Heart - Cardiovascular System: The Heart...

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Cardiovascular System: The Heart Functions of the Heart o Produce a force that causes blood to circulate Size, Shape, Location of the Heart o Size: closed fist o Shape: blunt cone o Location:  Lies obliquely in the mediastinum; left od sternum Base (flat part of heart) is deep to 2 nd  intercostal space Apex (round pointed end of heart) extends into 5 th  intercostal space Anatomy of the Heart o 2 atria (thin walled, superior, posterior) + 2 ventricles (thick- walled, inferior, anterior) o Pericardium Superior to deep: Fig. 20.2, pg 677 Fibrous pericardium Parietal pericardium Pericardial cavity Visceral pericardium Fibrous + serous pericardium surrounds heart Fibrous: holds heart in place Fibrous connective tissue Serous: reduces friction during heart beats Thin, transparent simple squamous epithelium Parietal: lines fibrous pericardium Visceral: lines exterior heart Pericardial cavity: btwn parietal and visceral, filled  with serous pericardial fluid, which reduces friction  as the heart beats  o Heart Wall (Fig 20.4, pg 679) 3 layers: Outer epicardium (visceral pericardium): protection  against friction of other organs Middle myocardium: contraction; composed of  cardiac muscle cells Inner endocardium: reduces friction of blood in heart Atria: smooth inner surface Auricles: in each atrium, a flap btwn atrium and ventricle,  has ridges of muscle (pectinate muscles) Smooth surface is separated from pectinate muscles  by a ridge (crista terminalis) Ventricles: larger muscular ridges (trabeculae carneae) o Coronary Circulation - 1 -
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Cardiovascular System: The Heart Coronary sulcus: separates atria and ventricles Interventricular grooves/sulcus (anterior + posterior):  separate left and right ventricles Coronary arteries: branch of aorta, supply heart Anatamoses: direct connections btwn branches of arteries o Heart Chambers and Valves (Fig 20.7, pg 682) Interatrial septum: separates the 2 atria Interventricular septum: separates the 2 ventricles Tricuspid valve: separates right atrium and right ventricle
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This note was uploaded on 01/16/2012 for the course KINESIOLOG 1Y03/1YY3 taught by Professor Parises during the Spring '11 term at McMaster University.

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Heart - Cardiovascular System: The Heart...

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