Cardiovascular - 23 24 Cardiovascular System 1 Heart...

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23 & 24: Cardiovascular System 1. Heart + vessels + blood a. Heart is pump i. Provides force to generate bloodflow ii. 2 circuits: 1. Pulmonary: carry blood to and from lungs 2. Systematic: carry blood to and from all body tissues b. Vessels are the tubing i. Designed to carry blood c. Blood transports required factors needed by tissues/cells in body i. O2 & CO2 ii. Nutrients and waste iii. Hormones iv. Immune cells 2. Heart Anatomy a. Lies within the mediastinum b. 3 layers of pericardium (sac that encloses the heart) i. Fibrous pericardium: outer layer 1. Dense connective tissue ii. Parietal pericardium: middle layer 1. iii. Visceral pericardium: inner layer 1. Epithelium, iv. Visceral + parietal pericardium = serous pericardium v. Pericardial cavity lies between visceral & parietal c. Structure of the heart wall
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i. Epicardium: visceral layer of serous pericardium 1. Infiltrated with fat 2. Dense connective tissue ii. Myocardium:forms bulk of heart 1. Cardiac muscle tissue 2. Layer that contracts iii. Endocardium: located deep to the myocardium 1. Simple squamous epithelial resting on connective tissue 3. 4 chambers of the heart a. Atria i. Receives venous drainage 1. Right – receives venous flow from 3 veins a. Superior and inferior vena caza b. Coronary sinus 2. Left – receives venous flow from 4 pulmonary veins a. 2 left and 2 right pulmonary veins b. Ventricles i. Eject blood ii. Right ventricle: to lungs 1. Delivers blood to pulmonary trunk iii. Left ventricle: systemic circulation 1. Delivers blood to aorta iv. Ventricles contain trabeculae carnae and papillary muscles c. Septa: separate chambers
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4. Heart Valves a. Regulate blood flow i. Atrioventicular valves 1. Between and an atrium and ventricle a. Tricuspid valve (right AV valve) b. Bicuspid valve (left AV valve) ii.
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