. veins C. atria D. arteries 4. Blood flows past the aortic semilunar valve when the contracts.
This would be in places like the stomach, intestines, blood vessels and the bladder. Smooth muscles are arranged in layers with the fibers in each layer running in a different direction. This makes the muscle contract in all directions. Cardiac muscle- tissue forms the bulk of the wall of the heart. 5.
Blood passes from the right ventricle through the pulmonary valve(pulmonary semilunar valve) into a large artery called the pulmonary trunk, which divides into right and left pulmonary arteries and carries blood to the lungs. Arteries always take blood away from the heart (a mnemonic to help you: artery =