Jason has a heart murmur due to the ventricular septal defect and mitral stenosis, which were probably congenital. These conditions could reduce the amount of blood pumped by the left ventricle through the systemic arteries, and thus weaken his pulse. The reduced blood flow and consequent reduced oxygen delivery to the tissues could be the cause of his chronic fatigue. The lowered volume of blood pumped by the left ventricle could cause a reflex increase in the heart rate, as detected by his rapid pulse and the ECG tracing showing sinus tachycardia. Jason's high blood cholesterol and LDL/HDL ratio is probably unrelated to his symptoms. This condition could be dangerous, however, as it increases his risk for atherosclerosis. Jason should therefore be placed on a special diet, and perhaps medication, to lower his blood cholesterol.

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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