### Understanding Graded Potentials and Action PotentialsIn the context of neural physiology, understanding the mechanisms of graded potentials and action potentials is fundamental. A graded potential that achieves the threshold leads to the generation of an action potential. To test your knowledge, consider which of the following statements regarding graded and action potentials is/are true:1. **Graded potentials result from the opening of chemically gated sodium channels.**2. **Action potentials result from the opening of voltage-gated sodium channels.**3. **Graded potentials result from the opening of calcium-gated channels and action potentials result from the opening of sodium-gated channels.**4. **a and b**Please select the correct answer from the options provided.### Explanation:1. **Graded Potentials**: These are changes in membrane potential that vary in size, as opposed to being all-or-nothing. They are often the result of the opening of chemically gated ion channels. 2. **Action Potentials**: These are rapid and uniform changes in membrane potential that propagate along the length of an axon. They are generally initiated by the opening of voltage-gated sodium channels when the membrane potential reaches a certain threshold.3. **Calcium-Gated Channels**: While calcium ions play a key role in various cellular processes, their influence on graded potentials is less direct compared to sodium ions through chemically gated channels.### Correct Answer:Option 4: **a and b**

Graded potentials are made by outside stimuli in sensory neurons or by neurotransmitters discharged…

A graded potential that achieves threshold leads to the generation of an action potential. Which one of the following statement/s regarding graded and action potentials is/are true? O graded potentials result from the opening of chemically gated sodium channels O action potentials result from the opening of voltage gated sodium channels O graded potentials result from the opening of calcium gated channels and action potentials result from the opening of sodium gated channels a and b Next

A graded potential that achieves threshold leads to the generation of an action potential. Which one of the following statement/s regarding graded and action potentials is/are true? O graded potentials result from the opening of chemically gated sodium channels O action potentials result from the opening of voltage gated sodium channels O graded potentials result from the opening of calcium gated channels and action potentials result from the opening of sodium gated channels a and b Next

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

See similar textbooks

Similar questions

What is the membrane threshold and describe its role with grade potential's in action potential's
You find a neuron whose resting potential is -90mV. Which of the following are likely to be true? (select all that apply) Voltage-gated sodium channels are closed The neuron is fully permeable to sodium The neuron is permeable to potassium The neuron is hyperpolarized
Membrane permeability at the rising phase of an action potential is dominated by: O Co-transporters Nongated Channels O K+ Voltage-gated Channels O Na+ voltage-gated Channels O Chemically-gated Channels
B A C Match the action potential phase in the plot below with the correct image below showing the Na+/K+ ATPase and voltage-gated K+ and Na+ channels. +50- D -50- -70- 0 E A B M D + OUT -IN [Choose ] [Choose] [Choose] SHE - OUT IN + OUT IN
As the axonal membrane depolarizes during the rising phase of an action potential, the amplitude of Na+ conductance changes from large to small the amplitude of Na+ conductance changes from small to large there is no Na+ conductance during this phase of the action potential the amplitude of Na+ conductance remains large and constant throughout
What is Membrane potential t how does it function for what? is it considered an nd action potential P
channels are specifically attuned to the action The voltage-gated potential threshold. O cr Na* O K* O Ca2+
If a potassium channel is held open for even longer, leading to an even bigger hyperpolarization of the cell what will happen in an afferent neuron? action potentials will have a larger amplitude action potentials will have a small amplitude less frequent action potentials in the neuron more frequent action potentials in the neuron
Which of the following statements is FALSE? a. graded potentials can sum over time and space, action potential cannot b. action potentials have refractory periods, graded potentials do not c. action potentials are all-or-none, graded potentials are not d. graded potentials and action potentials are caused by ions moving through open channels e. all of the above statements are true (if all of the above are true this is the correct answer) ....
Of the following, which must be true for an action potential? I - Action potentials only occur when the threshold potential has been exceeded.II - A stimulus produces a full action potential, or does not produce an action potential at allIII - During the undershoot phase, it is much harder to fire another action potential I, II, and III I only I and III II and III
Which of these ions is actively transported through the cell membrane to re-establish a resting potential? K and Mg Na and K Mg and Cl Ca and Cl
An increase in the magnitude of depolarization by a graded potential will increase the threshold potential increase the duration of an action potential increase the frequency of action potentials two of the above