Bio47S11HO22

Bio47S11HO22 - Biology 47 - Anatomy Lecture 22...

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1 Biology 47 - Anatomy Lecture 22 Cardiovascular Systems Cardiac Structure : 1. Cardiac Muscle Cells : Myocardial cells a. Striated : Overlapping : b. c. Intercalated Discs : Junctional proteins Macula Adherens (Desmosomes) : Interconnect cells: Origin and insertion are : Gap Junctions : Interconnect cells : Electrical signals travel from one myocardial cell to : Functional Syncyticum : syn = together; cyt = cell a. Macula Adherens : b. Gap Junctions : c. Branching : > Creating a web of pulling cells Significance : Myocardial cells function as a single unit 1. One cell stimulated = 2. All interconnected cells pull on each other = Myocardial arrangement : 1. Atrial Myocardium : 2. Ventricular Myocardium : 3. Cardiac Skeleton:
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2 Location: Cardiac Conduction System : Significance : 1. Initiate : 2. Synchronize : Atria contract : Atria: Fill ventricles BEFORE : • 2 populations of specialized myocardial cells 1. Nodal Cells : Initiate : Stimulate: Establish: 2. Conducting Cells : Rapidly distribute : Conduction System: Components A. Sino Atrial Node : S.A. Node Function : Initiates : Location : Superior/Lateral corner Current movement : Spreads from : Current contained in Atria by : Result : B. Atrioventricular (AV) Node Function: a. Slows Electrical Current Allows complete :
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3 Location
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Bio47S11HO22 - Biology 47 - Anatomy Lecture 22...

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