From the lungs, blood drains into the left atrium and is then pumped into the left ventricle. The left ventricle then pumps this oxygen-rich blood out into the aorta which then distributes it to the rest of the body through other arteries. The heart is a hollow, muscular organ; its job is to pump blood through a network of blood vessels. The vessels form a circle, which starts at the heart, goes out through the body, then ends back at the heart again. The heart has two sides, the right and the left side.
Cardiac Cycle * The heart is a muscle that pumps blood throughout the body. Of course, the process is not quite that simple. The heart has four chambers, two on the right (right atrium and right ventricle) and two on the left (left atrium and left ventricle). The right side is responsible for accepting blood from the body and getting it to the lungs. The lungs add oxygen to the blood and remove carbon dioxide.
The blood vessels are a intricate network of tubes that transport blood throughout the body. These vessels carry blood from the heart via the arteries ,then arterioles, then to capillaries or sinusoids, to venules, to veins and back to the heart. The final component to this structure is blood that delivers nutrients and removes wastes that are a by product of cellular processes that happen within the body. What is its
Then the semilunar valves in the arteries close as the arterial blood pushes against them. The cardiac cycle explained *A wave of electrical activity spreads out from the SAN across both atria this causes them to contract. *Prevention of the waves crossing to the ventricles is due to the layer of non-conductive (atrioventricular septum). *The wave of electrical activity is allowed to pass through a second group of cells called the AVN, which lies between the atria. *After a short delay the AVN conveys a wave of electrical activity between the ventricles along a series of specialised muscle fibres called the bundle of his.
‘Describe the cardiac cycle and relate the structure and operation of the mammalian circulatory system to its function’ The cardiac cycle is an repeating sequence of contraction and relaxation of the atria and ventricles. The cardiac cycle allows for blood to be continuously transported around the body via the circulatory system. The features of the heart and the circulatory system are adapted in order for their functions to be carried out correctly. The first stage of the cardiac cycle is atrial systole/ventricular diastole. The atria contract, which decreases the volume of the atrium and increases the pressure within it.
One of the physiological process consist of cardiac system which performs the important task of rhythmic pumping of blood throughout the body to facilitate the delivery of nutrients, it also performs the pumping of blood through the pulmonary system for oxygenation of the blood. Most physiological processes are manifest themselves as signals that reflect their nature and activities.
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.
Lab Report: Coronary transport of the heart Introduction: The heart is an organ of the cardiovascular system. Using blood as the transport vehicle, this system functions to transport substances around the body that are vital to homeostasis. In this lab, the experiment will be to locate and identify the various structure of the heart and also to trace the coronary circulation. Also with prepared slides, the objective will be to compare and contrast the different structures of cardiac muscle to that of smooth muscle. Materials: Heart model, Marieb and Mitchell laboratory manual, microscopic slides, camera, and microscope Procedure: Each lab group observed the external and internal surfaces of the heart, locating and identifying the three layers and the heart wall, the four chambers of the heart and the structures associated with them, locating and identifying the fossa ovalis, pectinate muscles, papillary muscles and chordae tendinae.
In cardiac muscle intercalated discs is a specializes junction between cells. These discs allow for the free flow of action potentials between cells that create muscle contractions. B. What are intercalated discs and what do they do? The cardiac muscle have to be both elastic and strong because the heart has to have both elasticity and strength, and being opposing force allows the heart to do both function properly.
Ventricle pumps blood into PULMONARY trunk (almost immediately branches into the pulmonary arteries), which carries deoxygenated blood to the lungs away from the heart. 5) Blood becomes OXYGENATED in the lungs, and then travels to LEFT ATRIUM in PULMONARY VEIN (carries oxygenated blood towards heart). 6) From the LEFT ATRIUM, blood passes through bicuspid valve into the LEFT VENTRICLE 7) REPEAT!! * As blood flows away from the heart, it transported to the body’s organs and tissues in relatively large vessels. * HEART ARTERIES ARTERIOLES CAPILLARIES VENULES VEINS 3.