Sinoatrial node

About the size of a large fist, heart is made up of cardiac muscle, myocardium, with skeletal muscle-like striations. It has two upper atria & two lower ventricles separated vertically by septum, and four main valves with which the blood makes its directional flow into and out of the heart. Deoxygentated blood with which the blood flows into and out of the organ. Deoxygenated blood enters through the venae cava fills the right atrium (RA) and right ventricle (RV) through the tricuspid valve.…

The heart contains many adrenergic receptors which are responsive to epinephrine, especially near the SA node, which initiates the contractions of the heart. Epinephrine acts to increase the release time of calcium from the sarcoplasmic reticulum via a cascade of reactions. The fact that epinephrine had a positive impact on the heart indicates that the heart…

of excitation is stopped by the non-conducting disc of tissue located at the bottom of the atria. It prevents the wave from causing the ventricles to contract too early. The only path to the ventricles is through another node known as the Atrioventricular Node (AV) At the AV node, the electrical pulse is delayed allowing the atria to fully contract. After this the wave then travels down the inter-ventricular wall, through the Purkyne which is a special conducting tissue. It travels towards the…

Conclusion 1 : The degrees of exercise and the pulse rate are positively related. That means the pulse rate increases when the degrees of exercise increase. Explanation : - Pulse rate increases means the heart rate increases. - Heart rate increases means the frequency of the beating of heart increases. - Three reasons for the rise in pulse rate when the degrees of exercise increase. Reason ⅰ : To remove lactic acid in blood and skeletal muscle cells…

arrhythmia – left bundle branch block. An electrical current is triggers contractions of the myocardium. The body has its own built in pacemaker known as the sinoatrial (SA) node. The SA node controls the electrical current of the heart much like a pacemaker and in turn controls the rate in which the heart beats. The atrioventricular (AV) node later receives the electrical current and sends the current to the ventricles thru cells known as the AV bundle. This is the area that this victim had a…

electrical amplitudes in the heart muscle, and a natural reflex in the body known as the baroreflex (Lehrer & Gevirtz, 2014, p. 1). They go on to find that the rate at which a participant breathes has a direct correlation with the sinoatrial (SA) node of the heart. The SA node can be thought of as the electrical pacemaker of the heart and is positively affected at around 5.5 breaths per minute, or about an 11 second inhalation and exhalation sequence (Lehrer & Gevirtz, 2014, pp.…

cardiac depolarization caused by electrical currents that induce muscle contraction. The electrical component of the heartbeat begins in the Sinoatrial (SA) Node and its function is to send electrical impulses that stimulate your heart to beat, and these impulses induce the atria to contract. As the atria contract, the impulse moves on to the Atrioventricular (AV) node which leads the ventricles to contract (A). A pacemaker becomes necessary when the heart suffers from arrhythmia, a condition of…

During the Body Works experiments the patient performed a number of tasks. The patient performed a task called the Eat Healthy (My Pyramid/Diabetes) where she picked out a number of meals that represented the types of meals that she would eat on any given day. She selected foods like spaghetti and meatballs, a turkey sandwich, hamburger and fries, and a chocolate ice cream bar. After the patient was finished picking through the menu the machine then gave her a total for the amount of calories…

Exercise effects the human body in many fascinating ways; as it causes the body to adapt and alter to aid the body’s stimulation. Take when carrying out the Harvard step test practical. This test is where a person carries out a period of exercise for a certain length of time and then records their heart rate before and for so long after the period. This shows how fit and healthy the heart is by showing how long it takes for the heart to go back to a regular resting pulse rate. “The…

Question 1. A. AIRWAY– Maintaining a clear airway is always considered a high priority because the airway is essential for gas exchange. However, the patient has a patent airway (Ramkumar, 2011). The nursing strategy is to conduct an airway assessment “look, listen and feel” continuously to detect any changes. This is to provide immediate respiratory care if the patient’s airway is compromised (Higginson, Jones & Davies, 2011). This is a low priority. B. BREATHING – Respiration is altered due…