Can you help with number 1, 2, 3, 4, 8, Describe the types of controlling system
ID: 56623 • Letter: C
Question
Can you help with number 1, 2, 3, 4, 8, Describe the types of controlling systems of the heart. List and explain the role of each major structures involve ved in the intrinsic conduction system. Differentiate the SA node from the AV node. Autorhytbljvic cells exist throughout the heart. What does this means? Draw and label the waves, segments and intervals of a normal ECG/EKG. P wave Q wave R wave Save T wave PR interval QT interval QRS complex I. ST segment Be prepared to tell the events occurring at each wave, segment and intervals. What is indicated if the distance between two R waves are (1)below and (2) above normal? Define the following terms Tachycardia Bradycardia Fibrillation ischemia . Heart block Remember an ECG is a raco'd of vo'tase and time An ECG record electrical events how does the P-R intervals relate to partial and total heart block?Explanation / Answer
1. There are two types of controlling systems in the heart. a. Intrinsic control system and (b) extrinsic control system.
(A). Intrinsic control system: Hear responds to the varying amount of blood entering into the heart and changes its contractility according to the blood volume entering, this is known as the Frank-Starling law of the heart. How heart regulates this means, the more the cardiac muscle stretch, the more it contracts to pump it out giving more forceful cardiac output. The pressure is sensed by the arterial walls, of the pressure in arterial walls is more means (BP is high), the heart pumps more blood against the peripheral resistance, which intern forces more blood back to the heart causing more stretch. Thus, the blood in right atria determines the cardiac output. The intrinsic mechanism is controlled by SA (sino auricular node or pacemaker of heart) and AV (atrio-ventricular) nodes.
Extrinsic control system: This is through the control of cardiac functioning through the sympathetic and parasympathetic divisions of ANS (autonomic nervous system). These neurons innervate cardiac muscle walls and SA, AV nodes. Both sympathetic and parasympathetic systems have opposite effect on heart.