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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: Human Anatomy & Physiology II
Professor: Renee dickie
Term: Fall 2018
Tags:
Cost: 25
Name: week 5
Description: cardiovascular
Uploaded: 10/02/2018
2 Pages 196 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

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 -60If you want to learn more check out What is forced choice method of performance appraisal?
If you want to learn more check out What are some human activities that degrade natural capital?

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+  Don't forget about the age old question of What are the 3 main areas of cognitive development that occur during adolescence?
Don't forget about the age old question of What are the mental aspects used in sports psychology?

LEAVES

∙ *REPOLARIZE  

OF MEMBRANE  TO K+  

∙ INCREASE  

MEMBRAN  We also discuss several other topics like Did the english bill of rights limit the power of the monarchy?
We also discuss several other topics like What stops the stimulation for muscle contraction?

PERMEABILITY  TO NA+

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