Biology: Concepts and Investigations
5th Edition
ISBN: 9781260259049
Author: Hoefnagels
Publisher: MCG
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Chapter 26, Problem 5MCQ
Summary Introduction
Introduction:
The specialized junction for the communication of axon of one neuron to another is known as synapse. There are three components of the synapse: presynaptic cell, post synaptic cell and the synaptic cleft. Presynaptic cell is the neuron that sends the impulse, postsynaptic cell is the neuron that receives the impulse and the space between these two neurons is known as synaptic cleft.
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Any change in a neuron's membrane potential that moves the membrane potential to a value more negative than the resting potential (e.g. -120mv) is:
a. Hypopolarization
b. Depolarization
c. An action potential
d. HyperpolarizationNOTE: A IS INCORRECT
Postsynaptic potential’s are graded potential’s that develop in the postsynaptic membrane. If the release of a neurotransmitter at a post synaptic membrane leads to hyper polarization, this event is referred to as A. EPSP B. ISIP C. Summation D. Facilitation
Postsynaptic potentials are graded potentials that develop in the postsynaptic membrane. Which one of the following statements accurately describes what causes EPSP's to occur at the postsynaptic membrane?
Group of answer choices
A.an EPSP results from the opening of voltage gated sodium channels
B.an EPSP results from the opening of chemically gated sodium channels
C.an EPSP results from the opening of voltage gated potassium channels
D.an EPSP results from the opening of chemically gated potassium channels
Chapter 26 Solutions
Biology: Concepts and Investigations
Ch. 26.1 - Prob. 1MCCh. 26.1 - Prob. 2MCCh. 26.1 - Prob. 3MCCh. 26.2 - Prob. 1MCCh. 26.2 - Where is the myelin sheath located?Ch. 26.2 - Prob. 3MCCh. 26.2 - What are the functions of each of the three...Ch. 26.3 - Describe the forces that maintain the distribution...Ch. 26.3 - Prob. 2MCCh. 26.3 - Prob. 3MC
Ch. 26.3 - Prob. 4MCCh. 26.3 - What prevents action potentials from spreading in...Ch. 26.3 - Prob. 6MCCh. 26.3 - How do myelin and the nodes of Ranvier speed...Ch. 26.4 - Describe the structure of a synapse.Ch. 26.4 - Prob. 2MCCh. 26.4 - Prob. 3MCCh. 26.4 - Prob. 4MCCh. 26.5 - Prob. 1MCCh. 26.5 - Prob. 2MCCh. 26.5 - Prob. 3MCCh. 26.5 - Prob. 4MCCh. 26.6 - Prob. 1MCCh. 26.6 - Prob. 2MCCh. 26.6 - Prob. 3MCCh. 26.6 - List some structures that protect the central...Ch. 26.6 - Prob. 5MCCh. 26.7 - The researchers conducted a behavioral experiment...Ch. 26.7 - Prob. 2MCCh. 26 - Some cells of the central nervous system are...Ch. 26 - Prob. 2MCQCh. 26 - What event triggers an action potential? a....Ch. 26 - Prob. 4MCQCh. 26 - Prob. 5MCQCh. 26 - Prob. 6MCQCh. 26 - Prob. 7MCQCh. 26 - Damage to the surface tissue of the spinal cord...Ch. 26 - Prob. 9MCQCh. 26 - Describe some invertebrate nervous systems. Why do...Ch. 26 - Prob. 2WIOCh. 26 - Prob. 3WIOCh. 26 - Prob. 4WIOCh. 26 - What is the connection between the threshold...Ch. 26 - Write a nonbiological analogy for resting...Ch. 26 - Prob. 7WIOCh. 26 - Sketch a synapse: label the axon and synaptic...Ch. 26 - Describe the events that occur at a synapse when a...Ch. 26 - Prob. 10WIOCh. 26 - Prob. 11WIOCh. 26 - Cerebral palsy is a nervous system disorder that...Ch. 26 - Traumatic brain injury can occur when a person...Ch. 26 - Prob. 14WIOCh. 26 - Prob. 15WIOCh. 26 - Prob. 16WIOCh. 26 - Prob. 1PITCh. 26 - Prob. 2PITCh. 26 - PULL IT TOGETHER 4. Acid the somatic, autonomic,...
