6. If the action potentials shown in the diagram below occur sequentially and in close temporalproximity, what will be the final result in cell D? In this notation,< indicates an excitatoryan inhibitory synapse. Focus on overall effects – excitation andinhibition – don't worry about quantifying responses here. (Hint: you may want to identify what ishappening at each cell and then how that will be affected by the activation of the previous cell)synapse and indicatesAboveAbovethresholdstimulationAbovethresholdstimulationthresholdstimulationD

Threshold of Stimulation can be defined as the physiology of nerve and muscle cells, the minimum…

Answered: 6. If the action potentials shown in…

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter4: Principles Of Neural And Hormonal Communication

Section: Chapter Questions

Problem 2SQE

See similar textbooks

Similar questions

Which of the following statements best describes saltatory conduction? a. It inhibits direct neurotransmitter release. b. It transmits the action potential at the nodes of Ranvier andthus speeds up impulses on myelinated axons. c. It increases neurotransmitter release at the presynapticmembrane. d. It decreases neurotransmitter uptake at chemically gatedpostsynaptic channels. e. It removes neurotransmitters from the synaptic cleft.
Which of the following does not contribute to propagation of action potentials? a. As the area outside the membrane becomes negative, itattracts ions from adjacent regions; as the inside of the membrane becomes positive, it attracts negative ions from nearby in the cytoplasm. These events depolarize nearby regions of the axon membrane. b. The refractory period allows the impulse to travel in only one direction. c. Each segment of the axon prevents the adjacent segments from firing. d. The magnitude of the action potential stays the same as it travels down the axon. e. Up to a limit, increasing the intensity of the stimulus increases the number of action potentials.
The major role of the Na+/K+ pump is to: a. cause a rapid firing of the action potential so the inside of themembrane becomes momentarily positive. b. decrease the resting membrane potential to zero. c. hyperpolarize the membrane above resting value. d. cause an action potential to enter a refractory period. e. maintain the resting membrane potential at a constantnegative value.
An example of a synapse could be the site where: a. neurotransmitters released by an axon travel across a gap and are picked up by receptors on a muscle cell. b. an electrical impulse arrives at the end of a dendrite causingions to flow onto axons of presynaptic neurons. c. postsynaptic neurons transmit a signal across a cleft to apresynaptic neuron. d. oligodendrocytes contact the dendrites of an afferent neurondirectly. e. an onoff switch stimulates an electrical impulse in apresynaptic cell to stimulate other presynaptic cells.
In the propagation of a nerve impulse: a. the refractory period begins as the K+ channel opens, allowing K+ ions to flow outward along their concentrationgradient. b. Na+ ions flow out of the axon with their concentration gradient. c. positive charges lower the membrane potential to its lowestaction potential. d. gated K+ channels open at the same time as the activationgate of Na+ channels closes. e. the depolarizing stimulus lowers the membrane potential toopen the Na+ gates.
View the University of Michigan Webscope (http://openstaxcollege.org/l/nervefiber) to see an electron micrograph of a cross-section of a myelinated nerve fiber. The axon contains microtubules and neurofilaments, bounded by a plasma membrane known as the axolemma. Outside the plasma membrane of the axon is the myelin sheath, which is composed of the tightly wrapped plasma membrane of a Schwann cell. What aspects of the cells in this image react with the stain that makes them the deep, dark, black color, such as the multiple layers that are the myelin sheath?
Figure 35.11 Potassium channel blockers, such as amiodarone and procainamide, which are used to treat abnormal electrical activity in the heart, called cardiac dysrhythmia, impede the movement of K+ through voltage-gated K+ channels. Which part of the action potential would you expect potassium channels to affect?
For a neuron to fire an action potential, its membrane must reach. hyperpolarization the threshold of excitation the refractory period inhibitory postsynaptic potential
An action potential begins when ___ . a. a neuron reaches threshold potential b. voltage-gated potassium gates open c. voltage-gated .sodium gates dose d. sodium-potassium pumps stop operating
Neurons contain ________, which can receive signals from other neurons. a. axons b. mitochondria c. dendrites d. Golgibodies
Watch this video (http://openstaxcollege.org/l/summation) to learn about summation. The process of converting electrical signals to chemical signals and back requires subtle changes that can result in transient increases or decreases in membrane voltage. To cause a lasting change in the target cell, multiple signals are usually added together, or summated. Does spatial summation have to happen all at once, or can the separate signals arrive on the postsynaptic neuron at slightly different times? Explain your answer.
1.) In an experiment you artificially cut in half (~50% reduction) the number of voltage gated sodium channels that are located on the membrane of the axon hillock. Which of the following is the most likely result of this experimental manipulation? A. Summation of more IPSPs would be required for an action potential to occur B. This change would have no effect on the value required to reach threshold C. Even with a very large number of summating EPSPs it would be impossible for an action potential to occur D. The value to reach threshold would be higher (more positive) making it less likely for an action potential to occur E. All of the above statements are FALSE

SEE MORE QUESTIONS

Recommended textbooks for you

Human Physiology: From Cells to Systems (MindTap …

Biology

ISBN:

9781285866932

Author:

Lauralee Sherwood

Publisher:

Cengage Learning

Biology 2e

Biology

ISBN:

9781947172517

Author:

Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:

OpenStax

Biology: The Dynamic Science (MindTap Course List)

Biology

ISBN:

9781305389892

Author:

Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:

Cengage Learning

Human Physiology: From Cells to Systems (MindTap …

Biology

ISBN:

9781285866932

Author:

Lauralee Sherwood

Publisher:

Cengage Learning

Biology 2e

Biology

ISBN:

9781947172517

Author:

Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:

OpenStax

Biology: The Dynamic Science (MindTap Course List)

Biology

ISBN:

9781305389892

Author:

Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:

Cengage Learning

Biology: The Unity and Diversity of Life (MindTap…

Biology

ISBN:

9781337408332

Author:

Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:

Cengage Learning

Cardiopulmonary Anatomy & Physiology

Biology

ISBN:

9781337794909

Author:

Des Jardins, Terry.

Publisher:

Cengage Learning,

Anatomy & Physiology

Biology

ISBN:

9781938168130

Author:

Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:

OpenStax College

SEE MORE TEXTBOOKS