Q4.7. Why does $Na^+$ enter the cell during the action potential? Because the $Na^+$ channels are open and only let $Na^+$ move from outside to inside Because the action potential pulls positive ions into the cell while $Na^+$ and $K^+$ channels are open Because $Na^+$ channels are open and allow $Na^+$ ions to move down the length of the axon to produce neurotransmitter at the axon terminal Because $Na^+$ channels are open and there is a higher concentration of $Na^+$ outside of the neuron than inside
Added by Jenny M.
Close
Step 1
Step 1: The question asks why $Na^+$ enters the cell during the action potential. Show more…
Show all steps
Your feedback will help us improve your experience
Md.Daniyal Arshad and 71 other AP CS educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Q4.3. Which ion channel is responsible for the rising phase of the action potential, and why? Na+ channels, because positive Na+ ions are at higher concentration outside the axon than inside, and so they enter the axon and raise Vm Na+ channels, because positive Na+ ions are at higher concentration inside the axon than outside, and so they leave the axon and raise Vm K+ channels, because positive K+ ions are at higher concentration outside the axon than inside, and so they enter the axon and raise Vm K+ channels, because positive K+ ions are at higher concentration inside the axon than outside, and so they leave the axon and lower Vm
Md.Daniyal A.
6) The falling phase of the action potential is due mainly to A) Na+ flow in the cell only. B) Na+ flow out of the cell only. C) K+ flow out of the cell only. D) K+ flow into the cell only. E) Na+ flow out of the cell and K+ flow into the cell. 7) Calcium is important in the synapse because it A) is necessary for acetylcholine synthesis. B) signals the exocytosis of the neurotransmitter. C) binds to receptors on the postsynaptic cell, opening ion channels, and triggering grade potentials. D) leaves the axon terminal, hyperpolarizing the cell. 8) The resting membrane potential results from A) uneven distribution of ions across the cell membrane only. B) differences in membrane permeability to ions only. C) activity of the sodium/potassium pump only. D) uneven distribution of ions across the cell membrane and differences in membrane permeability to ions. E) None of the answers are correct. 9) When comparing action potentials to graded potentials, you should remember that A) graded potentials can undergo summation. B) action potentials can undergo summation. C) that the rate of action potentials is limited by the refractory period. D) graded potentials can undergo summation and the rate of action potentials is limited by the refractory period. E) action potentials can undergo summation and the rate of action potentials is limited by the refractory period. 10) All of the following must occur before a second action potential can begin, EXCEPT A) the Na+ and K+ ions that moved in/out of the cell must move back to their original compartments. B) the Na+ inactivation gate must open and the Na+ activation gate must close. C) the absolute refractory period must occur. D) the Na+ and K+ ions that moved in/out of the cell must move back to their original compartments; the Na+ inactivation gate must open; and the Na+ activation gate must close. E) None of the answers are correct.
Sri K.
The resting potential in neurons requires: a. membrane transport channels to be constantly open for $\mathrm{Na}^{+}$ and $\mathrm{K}^{+}$ flow. b. the inside of neurons to be positive relative to the outside. c. the diffusion of $\mathrm{K}^{+}$ out of the cell and a charge difference between the inside and outside of the axon set up by this movement of $\mathrm{K}^{+}$ d. an active $\mathrm{Na}^{+} / \mathrm{K}^{4}$ pump, which pumps $\mathrm{Na}^{+}$ and $\mathrm{K}^{+}$ into the neuron. three $\mathrm{Na}^{+}$ ions to be pumped through three $\mathrm{Na}^{+}$ gates and two $\mathrm{K}^{+}$ ions to be pumped through two $\mathrm{K}^{+}$ gates.
Recommended Textbooks
Computer Science and Information Technology
Introduction to Programming Using Python
Computer Science - An Overview
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD