Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Textbook Question
Chapter 32, Problem 3SQ
Action potentials occur when ________
- a. a neuron receives adequate stimulation
- b. more and more sodium gates open
- c. sodium-potassium pumps kick into action
- d. both a and b
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Which one of these is an example of an excitatory postynaptic potential in a typical neuron?
a) A voltage change from -70mV to -70.5mV
b) A voltage change from +35mV to 0MV
c) A voltage change from 0mV to +0.35mV
d) A voltage change from -69.5mV to -70mV
Neurotransmitters are released by_____ . a. axon terminals c. dendrites b. a neuron cell body d. glial cells
Most human axons have a myelin sheath that_____ . a. prevents action potentials from moving backward b. increases the speed of action potential conduction c. consists of specialized interneurons d. increases the size of action potentials
Chapter 32 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 32 - ___ relay messages from the brain and .spinal cord...Ch. 32 - Prob. 1DAACh. 32 - Prob. 2DAACh. 32 - Prob. 3DAACh. 32 - Prob. 4DAACh. 32 - When a neuron is at rest, ______ a. it is at...Ch. 32 - Action potentials occur when ________ a. a neuron...Ch. 32 - True or false? Action potentials vary in their...Ch. 32 - Neurotransmitters are released by _______ a. axon...Ch. 32 - What chemicals is released by the axon terminals...
Ch. 32 - Which neurotransmitter is important in...Ch. 32 - Skeletal muscles are controlled by _________ a....Ch. 32 - When you sit quietly on the couch and read, output...Ch. 32 - Dorsal root ganglia contain _______ of sensory...Ch. 32 - Prob. 11SQCh. 32 - Neurons are arrested in ________ of the cell...Ch. 32 - Prob. 13SQCh. 32 - Commands to move your right arm start in the...Ch. 32 - Match each item with its description. ___ gray...Ch. 32 - Prob. 1CTCh. 32 - In human newborns, especially premature ones, the...
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- Post synaptic neurons membrane potentials are less negative than resting membrane potentials when this occur A. Creates a new set point for the resting membrane potential B. Has a lower propensity to produce an action potential C. Reacts by generating action potential D. Higher chance of reaching the potential thresholdarrow_forwardThe integrative functions of the nervous system are performed mainly bya. afferent neurons.b. efferent neurons.c. neuroglia.d. sensory neurons.e. interneurons.arrow_forwardNeurotransmitters must pass from an axon terminal to the next dendrite by crossing a fluid-filled space called the a. synapse. c. neuron. b. reuptake inhibitor. d. glial cell.arrow_forward
- Neurons come in which different type(s)? A. Sensory B. Motor C. Skeletal D. A and Barrow_forwardWhen a neuron is at rest,_____ . a. it is at threshold potential b. voltage-gated sodium channels are open c. sodium–potassium pumps are operating d. it contains more sodium ions than the surrounding interstitial fluidarrow_forwardAction potentials occur when ______. a. potassium gates close b. a stimulus pushes membrane potential to threshold c. sodium-potassium pumps become active d. neurotransmitter is reabsorbedarrow_forward
- Consider the image. The neuron labeled number _____ in the figure is a motor neuron; its function is _____. A)2; stimulating muscles or glands B)3; stimulating muscles or glands C)1; connecting different types of neurons D)3; connecting different types of neuronsarrow_forwardDuring saltatory conduction, action potentials are generated: a. along the entire length of the unmyelinated axon. b. regardless if threshold is reached. c. when the entire axolemma is depolarized. d. only at nodes of Ranvier of myelinated axons.arrow_forwardDuring the refractory period a) if a neuron reaches threshold the action potential goes to completion b) No stimulus of any strength will trigger a new action potential c) It is possible to trigger a new action potential but only with an unusually strong stimulus d) The signal grows weaker with distance e) The neuron fires at its maximum voltage if a stimulus depolarizes the neuron to thresholdarrow_forward
- Somatic motor neurons have axons the conduct signals from the CNS to _ ; and are usually under _ control. a. Skeletal muscle; involuntary b. Hollow organs; voluntary c. Hollow organs; involuntary d. Skeletal muscle; voluntaryarrow_forwardNerve membrane hyperpolarization after an action potential a)Is the movement of membrane potential voltage below normal resting potential voltage. b) This Is mostly due to the slow-closing of K+ channels. c)Makes it more difficult to evoke another action potential. d) This Is mostly due to the slow-closing of Na+ channels.arrow_forwardCompared to sparrows, neurons in larger dinosaurs would probably have ______________ myelin and be ____________ than sparrow neurons. A) less, wider B) less, narrower C) more, wider D) more, narrowerarrow_forward
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