When exercising the cardiovascular system has different functions during exercise , such as it delivers oxygen to working muscles, oxygenates blood by returning it to the lungs, transports heat from the core to the skin, it delivers nutrients and fuel to active tissues and I also transports hormones . Exercising is known as an increased demand on the cardiovascular system. Oxygen demand by the muscles increases sharply. Metabolic processes speeds up and more waste is created. More nutrients are used and body temperature rises.
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.
Sustained contractions from postural muscles take place always when a person is awake. An example of a sustained contraction is, when the neck muscles contract to hold the head straight up. Storage of food in the stomach, and storage of urine in the bladder is feasible because smooth muscles close of the exit routes. As
Blood Pressure Blood pressure is the force created by the heart as it pushes blood into the arteries and the circulatory system. When the heart pumps, it causes blood to flow through the arteries and into the arterioles. As the blood goes through the arterioles, the arterioles either contract or expand altering both the amount of blood flow and the resistance to blood flow. If the arterioles remain in a contracted form, they create high blood pressure. The heart must then pump harder because the arterioles are exerting a greater resistance to blood flow.
What is a tendon made of? Tendons are made of dense, regular connective tissue. This form of connective tissue consists of densely packed bundles of collagen fibres. These fibres all run parallel to each other in the direction of the pull that is generated on the tendon What are agonistic muscles? Agonistic muscles are a classification used to describe a muscle that causes specific movement or possibly several movements to occur through the process of its own contraction.
It then helps to pump blood around the body, to supply tissues with oxygen and nutrients and to transport waste products away from the tissues. The blood vessels of three different types which are the capillaries, veins and arteries. The Arteries: * Carry blood away from the heart (always oxygenated apart from the pulmonary artery which goes to the lungs) * Have thick muscular walls * Have small passageways for blood (internal lumen) * Contain blood under high pressure The Veins: * Carry blood to the heart (always de-oxygenated apart from the pulmonary vein which goes from the lungs to the heart) * Have thin walls * Have larger internal lumen * Contain blood under low pressure * Have
The Structure and Function of the Heart The heart is a muscular organ that works continuously throughout the lifetime or an organism; it lies in the thoracic cavity behind the sternum. The human heart is two pumps side by side, separated by the septum, the left side of the heart deals with the oxygenated blood which comes from the lungs, and the right side deals with the deoxygenated blood which comes from the body. Each pump has two separate chambers; the atrium has thin walls and elastic, which stretches as it collects the blood. The ventricle has a thicker muscular wall, as it has to pump the blood a longer distance, to the lungs or the rest of the body whereas the atrium only has to pump it to the ventricle. The right ventricle only has to pump blood to the lungs, which are only a short distance away compared to the left ventricle, which has to pump blood to the extremities of the body.
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.
Tissues and Tattoos The four types of tissue are epithelia, connective tissue, muscle tissue and neural tissue. They are all different but all serve a general purpose to cover, fill and protect what is underneath. Epithelia cover exposed surfaces, line internal passageways, chambers and produce glandular secretions. Connective tissues are responsible for filling internal spaces, provide structural support and store energy. Muscle tissue contract to produce active movement.
CEREBROVASCULAR DISORDERS The term cerebrovascular disorder can be taken to mean ‘any disruption of brain functioning arising from some pathological condition related to the blood vessels, which produces an array of disorders of great complexity’ (Walsh, 1987). Since all cerebrovascular disorders originate due to impairment in the blood supply within the brain, it is important for one to understand the setup and functions of the arteries that are involved in this process. 1. ARTERIES AND BLOOD FLOW OF THE BRAIN: Since the central nervous system is one of the most active tissues in the body, it requires a rich supply of oxygen and glucose. One realizes the importance of understanding the circulation system when you consider the fact that impairment to blood supplies is the leading cause of lesions in the central nervous system.