scilearner

Ok so when I pass electricty through salt water the negative ions move from highly negative area to positive area causing a current? My question is why do the move? Let's say there was Sodium and Chloride ions in water. Can't the chloride ion give an electron to sodium and make the whole solution deionized, why do they choose to move instead? Thank you

This is the action potential duration of a normal cardiac myocyte Here are the potential pace makers. * SA node: 80 - 100 bpm * Atrial foci: 60 - 80 bpm * Junctional foci: 40 - 60 bpm * Ventricular foci: 20 - 40 bpm 1. First of all let's say ventricular foci is the pacemaker. Why does it give a low heart beat? Is it because it decreases the duration of the action potential or frequency of the signal? 2. When heart rate is increased by nerves, the action potential duration decreases, I want to know how this occurs? How can nerves control the ions in the extracellular medium? or do they control the sodium channels? I'm just interested in how an action potential can be shortened. Thank you

Hello everyone, Ok so electricty must flow through ions in the body right, I have some questions about this. From what I researched this is my understanding of it, please correct me if I'm wrong. When electricity passes to your body, the positive ions migrate towards the negative charged area and gains electrons while negative ions migrate towards positively charged area and releases them. Now I have some questions about that. 1.Can't the positive ions gain electrons and completely neutralize the current? 2. If the positive ions move towards the negative side and balance the charges at both ends, wouldn't that neutralize the current, why do redox reactions occur to keep a current going? 3. Electricity is movement of electrons, here the ions are moving so can we really say the electricity is conducted in the ionic solution? 4. I also like to know when a hair fryer is placed on water (obviously not for real), how does water conduct the electricity, using my logic where do the negative ions release electrons, I mean what is their to gain them? Thank you

Thanks Genecks that was exactly what I was after However that raises few questions "random temperature-related jiggling" So does this mean some neurotransmitters stay connected with the receptor. How does it release the neurotransmitter at the right time if this is a random process? Can you give an example of temperature jiggling. Thanks a lot for the answer though

Thanks skeptic I appreciate your time in answering my questions

Thank you everyone who helped but problem is not with the reuptake process. It is not that difficult to understand it once the neurotransmitter is released into the synaptic cleft but nothing mentions how it get released there. For example from iNow link Now what makes the neurotransmitter break its bond with the receptor and diffuse away. Reuptake by a transport proteins is not what I after. Just how the neurotransmitter goes back to the synaptic cleft. Thanks and sorry for not making myself clear before

What makes it release back into the synpatic cleft? Also in other scenarios I have seen some ligand or something attaches to a receptor and then get released without any mention why it happened? If anyone can help. It would be great. Thanks

So new skin cells push out old cells making them fall, then why does hair grow very long, wouldn't the new cells produced push the old ones and make them fall?

Thanks for the response Skeptic So skin cells shred primarily not because they are dead, even living cells wear off like bone, is that what you meant by emphasizing dead cells?

Hello guys, I know they are dead cells, but how come all the dead cells don't fall and only some do. If these cells are attached by cell adhesion molecules how do they fall? Are these adhesion molecules broken or something? Thank you

Hello guys, Although the response of a motor unit is all-or-none, the strength of the response of the entire muscle is determined by the number of motor units activated. Nerve impulses passing down a single motor neuron will thus trigger contraction in all the muscle fibers at which the branches of that neuron terminate. and this is a motor unit. 1.My question is some organs are supplied only with one motor neuron, is it impossible for them to control the strength of their contraction? 2.Also this is just about the central nervous system. Since CVS has many nerves which are branches of other nerves, when an action potential is sent how come this action potential doesn't travel through the branches and innervate unnessecary structures? Thanks for anyone who is going to help

In this collision Before= p=100 kg m/s---> <-----p=120 kg m/s After= <--combined unit P= 20 kg m/s In this question when I work out the change in momentum for 2 objects it is not the same. When there is a combined unit travelling after the collision can't you find the change in momentum?

