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Metropolis 
Forum Senior Member
Joined: December 20 2004
Location: Scotland
Status: Offline
Points: 760
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 Topic: Anatomy 101
Posted: February 12 2005 at 09:05 |
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That would make my future career a bit easier
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We Lost the Skyline............
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mirco
Forum Senior Member
Joined: January 04 2005
Location: Venezuela
Status: Offline
Points: 819
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Posted: February 12 2005 at 08:33 |
 Metropolis wrote:
Um, actually defibrillators STOP your heart, in order to allow the natural pace maker to take over again. It's really electrochemical, not completely electrical, the potential differences being created by varying chemical concentrations, 'tis a complex process
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I presume that future generation will come with a reset button...
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Please forgive me for my crappy english!
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Metropolis
Forum Senior Member
Joined: December 20 2004
Location: Scotland
Status: Offline
Points: 760
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Posted: February 12 2005 at 06:46 |
maani wrote:
Actually, you are not entirely correct about
what makes the heart beat. Although it is true that certain
chemicals make cause contractions and expansions, what makes the heart
beat is an "electrical" impulse that "sets off" the chemicals that
permit contraction and expansion of the muscles. This is why
getting certain types of electric shocks can stop your heart, and why a
defibrillator works (by literally "jump-starting" the "battery").
As an aside, it is also why certain types of martial arts blows can
kill; those blows are targeted at the heart, and the result of the blow
is to stop the electrical impulse that keeps the heart going.
Peace. |
Um, actually defibrillators STOP your heart, in order to allow the
natural pace maker to take over again. It's really
electrochemical, not completely electrical, the potential differences
being created by varying chemical concentrations, 'tis a complex process
Edited by Metropolis
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We Lost the Skyline............
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Sweetnighter
Forum Senior Member
Joined: October 24 2004
Location: United States
Status: Offline
Points: 1298
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Posted: February 12 2005 at 00:35 |
DallasBryan wrote:
very good!!!
and now the breath of life? why do we breathe? |
Breathe, breathe in the air.
Don't be afraid to care.
Leave but don't leave me.
Look around and choose your own ground.
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I bleed coffee. When I don't drink coffee, my veins run dry, and I shrivel up and die.
"Banco Del Mutuo Soccorso? Is that like the bank of Italian soccer death or something?" -my girlfriend
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maani
Special Collaborator
Founding Moderator
Joined: January 30 2004
Location: United States
Status: Offline
Points: 2632
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Posted: February 12 2005 at 00:30 |
My teeth itch... 
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Bryan
Special Collaborator
Honorary Collaborator
Joined: April 01 2004
Status: Offline
Points: 3013
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Posted: February 12 2005 at 00:05 |
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My brain hurts.
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maani
Special Collaborator
Founding Moderator
Joined: January 30 2004
Location: United States
Status: Offline
Points: 2632
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Posted: February 11 2005 at 18:52 |
Actually, you are not entirely correct about what makes the heart beat. Although it is true that certain chemicals make cause contractions and expansions, what makes the heart beat is an "electrical" impulse that "sets off" the chemicals that permit contraction and expansion of the muscles. This is why getting certain types of electric shocks can stop your heart, and why a defibrillator works (by literally "jump-starting" the "battery"). As an aside, it is also why certain types of martial arts blows can kill; those blows are targeted at the heart, and the result of the blow is to stop the electrical impulse that keeps the heart going.
Peace.
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Glass-Prison
Forum Senior Member
Joined: February 08 2004
Location: Canada
Status: Offline
Points: 453
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Posted: February 11 2005 at 17:33 |
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To please the four humeurs!
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Sun Tsu said: To fight and conquer in your battles is not supreme excellence; supreme excellence consists of breaking the enemy's resistance without fighting.
Sun Tsu: The art of War
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DallasBryan
Forum Senior Member
Joined: November 23 2004
Location: United States
Status: Offline
Points: 3323
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Posted: February 11 2005 at 16:23 |
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very good!!!
and now the breath of life? why do we breathe?
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mirco
Forum Senior Member
Joined: January 04 2005
Location: Venezuela
Status: Offline
Points: 819
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Posted: February 11 2005 at 14:24 |
Oh, progheads are geekers than I suppose...  
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Please forgive me for my crappy english!
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tuxon
Forum Senior Member
Joined: September 21 2004
Location: plugged-in
Status: Offline
Points: 5502
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Posted: February 11 2005 at 14:09 |
The heart beats independently of the brain's function. Therefor when you rip a heart out of a living frog it will keep beating for a couple of seconds. Of course it will stop due to lack of energie. The bigger the heart the sooner it will stop beating.
BTW. It is considered cruelty to rip hearts out of living organisms, so don't go out to test this hypothesis.
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I'm always almost unlucky _ _ _ _ _ _ _ _ Id5ZcnjXSZaSMFMC Id5LM2q2jfqz3YxT
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Certif1ed
Special Collaborator
Honorary Collaborator
Joined: April 08 2004
Location: England
Status: Offline
Points: 7559
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Posted: February 11 2005 at 14:04 |
tuxon wrote:
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37839-81-9 |
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| EINECS NO. |
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| FORMULA |
C10H12N5O6P·Na |
| MOL WT. |
477.39 |
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H.S. CODE |
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TOXICITY |
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| SYNONYMS |
cAMP, Sodium; Cyclic adenylic acid, Sodium; |
Adenosine : a purine nucleoside composed of adenine linked by its N9 nitrogen to the C1 carbon of ribose. It is a component of ribonucleic acid and its nucleotides (AMP., ADP, ATP, cAMP) play important roles in biochemical processes such as synthesis of nucleic acids and proteins, photosynthesis, muscle contraction and intracellular signal transduction
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Can you get high on that?
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Metropolis
Forum Senior Member
Joined: December 20 2004
Location: Scotland
Status: Offline
Points: 760
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Posted: February 11 2005 at 13:55 |
indeed, it intracellularly signals for more calcium to move into the
cell, and that causes contraction (or more accurately allows
contraction to occur by binding to troponin on topomyosin and freeing
up the myosin binding sites on the actin molecule) 
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We Lost the Skyline............
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tuxon
Forum Senior Member
Joined: September 21 2004
Location: plugged-in
Status: Offline
Points: 5502
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Posted: February 11 2005 at 13:52 |
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37839-81-9 |
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| EINECS NO. |
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| FORMULA |
C10H12N5O6P·Na |
| MOL WT. |
477.39 |
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H.S. CODE |
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TOXICITY |
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| SYNONYMS |
cAMP, Sodium; Cyclic adenylic acid, Sodium; |
Adenosine : a purine nucleoside composed of adenine linked by its N9 nitrogen to the C1 carbon of ribose. It is a component of ribonucleic acid and its nucleotides (AMP., ADP, ATP, cAMP) play important roles in biochemical processes such as synthesis of nucleic acids and proteins, photosynthesis, muscle contraction and intracellular signal transduction
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I'm always almost unlucky _ _ _ _ _ _ _ _ Id5ZcnjXSZaSMFMC Id5LM2q2jfqz3YxT
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Metropolis
Forum Senior Member
Joined: December 20 2004
Location: Scotland
Status: Offline
Points: 760
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Posted: February 11 2005 at 13:48 |
Well, yes, that is an intracellular messenger who's production is
stimulated by adrenaline and noradrenaline that results in contraction
of cardiac muscle
were all such geeks
Edited by Metropolis
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We Lost the Skyline............
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tuxon
Forum Senior Member
Joined: September 21 2004
Location: plugged-in
Status: Offline
Points: 5502
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Posted: February 11 2005 at 13:46 |
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adenosine 3', 5'-cyclic monophosphate
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I'm always almost unlucky _ _ _ _ _ _ _ _ Id5ZcnjXSZaSMFMC Id5LM2q2jfqz3YxT
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Metropolis
Forum Senior Member
Joined: December 20 2004
Location: Scotland
Status: Offline
Points: 760
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Posted: February 11 2005 at 13:43 |
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cells in the sinoatrial node which depolarize spontaneously (with hormonal and nervous influences on the rate)
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We Lost the Skyline............
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tuxon
Forum Senior Member
Joined: September 21 2004
Location: plugged-in
Status: Offline
Points: 5502
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Posted: February 11 2005 at 13:38 |
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sinus
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I'm always almost unlucky _ _ _ _ _ _ _ _ Id5ZcnjXSZaSMFMC Id5LM2q2jfqz3YxT
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DallasBryan
Forum Senior Member
Joined: November 23 2004
Location: United States
Status: Offline
Points: 3323
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Posted: February 11 2005 at 13:37 |
mirco you rocket scientist, you are correct on the first
entry. Brilliant!!!
the heart is a muscle, why does it beat? what keeps
it moving?
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Certif1ed
Special Collaborator
Honorary Collaborator
Joined: April 08 2004
Location: England
Status: Offline
Points: 7559
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Posted: February 11 2005 at 13:30 |
Skin.
Up.
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Anatomy 101
