I have 25 pairs of values. I have a gradient and want to test if this gradient is significantly different from 1. Which stats test do I use? I thought of using a one-sample t-test, but how are you meant to put 25 gradients in the test!??? thanks...
Hi. Please help. I'm struggling to find the mass moment of inertia of an area.
Please see picture.
I already have the centroid of the area, and the exact area.
How would I find the mass moment of inertia of this area about its centroid?
I tried using AutoCAD, but it gives you the...
Hi guys, just wondering whether you could help. I've got a complex number in terms of a lot of variables, and need to separate it into its real and imaginary parts. How do I do that? I spent past hour trying to look for tutorials, unfortunately none tells you how to do it...
we had a lecture on intelligent design (or should I say - one against ID). the lecturer went into great detail as to how some complex systems that are apparently irredicubly complex can actually be taken apart, and the system still works. e.g. the blood clotting system.
what I don't...
a neuromuscular junction is an atypical chemical synapse:it is much simpler, with only one postsynaptic receptor type, only excitatory signals, and often endplate potentials are suprathreshold so 1AP => 1 contraction.
therefore what you've argued does not apply to the neuromuscular junction?
Is it correct to say:
signal along muscle is electrical because we want a 1:1 process i.e. 1AP=1contraction, if grading of AP occured then the system would not work as you cannot have a half contracting muscle
but at the neuromuscular junction, you either get a contraction, or you don't; and...
This is about voltage clamping:
When Hodgkin and Huxley voltaged clamped a nerve - when hyperpolarised there was a small inward current, why is that?
and when they used a depolarising clamp, there is firstly a brief capacitative current - this current is outwards, why?:confused:
But wnat you just said does not argue against a purely electrically based system. Axons travel much slowly because it's not a current (well except for passive conduction) but is achieved electrochemically.
Surely such biological systems with only electrical connections would still work if you prevent cross-interference between signals (we already have those in nerve fibres - signals travel in opposite directions but the signals are insulated by myelin). So why can you not extend this network to...
Is chemical coordination more complex then? I've always though an electrical system is more recent and complex (which is why we have it in the brain).
Why do you need chemical transmission at the neuromuscular junction though? We have current neurotransmitters which bind to AChR sites for...
Transmission of a message electrically can work if we put extra myelin sheath around axons.
So you are saying chemical transmission represents an analogical system?
I can see your point. But we have electrical synapses in the brain, so why won't it work for the rest of the body, presumbly...
I know the question asks why the nerve transmission is electrical, but I don't think it wants 'because its due to charged particles'. It's asking for adv. and disadv between the two.
I've had discussions with others - but an electrical homeostatic system can work but we just haven't evolved one.