Hello guys, So there are hydrogen ions inside the cell which is pumped out in cellular respiration. Now my question is when they say hydrogen ions are inside the cell are these actually dissolved in water, ions can not exist without being dissolved right, why is that they are so reactive otherwise. Also in diffusion when they say hydrogen ions are taken in by the cell, does water come with it because they are dissolved. So does osmosis and ion diffusion occur together. Thanks

There are 2 types of intelligence I suppose 1. Just academic stuff 2. Understanding life I think number 2 would have a positive effect on number 1 and make you happy but not vise vera. I'm very bad at both but I'm quite happy I think I'm bit below average and happy however I love spending time on forum and improving my intelligence.

Hello guys, I always thought it did but it seems that it is actually a consequence of acidosis. According to this article http://www.unm.edu/~lkravitz/Article%20folder/lactate.html The article sounds right. So I was thinking the wrong thing all the time. Thanks

One way muscle grows is muscle hypertrophy where sarcoplasmic fluid increases inside the muscle cell. Wouldn't this burst the cell membrane, I can understand how organelles can replicate but what about the cell membrane. I know this sounds like a stupid question but please help. Thanks

Hello guys, So is tetany repeated involuntary contractions or just one smooth contraction? If the rate of action potential is rapid wouldn't that give repeated contractions? Also cardiac muscle doesn't have tetany for some reason? Thanks for anyone who can improve my understanding of tetany. Thanks!!

If your skin is cut deeply, meaning a cut to dermis why is that we can see scar tissue. I mean if the cut region in the dermis would be replace by scar tissue, but the epidermis region above that would have normal epithelial cell because they can divide easily. So if the epidermis grows back normally how can we see scar tissue? Thanks

Is the spongy bone covered by compact bone? I mean is it only when you cut the top bit(compact bone) you can see the spongy bone? I know the pics are self explanatory but just like to clarify. I hope you don't mind. Thanks Merged post follows: Consecutive posts mergedYes it is. Compact bone tissue forms the external layer of all bones . Sorry guys I take responsiblity for not doing research before hand. I actually did but only now did I find it.

Hello guys, This might seem a basic question but my physics is not that good. So in a normal pipette when you squeeze the top bit, do you create an area of high pressure there, and then when you put in a flask with liquid and release it the air escapes, and then the atmospheric air pushes on the liquid and fluid comes into the pipette. Is that what happens? Thanks

Oh I get it the car wants to travel in a straight line and it is the centripetal force that keeps it in a circle. Thanks swansoft But where is the centrifugal force of earth coming from to stop it from getting sucked into the sun? For example let's say sun just shut down the earth would travel in a straight line, why would it do that, what made it move in the first place, was it once stationary?

Hello guys, I wasn't interested in these stuff those days and I never got it. Now when you do a car turn the friction from the tires provide the centripetal force right. I have few quick questions. How does the friction from tires give a force in the centripetal direction, how come it is not in the direction that is opposite to velocity direction? If the centripetal force is towards the centre why is car going in a circle, wouldn't it be sucked into the centre, Am I missing some resulting forces? Thanks guys

if I get a paper and blow on top of that. The air would move faster and it would lift but why is it that only air in the bottom pushes the paper, what about the air above the region I'm blowing can't that push down on the paper. Thanks PS: While we are at it why exactly does air move faster in long distance, like aeroplane wing?

Hello guys, This is from an article I recently read. I have not done any aerodynamics but I'll be so greatful if anyone can explain what this guy means. What I'm thinking is if turbulent air delays the separation of air and the smooth air separates wouldn't the ball swing to the smooth side first and then to the turbulent side when that separates. Also why does turbulent air have lower pressure, in a tube if a fluid is turbulent wouldn't it exert higher pressure on the walls. Thanks guys

Hello guys, I checked coagulation but I can't find the explanation of how blood (serum) suddenly turn into solid? How does this occur? Thank you!!