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TOWSON / Biology / BIOL 222 / What cells are autorhythmic?

What cells are autorhythmic?

What cells are autorhythmic?

Description

School: Towson University
Department: Biology
Course: Anatomy & Physiology
Professor: Renee dickie
Term: Fall 2018
Tags:
Cost: 25
Name: week 5
Description: cardiovascular
Uploaded: 10/02/2018
2 Pages 50 Views 3 Unlocks
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csteck2 (Rating: )



CARDIAC MUSCLE (CARDIOCYTES)


What cells are autorhythmic?



∙ STRIATED, BRANCHED

∙ INTERCALATED DISCS: CONNECT CELLS TO EACHOTHER  o DESOSOMES (RESISTANT TO PULING; KEEP CELL 

TOGETHER)

o GAP JUNCTIONS (TUNNELS FOR IONS)

o FUNCTIONAL SYNCYTIUM 

 ALL WORKING TOGETHER 

∙ MYOGLOBIN (BINDS O2 IN CELLS)

∙ MANY MITOCHONDRIA (AEROBIC)

o 25% OF VOLUME

 60% ATP­ FATTY ACIDS 

 35% ATP­ GLUCOSE

∙ CONTRACT IN RESPONSE TO ACTION POTENTIALS GENERATED  BY AUTORHYTHMIC CELLS (PACEMAKER CELLS) 

∙ TYPES OF CELLS 

o AUTORHYTHMIC CELLS (1%)

 CONDUCT ELECTRICAL SIGNALS


Do intercalated discs have gap junctions?



o CONTRACTILE CELLS (CARDIOCYTE)

 99% OF HEART 

 CONTRACT (PUMP BLOOD) 

∙ CONNECTIVE TISSUE 

o PHYSICAL SUPPORT

o PREVENTS OVERSTRETCHING 

o DISTRIBUTE CONTRACTION FORCES 

o **ELECTRICALLY INSULALTES ATRAI FROM VENTRICLES   SEPARATES TOP FROM BOTTOM If you want to learn more check out What role does psychology play in criminal justice?
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CONDUCTION SYSTEM 

∙ SINOATRIAL NODE = PACEMAKER

∙ ATRIOVENTRICULAR NODE

∙ AV BUDNLE; BUNDLE BRANCHES; PERKINJE FIBERS **ALL CELLS ABLE TO SPONTANEOUSLY DEPOLARIZE** ∙ PACEMAKER POTENTIAL

o CELLS CANNOT MAINTAIN A STABLE RESTING 

MEMBRANE POTENTIAL 

0


Which node is known as the pacemaker?



40 -60

CA2+  

CHANNEL S CLOSE

∙ NA+ LEAK IN;  K+ LEAK  

CHANNELS  

CLOSE

∙ REDUCE  

PERMEABILITY  

∙ VOLTAGE  

GATED CA2+  CHANNELS  

OPEN; CA2+  ENTERS

∙ *DEPOLARIZE

∙ VOLTAGE  

GATED K+  

CHANNELS  

OPEN, K+  

LEAVES

∙ *REPOLARIZE  If you want to learn more check out What are the 3 main areas of cognitive development that occur during adolescence?

OF MEMBRANE  TO K+  

∙ INCREASE  

MEMBRAN  If you want to learn more check out How was james ii an absolute monarch?
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PERMEABILITY  TO NA+

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