Description Key Terms Of The Movement Of Blood Through The Body Via Veins And Arteries

Early doctors were researching arrhythmia in heart beat as a result of unknown abnormal neuro-cardio mechanisms of the heart, one of theories was that SA and AV nodes were interfering with each other’s bio-electrical impulses another theory was that the right side of the septum was hypersensitive to electrical impulse, all were more else on the right track because we know now that SVT is a result of a faulty electrical connections of the heart.

A 30cm piece of thread was placed around the heart at the Atrioventricular groove (AV groove) and tied in a knot but left loose so as to not interrupt the normal function of the heart. The heart was allowed to beat for about 15 seconds with no pressure. After 15 seconds the knot was slowly tightened while taking care to stay on the AV groove while tightening. Data was observed and recorded.

• Pulse Oximetry - Tests the percentage of oxygen in the blood. 95% or more is a normal level,

Baroreceptors located in the aortic arch and carotid sinuses detect changes in blood pressure. When a drop in blood pressure is detected,

| |Coronary circulation |that pushes blood to the organs, |Abnormal heart rhythms or arrhythmias |

The effects of a ligature around the AV groove presented no difference in the contraction of atria or ventricle after the first tightening. After the string was tightened further, the ventricular contractions were lost and the atria beat alone at 60 BPM. The AV signal between the chambers was blocked.

The blood circulates around the body. The heart contract and relax, this mechanism of heart makes the blood to flow in the arteries to the body from heart and come back from body to heart through veins. The arteries carry oxygenated blood or oxygen rich blood and the veins carry deoxygenated blood or oxygen poor blood. This flow creates the pressure on the arterial wall and the pressure that is exerted on the arterial wall is known as blood pressure. Blood pressure is expressed by the

R E V I E W S H E E T 30 Anatomy of the Heart

The patient has been diagnosed with atrial defibrillation and congestive heart failure. There is no visible jugular vein distention or pulsations on either side of the neck. The patient was not comfortable with removing her sweater, therefore, pulsations, lifts, or heaves were not seen if present. Palpated and auscultated the carotid arteries for vascular sounds, no bruits heard. Heart sounds were auscultated with the bell and diaphragm of the stethoscope. S1 82/min, even and regular. S2 85/min, even and regular. S3 82/min, even and regular. S4 83/even and regular. No murmurs were heard. The apical pulse rate was 92 bmp, regular and was accessed with patient in sitting position and between the 4th and 5th intercostal space. Patient stated

According to research, more than 1 in 3 individuals of the American population have some form of cardiovascular disease. Hypertension is at the forefront for being the most widespread circulatory problem in adults. This condition is distinguished by a person having consistent elevated blood pressure. Although the ranges for healthy blood pressure is different for everyone, medicine tells us that the ideal pressure should remain near 120/80 mmHg. These numbers are a representation of the force being exerted into our arterial system. The first number (Systolic) displays the amount of force upon the arterial walls while the heart beats. Whereas, the second reading (Diastolic) is a measurement of pressure while the heart is relaxed. One notably

The wave spreads through the atria before reaching the atrioventricular node, or AV node, located just above the right ventricle. The AV node focuses the wave into the ventricles, contracting the ventricles. Should the SA node fail, the AV node can take over as the primary pacemaker at a rate of forty to sixty beats per minute.

The S-A node signal is delayed by the atrioventricular node to allow the full contraction of the atria that allows the ventricles to reach their maximum volume. A sweeping right to left wave of ventricular contraction then pumps blood into the pulmonary and systemic circulatory systems. The semilunar valves that separate the right ventricle from the pulmonary artery and the left ventricle from the aorta open shortly after the ventricles begin to contract. The opening of the semilunar valves ends a brief period of isometric (constant volume) ventricular contraction and initiates a period of rapid ventricular ejection.

Regular electrical impulses are sent within the conduction system of the heart prompting contraction (Marieb, 2015). These electrical signals can be identified and documented by the use of an electrocardiography (ECG) machine. In a familiar ECG recording, three waves will occur; The P wave, QRS complex and

• sinoatrial node- is the impulse-generating (pacemaker) tissue located in the right atrium of the heart, and thus the generator of normal sinus rhythm.

amount of pressure exerted on arterial walls in the patient’s heart. Blood pressure is measured in