In The Hair cells.
Neuron has to be stimulated to the point of it's threshold in order for an action potential to be initiated and transmitted
The brain can influence the heart in two ways. Sympathetic and parasympathetic stimulation. Parasympathetic stimulation of the heart is through the vagus nerve. Sympathetic stimulation of the heart is via cervical and thoracic splanchnic nerves. The heart has its own pacemaker cells, so the brain only changes the rate and contractility of the heart.
Mechanical stimulation of a nerve physically opens ion channels in the cell membrane, allowing ions such as sodium and potassium to flow across the membrane. This creates a change in the electrical charge inside the nerve cell, leading to depolarization and generation of an action potential.
nerve impulse
a nerve impulse
Yes, when a receptor detects a stimulus, it triggers an electrochemical impulse to be sent along a nerve cell. This impulse travels to the brain where it is interpreted as a specific sensation or perception.
Electrical nerve stimulation
Sources of stimulation that can start a nerve impulse include chemical signals (neurotransmitters released at synapses), physical stimuli (such as pressure or temperature changes acting on sensory receptors), and electrical signals (generated by neighboring neurons or external electrical sources). These stimulations can trigger the opening of ion channels in the neuron's membrane, leading to changes in membrane potential and initiation of an action potential.
How does a nerve impulse follow the all-or-nothing principle???
There is a transfer from Radio waves (electrical energy) to Mechanical energy (sound). When you listen to a radio, the electromagnetic energy of the broadcast is converted to electrical current, also electromagnetic energy, which is converted to mechanical energy by the speaker. The vibration of the speaker (mechanical energy) is converted to sound energy (pressure waves) which travel through the air to your ear and is converted first to mechanical energy in your middle ear and then to pressure in a fluid in your inner ear. That fluid pressure wave is converted to mechanical energy as it stimulates the hair cells in your inner ear and they release a nerve signal. The nerve signal is electrical energy which it converted to chemical energy between each nerve sell and then back to electrical energy to flow through the nerve cell - so the nerve signal is electro-chemical energy. And that is processed by your brain to let you hear the sound of your radio.
nerve my a$$ nerve
Yes, an action potential is needed for a nerve impulse to occur.