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iono
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What are sensory receptors?
A sensory receptor is a sensory nerve ending that responds to a stimulus in the internal or external environment of an organism. The sensory receptor initiates sensory transduction by creating graded potentials or action potentials in the same cell or in an adjacent one.
Which membrane potential occurs because of the influx of Na plus through chemically gated channels in the receptive region of a neuron?
An excitatory postsynaptic potential, a type of graded potential, occurs because of the influx of Na+ through chemically gated channels in the receptive region, or postsynaptic membrane, of a neuron. Graded potentials are generated by chemically gated channels, whereas action potentials are produced by voltage-gated channels.
Do action potentials become weaker with distance?
action potentials are non-decremental and do not get weaker with distance.
What do intercalated discs transfer from cell to cell?
action potentials, ionic currents, the force of contraction and ionic currents and action potentials only
Where do most local potentials happen?
dendrites
What potentials are short-lived and decremental?
graded (local) potentials
Can graded potential form on receptor endings?
Yes, Graded potentials (otherwise known as postsynaptic potentials) can form on receptor endings.
Are graded potentials the same as local potentials?
Postsynaptic potentials are changes in the membrane potential of the postsynaptic terminal of a chemical synapse. Graded potentials are changes in membrane potential that vary in size, as opposed to being all-or-none, and are not postsynaptic potentials.
What potentials are short-livedlocal changes in membrane potential that can be either depolarized or hyperpolarized?
Graded Potentials
How does an action potential differ from a graded potential?
Action potentials also known as spikes, differ from graded potentials in that they do not diminish in strength as they travel through the neuron.
Where do graded potentials occur?
On the dendrites and subsequently the soma (body) of neurons.
What is occurring between the dendritic end and the axon hillock?
conduction and summation of graded potentials.
An intensely painful stimulus is distinguished from a mildly painful one by:?
a higher frequency of action potentials initiated.
A small deviation from the resting membrane potential that makes the membrane more or less polarized?
graded potentials
What kind of gated channels are involved in the generation of graded potentials?
chemically regulated gates, voltage regulated gates
Do graded potentials increase amplitude as they move away from the stimulus?
No, they actually decrease in amplitude as they move away from the stimulus point.
What is a Difference between hyperpolarizing and depolarizing graded potential?
hyper is more and de- is less. in relation to action potentials, the resistance increases and decreases.
