Systole

Introduction: The heart rate of an animal can be used as an indicator to identify when a stimulus evokes a reaction from the animal. Specifically in the case of humans’, there tends to be the cognitive ability to physically withhold a reaction from a stimulus and mask the involuntary reaction. However, the heart rate reacts immediately after a stimulus, and is not reigned in or controlled cognitively, so could the heart potentially be a true indicator of an individuals reaction to a stimulus? The experiment that Life 103 L23 designed, recorded the heart rates response to an unknown fear stimulus and analyzed how strongly the heart reacted to the stimulus compared to a basal reading; as well as analyzing how much time elapsed after the stimulus for the heart to return to the region of the basal reading. The experiment also tested the physiologic response to the same fear stimulus for a group of individuals who knew the fright was impending, and analyzed the same data in comparison to the individuals who did not know when the fear stimulus would occur. The hypothesis for the experiment was that an unknown fear stimulus would cause an increase in heart rate, diastolic, and systolic blood pressure, while a known fear stimulus would not affect or generate a physiologic response. The null hypothesis for the experiment was that the fear stimulus would not cause an increase in heart rate, diastolic, and systolic blood pressure; therefore the fear stimulus would not evoke any…

Systolic Function and Dysfunction Jeffrey Irwin Argosy University Twin Cities ECH215-Cardiovascular Principles II Zach Traverse 7-24-2015 Systolic Function and Dysfunction In this paper I will discuss systolic function and systolic dysfunction. I will first define systolic function from physical as well as from physiological aspects: from mechanical and electrical systole, to preload and afterload. From there I will describe four modalities in which systolic function is measured…

exerted on the blood vessels when the ventricle is contract (systole). The pressure is due to the force produced as the blood is ejected contacted with the blood vessel’s wall. On the other hand, the diastolic or bottom pressure is defined as the amount of pressure of the blood vessels when the heart is at rest (diastole). DISCUSSION A) Pulse pressure In simplest words, the pulse pressure can be explained as the amount of pressure when the systolic pressure minus diastolic pressure. The unit…

rn what happens during the process of the Cardiac Cycle when the heart beats Post Cardiac Cycle poster and vocab on board Lesson (5 minutes) Ask students to place their right hand over their heart and to make a mental note of what they feel 1 minute Ask students have they ever wondered why they heart beats slower or more quickly during certain events? 'Lub-dub,' 'lub-dub' - This is the familiar sound of the heartbeat. You can think about the things that make your heart race, like watching a…

body is referred to as the cardiac cycle. To start the cardiac cycle, the sino atrial node sends out electrical impulses, in the form of the movement of potassium (K⁺), sodium (Na+) and calcium (Ca2+) ions (McMaster Pathophysiology Review, 2005). The impulse first travels through the bundle of His, located in the middle of the heart between the two sets of artia and ventricles. The bundle of His then divides into two main branches of fibres, one suppling the impulses to the left side of the…

pulmonary, are connected and have abnormal blood flow and usually happens following birth. Before birth, the aorta and pulmonary arteries are connected by the ductus arteriosus for fetal blood circulation. However, immediately after birth up to a few days, the duct closes on its own as part of the normal development process. However, the duct doesn’t always close, which leads to the patent ductus arteriosus condition. It puts a strain on the heart and increases blood pressure in the pulmonary…

This occurs when the ventricles are almost full the atria contracts, pumping more blood into the ventricles. The contraction completes ventricular filling, causing the pressure and volume in the ventricles to further increase. Following Atrial Systole is Ventricular Systole. This is when the ventricles contract, forcing blood back up towards the atria. When the pressure in the ventricles exceeds that in the atria it snaps the AV valves shut, causing the first heart sound, “lub.” The…

The second noise we hear, ‘the dub’ is the sound of the closing of the aortic and pulmonary vales, occurring during ventricular systole. Abnormal- Heart murmurs are extraneous heart sounds due to the turbulent flow of blood going backwards through the valves when they do not close tightly (regurgitation) or forwards through the valves that do not open completely (stenosis). The Role of autonomic NS on heart rate The heart is controlled by two branches of the autonomic nervous system. • The…

Physiology Murmurs are the product of intense blood flow across inflexible, calcified valves; faulty valves that permit reverse blood flow (regurgitation); faulty (deviant openings) in the septum, aorta, or pulmonary artery; or abnormally high velocity of blood flow through a normal structure. Supposedly blood generally flows soundlessly through the heart; yet, these conditions can generate tumultuous blood flow resulting in auscultation of swooshing or gusty sound over the precordium (Weber &…

The second stage is the atrial systole, during this stage the atrium contracts which allows blood flow from the atrium to the ventricle. The third stage is known as the isovolumic contraction, which is the stage where ventricles begin contracting, the aortic and semilunar valves close which prevents a change in volume. The fourth stage, ventricular ejection, is the moment where the ventricles are emptying themselves through contractions. The final stage is called the isovolumic relaxation time,…