BPK 142 - Circulatory Questions With Complete Correct Solutions

What are the functions of the circulatory system? - ️️transport essential materials , collect waste materials The circulatory system is divided into? - ️️Pulmonary circuit - blood vessels going to and from the lungs Systemic circuit - blood vessels going to and from the rest of the tissues of the body. Much higher pressure than the pulmonary circuit Describe the anatomy of the heart - ️️Contain the Atria, Ventricles, Septum dividing left and right sides, thick walled left ventricle, composed of cardiac muscle, all fibers of the heart are interconnected (functional syncytium) , flow of blood is controlled by unidirectional valves. Heart murmur? - ️️Occurs when a valve is not closed properly > causing the blood to regurgitate. Explain how the heart muscle contracts - ️️-S-A node is the pacemaker of the heart. - S-A node > Atrial muscle fibers contract, > A-V node > A-V bundle > L/R branches > Purkinjie fibers travel throughout the ventricular myocardium > simultaneous contraction of the left and right ventricles. Electrocardiography? - ️️record the wave of depolarization as it passes across the heart using electrodes on the surface of the body. Why don't the atria and ventricles contract at the same time? - ️️The wave of depolarization is delayed at the A-V node by 0.1 seconds to allow the atria to get rid of its contents.