The myocardium is the middle layer and is the muscle tissue and majority of the heart. The myocardium is what causes the heart to contract. The heart consists of four heart chambers which receive the blood that circulates through our body. The two main chambers are the right atria and the left atria and the two other chambers are called the right ventricle and the left ventricle. The atria deliver blood the ventricles.
The lungs add oxygen to the blood and remove carbon dioxide. Then the left side is responsible for accepting blood from the lungs and pumping it back out into the body. Think of it like a cycle where blood flows like this: From the body into the top right chamber (right atrium) -- down into the bottom right chamber (right ventricle) -- out to the lungs -- back to the top left chamber (left atrium) -- down to the bottom left chamber (left ventricle) -- then out to the body. The heart is innervated by the autonomic nervous system, but it also has its own system to generate electrical impulses that stimulate cardiac muscle to contract. These electrical impulses can be recorded in an ECG (electrocardiogram) and used to detect problems with the heart.
ANATOMY AND PHYSIOLOGY SECTION A Explain the function of the heart, and the structure of arteries, veins and Capillaries As per the Cardiologist, Dr. Laurence Phillips, The human heart is an organ that pumps blood throughout the body via the circulatory system, it supplies oxygen and nutrients to the various parts of the body and removes waste and carbon dioxide. The tissues and organs of the body need a constant supply of nutrients in order to be active and healthy. If the heart is not able to supply blood to the organs and tissues they will die. There are 3 main kinds of blood vessels – arteries, veins and capillaries. • Arteries carry bright red oxygenated blood away from the heart at high pressure.
The blood then goes into the right ventricle where it contracts the blood into the pulmonary arteries. These arteries lead to the lungs where blood is then oxygenated. The oxygenated blood then flows from the lungs to the left atrium through the pulmonary veins. Due to pressure the mitral valve, which leads to the left ventricle, opens up and pushes the blood into the left ventricle. The left ventricle then contracts and forces the blood through the aorta, which provides the rest of the body with blood.
The cystic artery’s function is to supply passage of oxygenated blood to the gallbladder neck and the common bile duct. 16. What is the function of the portal vein? The portal vein carries blood that contains digested food from the small intestine to the liver. 17.
Like other body parts, the heart needs oxygen in order to grow and develop properly. It’s responsible for circulating blood, oxygen and nutrients around the body. The wall of the heart is made up of three layers: The Endocardium – is the inner layer of the heart wall. The Myocardium – is the middle layer of the heart and it’s made up of the cardiac muscle. The Pericardium – is the outer layer of the heart.
It is divided vertically into two halves by a septum, and each side of the heart has two internal chambers – an atrium on top and a ventricle on the bottom. Venous blood enters the right side of the heart through the right atrium and is pumped by the right ventricle to the lungs, where carbon dioxide is released and oxygen acquired. Oxygenated blood from the lungs is transported to the left atrium and is pumped by the left ventricle into arteries that carry it throughout the body. Four heart valves regulate the direction and flow of blood through the chambers of the heart. It is their opening and shutting that gives the heart its characteristic "lub-dub" beat.
prevent eversion of valves. synchronize the contraction of the myocardium by synchronizing action potentials. | 3. (TCO 1) Which of the following lists the elements of the heart's conduction system in the correct order? (Points : 2) | SA node, AV bundle, bundle branches, AV node, conduction myofibers AV node, SA node, AV bundle, bundle branches, conduction myofibers SA node, AV node, AV bundle, bundle branches, conduction myofibers conduction myofibers, AV bundle, bundle branches, AV node, SA node | 4.
Repolarization is the recharging of the heart after each heartbeat (VanPutte, 2011). There are five main components of an electrocardiogram: P, Q, R, S and T. The p waves, corresponds to depolarization of the atria (VanPutte, 2011). The QRS complex represents the progressive wave of ventricular depolarization (VanPutte, 2011). The T wave represents the repolarization of the ventricles. In this lab experiment four leads were used: one each on the left and right wrist and one each placed above the ankle of the left and right foot.
Before telling you about hypertension, I would like to take the opportunity to talk with you about what blood pressure is, and do my best to answer any questions you may have. The force put forth by the blood against the walls of blood vessels is blood pressure. It depends on the thickness and amount of the blood, the flexibility of the artery walls, strength of the heartbeat, and the healthiness of the individual. There are two different numbers that represent blood pressure: top and bottom. The top number measures the contraction of the heart during which blood is pumped into the arteries.