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Why is the outside of a nerve cell always more positive than the inside?
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How does nerve fiber become depolarized?
A nerve fiber becomes polarized when the resting potential of the membrane changes. It starts out with an unequal distribution of charges- the outside is more positive and the inside is less positive. (Sodium (Na+) is in a higher concentration on the outside of the membrane and Potassium (K+) is in a lower concentration on the inside of the membrane.) A stimulus changes the gradient- when more Na+ flows in, the resting potential changes and polarization occurs, allowing for an action potential to be propagated down the axon.
What is a specialized nerve endings in sensory nuerons that detect changes inside and outside the body called?
dendrites
What ion determines the resting membrane potential of nerve and muscle?
The concentrations on Na+ outside the cell and concentrations of K+ inside the cell determine the resting membrane potential.
Why femoral nerve lies outside from femoral triangle?
The femoral sheath is a downward prolongation of abdominal fascial lining into the lower limbs. It covers the femoral vessels and lymphatics for about 1.5 inches into the thigh. But the femoral nerve, which is the principal nerve of lower limb, lies outside this sheath. The reason is that the major nerves lie outside the fascial envelope.
Influx of Na plus till 70mV?
The electrical potential difference across a cell membrane (the resting potential) is around -65 mV, inside negative. In nerve cells (neurones) or muscle cells this potential difference is reversed during an action potential. Sodium (Na+) channels open and Na+ ions enter the cell down their concentration gradient. This entry of positive charge depolarises the membrane ie it cancels out the resting pootential and then reverses it, so the potential becomes positive inside and negative outside, giving a potential of about +50mV.
How does nerve fiber become depolarized?
A nerve fiber becomes polarized when the resting potential of the membrane changes. It starts out with an unequal distribution of charges- the outside is more positive and the inside is less positive. (Sodium (Na+) is in a higher concentration on the outside of the membrane and Potassium (K+) is in a lower concentration on the inside of the membrane.) A stimulus changes the gradient- when more Na+ flows in, the resting potential changes and polarization occurs, allowing for an action potential to be propagated down the axon.
Type of Tissue that detects changes inside and outside the body and initiates and transmits nerve impulses?
Nervous tissue or Nerve Tissue
When the outside of a nerve is positively charged and the inside is negatively charged what is this called?
action potential
When a resting nerve fiber is polarized sodium and potassium ions is higher on the inside of its membrane?
A resting nerve fiber is polarized because the concentration ofNa+ is higher on the outside and K+ is higher on the inside.
Specialized nerve endings on sensory neurons that detect changes inside and outside the body are called?
receptors
What is a specialized nerve endings in sensory nuerons that detect changes inside and outside the body called?
dendrites
What should you do if a cranial nerve test is positive?
It all depends on what nerve and what it is positive for.
An electrical impulse moving down an axon is called?
This is called action potential. Action potential is the change in electrical potential that occurs between the inside and outside of a nerve or muscle fiber when it is stimulated, serving to transmit nerve signals.
What is depolarizing?
loss of polarization; especially : loss of the difference in charge between the inside and outside of the plasma membrane of a muscle or nerve cell due to a change in permeability and migration of sodium ions to the interior
Where is toadbert in bowser's inside story?
inside the nerve cluster
Why does the plasma membrane need to let gases in and out?
This membrane is like a gate keeper. It allows some things to go out and some to come in. The inside and the outside of the cell are not exactly the same. There are reasons for this. The nerve cells (neurons) would not function unless the amount of sodium is greater outside than inside. This produces an electrical gradient. Nerve impulses can be transmitted this way. The same is true for other types of cells.
Which nerve is affected with shingles on your hand and arm?
The location of the Herpes lesions will determine the nerve involvement. If the pain or numbness is on the "inside" of the arm and hand (the "pinkie" finger side), then it is ulnar in origin. If the symptoms appear on the "outside" of the hand and arm (the thumb side) then the nerve involved is the radial. Karin Ivester
