Week 8 HEART worksheet

Week 8 HEART worksheet - Heart Cardiac Muscle Intercalated...

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Heart  Cardiac Muscle  
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Intercalated disks  Gap junctions  - hold cells together -  direct communication  between cells  Gap junctions  Areas of low electrical resistance  Electrical synapse  - communication narrow synaptic cleft  No delay  Intercellular bridges - leads to anatomical continuity  Intercalated disk  Not very flexible  Functional syncitium  -  contracts as if it was a single unit  - different parts of  cells come together and contract  Gap Junctions  Seen in cardiac muscle - no sarcomeres  Smooth muscle  Skeletal muscle - active anaerobic ; breaks down glycogen; sarcoplasmic  reticulum  Cardiac Muscle  Abundant mitochondria  Extensive blood supply  Metabolism resting -  Aerobic   Lipid based  Cardiac Muscle  Contractions   Involuntary  Contractions different than skeletal muscle  No summation in cardiac; no tetany Cardiac Cycle 
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1 heart beat  Takes approximately  0.8 seconds   About 60 beats/min  Less than 60 beats/min is  bradycardia  Greater than 100 beats/min is  tachycardia  Cardiac Cycle  Broken down into  diastole  and  systole   Cardiac Cycle  Diastole   Relaxation 0.5 seconds  Cardiac Cycle  Systole  Contraction 
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This note was uploaded on 02/11/2010 for the course AHS 132 taught by Professor Klinger during the Spring '09 term at Nassau CC.

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Week 8 HEART worksheet - Heart Cardiac Muscle Intercalated...

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