WHAT IS LIFE? GDE.TO BIO.W/PHYS.-ACCESS
WHAT IS LIFE? GDE.TO BIO.W/PHYS.-ACCESS
5th Edition
ISBN: 9781319360719
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 24, Problem 4MC
Summary Introduction

Introduction:

Dendrites act as the signal receptors of the neurons.

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Please note these are all one question group and should be answered as such!   Which of the following statements accurately defines epineurium?   A. Fluid-filled space at a synapse through which neurotransmitters diffuse   B. A vesicle containing neurotransmitters in the axon terminal of a neuron   C. The CT sheath that binds together the groups of fascicles, blood vessels, and lymphatic vessels in a peripheral nerve   D. The branch of the ANS that adapts the body for rest and digestion Which of the following statements accurately defines sacral plexus?   A. The ventral rami of C1–C4 (and a small contribution from C5) that serve the head and neck   B. The ventral rami of L1–L4 that serve the pelvis and lower limb   C. The ventral rami of C5–T1 that serve the upper limb   D. The ventral rami of L4–S4 that serve the pelvis and lower limb
A stimulus causes a change in permeability of neural membranes, which begins the process of transmitting an impulse. If the stimulus reaches the threshold potential of a neuron, an action potential is generated. Select the numbers of the statements below that occur once the threshold potential is reached. 1. Sodium ions flow into the neuron. 2. Sodium ions flow out of the neuron. 3. The membrane potential becomes positive. 4. The membrane potential becomes negative. 5. Voltage-gated potassium channels open. 6. Voltage-gated potassium channels close. 7. Potassium ions flow into the neuron. 8. Potassium ions flow out of the neuron. Place the numbers in order from the first event to the last event: and
Which of the following is true about the conduction of action potentials?  a. Thicker axons are faster because there is more surface area on thicker axons. b. Myelin speeds conduction because the glial cells add voltage gated Na+ channels to the neuron. c. Diffusion of Na+ ions between the Nodes of Ranvier happens faster than the wave of opening and closing membrane proteins can travel. d. Neurons that don’t have myelin sheaths undergo saltatory conduction e. Action potentials move slowly.
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