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- Which of the following statements does NOT correctly describe the repolarization of a neuron? a. The potassium channels are slower to open, allowing the potassium ions to leave after depolarization. b. The potassium ions leave the cell, thereby returning the neuron to its resting potential. c. The neuron becomes more polarized and more negatively charged than its original resting membrane potential. d. The sodium and potassium channels open, allowing the positive ions to move out of the cell.arrow_forwardA synapse includes: a. a very narrow synaptic cleft b. a presynaptic neuron with neurotransmitter receptor sites on its membrane c. a postsynaptic neuron that releases the neurotransmitter d. all of the above The upper abdominopelvic regions include the: a. right and left iliac and epigastric b. right and left lumbar and umbilical c. right and left hypochondriac and epigastric d. right and left hypochondriac and umbilical A decrease in insulin production: a. usually causes type I diabetes mellitus b. will stimulate the release of growth hormone c. is usually the cause of type II diabetes mellitus d. both a and c abovearrow_forwardWhich of the following examples of synaptic integration is most likelyto lead to an action potential in a postsynaptic cell?a. All excitatory and no inhibitory synaptic inputsb. An equal mix of excitatory and inhibitory inputsc. A majority of inhibitory inputs with only a few excitatory inputsd. Both a and b are correct.arrow_forward
- Which of the following is not a structural component of a chemical synapse? A. Presynaptic Knob B. Synaptic Cleft C. Postsynaptic Membrane D. All of the above.arrow_forwardIf a post synaptic neuron is stimulated to threshold by spatial summation this implies that Select one: a. the post synaptic cell has many voltage gated ion channels b. the post synaptic cell has a lower than normal threshold c. the post synaptic cell is slow to repolarize d. the post synaptic cell is synapsing with multiple presynaptic neuronsarrow_forwardA channel opens on a postsynaptic membrane that causes a negative ion to leave the cell. What type of graded potential is this? a. depolarizing b. repolarizing c. hyperpolarizing d. non-polarizingarrow_forward
- Match the description with the statement that best describes the following neural circuits. a single post-synaptic neuron receives input from multiple pre- synaptic neurons causes the stimulation of the post-synaptic neuron continually similar to a positive feedback response A. diverging circuits B. converging circuits C. reverberating circuits causes a longer lasting stimulus of the post-synaptic neuron D. parallel after discharge circuits a single pre-synaptic neuron synapses with multiple post-synaptic neurons Moving to another question will save this response. Photos A39 DEC 3 17 étvarrow_forwardWhat are all the possible ways that a neurotransmitter is removed from the synaptic cleft? Select all that apply. A. Taken up by postsynaptic transporters B. Taken up by presynaptic transporters C. Broken down by enzymes in the cleft D. Broken down by enzymes in the presynaptic side E. Broken down by postsynaptic enzymesarrow_forwardAt an electrical synapse, presynaptic and postsynaptic membranes interface through a. neurofibril nodes. b. gap junctions. c. telodendria. d. neurotransmitters.arrow_forward
- Which of the following best describes the electrical state of a neuron at rest? a. The inside of a neuron is more negatively charged than the outside. b. The outside of a neuron is more negatively charged than the inside. c. The inside and the outside of a neuron have the same electrical charge. d. Potassium ions leak into a neuron at rest.arrow_forwardIf a post synaptic neuron is stimulated to threshold by spatial summation this implies that Select one: a. the post synaptic cell has many voltage gated ion channels b. the post synaptic cell has a lower than normal threshold OC. the post synaptic cell is slow to repolarize d. the post synaptic cell is synapsing with multiple presynaptic neuronsarrow_forwardPostsynaptic potential’s are graded potential’s that develop in the postsynaptic membrane. If the release of a neurotransmitter at a post synaptic membrane leads to hyper polarization, this event is referred to as A. EPSP B. ISIP C. Summation D. Facilitation An individual EPSP usually only produces a slight depolarization of the postsynaptic membrane. If multiple stimuli arrive in rapid succession at a single synapse, this can lead to the generation of an action potential. This mode of generating action potentials is referred to as A. Spatial summation B. Facilitation c. Temporal summation D. Inhibition arrow_forward
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