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Nodes

node, sa

sinoatrial node. The pacemaker of the heart, located in the right atrium (upper chamber of the heart). The electrical signals initiated in the sa node are transmitted through the atria and the ventricles to stimulate heart muscle contractions (heartbeats).


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Why do neurones only have one axon?

... are insulated ( some are anyway) with a substance called myelin this enables very fast transmission and has gaps at regular intervals called nodes of ranvier where diffusion of ions can occur. If we had lots of axons there would be loads of gaps and the action potentials or nerve impulses ...

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by Drredfrizzle
Sun Nov 11, 2012 7:46 pm
 
Forum: Human Biology
Topic: Why do neurones only have one axon?
Replies: 1
Views: 2485

Re: [NEUROSCIENCE]-Two Questions about AP Propagation

I think the second question is referring to thicker axons having nodes of Ranvier and thus can perform saltatory conduction. This would decrease the need for Na+ channels. The answer to the first question sounds pretty reasonable.

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by hymenoptera7
Sun Aug 05, 2012 5:19 am
 
Forum: Human Biology
Topic: [NEUROSCIENCE]-Two Questions about AP Propagation
Replies: 5
Views: 5002

Theories - Origin of Life

... that a program be it genetic or otherwise does two things. 1) It uses natural forces which are governed by universal laws 2) It injects decision nodes into the process to over ride that natural progress and directs (governs) towards a specified goal. I’m not sure about “every scientist” – are ...

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by AstraSequi
Tue Mar 27, 2012 2:51 am
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 560
Views: 893444

Re: Theories - Origin of Life

... that a program be it genetic or otherwise does two things. 1) It uses natural forces which are governed by universal laws 2) It injects decision nodes into the process to over ride that natural progress and directs (governs) towards a specified goal. He then goes on to state as if it were a fact ...

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by scottie
Mon Mar 19, 2012 4:42 pm
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 560
Views: 893444

I need diagnosis and treatment

... that she has a disease unexplained by her doctors. She has a lump on her left side of the neck and according to her, it is due to enlarged lymph nodes. She had been staying in hospital since April, and she is now going to school. She still feels dizzy when she stands up for more than 10 seconds ...

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by Mingled
Sun Sep 25, 2011 10:15 pm
 
Forum: Human Biology
Topic: I need diagnosis and treatment
Replies: 1
Views: 2459
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