(a)
To determine: Whether the “Influx of
Introduction: Signal transduction in neurons depends upon the resting potential of the membrane of the neuron. Signals are sent by a wave of depolarization. This wave of polarization develops only when depolarization potential is more than the threshold potential. This potential is termed as action potential of the membrane.
(b)
To determine: Whether the “
Introduction: Signal transduction in neurons depends upon the resting potential of the membrane of the neuron. Signals are sent by a wave of depolarization. This wave of polarization develops only when depolarization potential is more than the threshold potential. This potential is termed as action potential of the membrane.
(c)
To determine: Whether the “
Introduction: Signal transduction in neurons depends upon the resting potential of the membrane of the neuron. Signals are sent by a wave of depolarization. This wave of polarization develops only when depolarization potential is more than the threshold potential. This potential is termed as action potential of the membrane
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Biology (MindTap Course List)
- excitatory and 15 inhibitory postsynaptic potentials appear simultaneously on the plasmatic membrane of motoneuron. Answer the question A and fulfill the task B:A) Will this neuron generate the efferent nervous impulses if the amplitude of single EPSP and IPSP appeared on the axonal hillock`s membrane equals 1 mV? Why?B) Name the state of this neuron and name the type of summationarrow_forwardThe membrane potential labeled (0) is due to which of the following (when compared to (3) potential. (A) voltage-gated Na+ channels (B) voltage-gated K+ channels (C) voltage-gated slow Ca++ channels (D) voltage-gated fast Ca++ channels (E) voltage-gated transient Ca++ channels (F) funny channelsarrow_forwardGive typed explanationarrow_forward
- In the figure to the left, name the 4 phases of the action potential (Note: you have to write in where phase 4 occurs). Describe what happens in each phase with a focus on Na+ and K+ flow through channels and the membrane potential. Discuss the importance of threshold. How does this relate to the concept of APs being all or none?arrow_forwardBased upon the changes in permeability seen in the trace below and your knowledge of ion distributions across a cell, predict how ion movements would change during an action potential. Drag and drop each phrase into the appropriate box on the action potential trace. Drag the appropriate labels to their respective targets. Note: not all labels will be used. ►View Available Hint(s) Sodium (Na+) ions move to the axon Sodium (Na) ions move out of the axon Less potassium (K) ions move out of the axon Potassium (K) ions move out of the axon Potassium (K¹) ions move into the axon Sodium (Na) ions stop moving in Membrane potential (mv) +30 +10 0 -10- -30 -50 -70 -90 A PNa 0 PNa 5 6 1 PK Threshold PK 2 Reset Helparrow_forwardDescribe in detail the function for three type of potentials seen in neurons and describe in detail the three types of potentials seen in neurons?arrow_forward
- The membrane potential labeled (4) is due to which of the following? (A) voltage-gated Na+ channels (B) voltage-gated K+ channels (C) voltage-gated slow Ca++ channels (D) voltage-gated fast Ca++ channels (E) voltage-gated transient Ca++ channels (F) funny channelsarrow_forwardPredict the effect of the poison ouabain (way-BAH-in), which blocks Na+/K+ pumps, on the neuronal action potential. (Hint: What would happen to the sodium and potassium ion gradients?)arrow_forwardIf the membrane permeability for Nat were suddenly increased in an excitable cell: (select all that apply)arrow_forward
- What happens when a resting neuron’s membranedepolarizes?(A) There is a net diffusion of Na+out of the cell.(B) The equilibrium potential for K+(EK) becomesmore positive.(C) The neuron’s membrane voltage becomesmore positive.(D) The cell’s inside is more negative than the outsidearrow_forwardVirtually all vertebrate cells, whether excitable or not, have a resting membrane potential (RMP). please choose the right answer fro C1 C2 C3 and C4 C. Suppose you add enough KCl to increase the [K+] in the ECF from the usual value (3 mM) to 4.5 mM. What should happen to a neuron? C-1. You expect the RMP to become (+ or more +) (- or more -) (less -) (less +) (go to, or stay at, zero) (stay at the normal nonzero value). C-2. You expect the total number of K+ ions inside the cell to (increase) (decrease) (stay about the same). C-3. You expect the net [K+] inside the cell -- in mM -- to (increase significantly) (decrease significantly) (stay about the same). C-4. Suppose the neuron under consideration gets input from many different synapses. You increase the [K+] in the ECF as above. Given your answer to part C-1, the neuron should be (more likely) (less likely) (about equally likely) to fire an action potential. No explanation required on the exam, but it helps to see how you…arrow_forwardGive a detailed, step-by-step description of the stages of an action potential, including a description of and explanation for the refractory periods and the rising and falling phases as well as return to rest. In your explanation, make sure to include 1) summation principles, 2) key membrane potentials (values), 3) location of voltage changes along the membrane, 4) states of the various voltage-gated channels. The more detail, the better. There are 5 main steps.arrow_forward
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning