West Coast EMT BLOCK EXAM #2 Correct 100%

What is the electrical conduction system of the heart? - ANSWER - A network of specialized tissue that is capable of conducting electrical current runs throughout the heart. - The flow of electrical current causes smooth, coordinated heart contractions. - The contractions produce the pumping action of the heart. - Each mechanical contraction is associated with two electrical processes: 1. Depolarization: electrical charges on the surface of the muscle cell change from positive to negative 2. Repolarization: the heart returns to its resting state, and the positive charge is restored to the surface - Electrical impulses begin high in the atria at the sinoatrial node, travel to the atrioventricular node and bundle of His, and then move through the Purkinje fibers to the ventricles. What are the layers of the blood vessels? - ANSWER Adventitia (outer layer), tunica media (middle layer), tunica (intima) inner layer What is the function of the adventitia (outlet layer)? - ANSWER - provides structural support and shape to the vessel What is the function of the tunica media (middle layer)? - ANSWER - composed of elastic and muscular tissue which regulates the internal diameter of the vessel What is the function of the tunica intima (inner layer)? - ANSWER - consists of an endothelial lining which provides a frictionless pathway for the movement of blood Name all 6 pulses - ANSWER - Carotid artery pulse - Femoral artery pulse - Radial artery pulse - Brachial artery pulse - Posterior tibial artery pulse - Dorsalis pedis pulse Where is the Carotid artery pulse located? - ANSWER - At the upper portion of the neck Where is the femoral artery pulse located? - ANSWER - In the groin