Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 48, Problem 7IQ
Summary Introduction
To describe: The reasons due to which acetylcholine has opposite effects for skeletal muscle contraction and cardiac muscle contraction.
Introduction: Acetylcholine is a common neurotransmitter in invertebrates as well as vertebrates. It is released by the motor neurons of the nervous system at the neuromuscular junction. A junction between a neural cell and a muscle cell that is stimulated due to the release of acetylcholine is termed as a neuromuscular junction.
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Acetylcholine is a common neurotransmitter released at the synapse. Predict the consequences for muscle activation of decreased acetylcholine esterase activity at nerve-muscle synapses.
When the neurotransmitter acetylcholine (ACh) binds the acetylcholine receptor (a GPCR) on muscle cells, it causes them to contract. ZIGGY, a chemical analog of ACh, also binds to the same acetylcholine receptor on muscle cells, but instead causes the muscle cells to relax. For this reason, it is sometimes prescribed as a muscle relaxer. Explain in 3-4 sentences how ZIGGY could cause muscle relaxation.
How can both ZIGGY and ACh bind the same GPCR? And then how can they have different effects on the cells, despite binding to the same receptor on the same cells?
The effects of neurotransmitter binding are very brief. Explain.
Chapter 48 Solutions
Study Guide for Campbell Biology
Ch. 48 - Prob. 1IQCh. 48 - a. What is the principal cation inside the cell?...Ch. 48 - The following diagram shows the changes in...Ch. 48 - Prob. 4IQCh. 48 - Prob. 5IQCh. 48 - Prob. 6IQCh. 48 - Prob. 7IQCh. 48 - Develop a flowchart or diagram or write a...Ch. 48 - Prob. 1TYKCh. 48 - Prob. 2TYK
Ch. 48 - During a neurons resting state a. there are more...Ch. 48 - Which of the following contribute(s) to the...Ch. 48 - Prob. 5TYKCh. 48 - Prob. 6TYKCh. 48 - Prob. 7TYKCh. 48 - After the rapid depolarization of an action...Ch. 48 - Nodes of Ranvier are a. gaps where Schwann cells...Ch. 48 - Prob. 10TYKCh. 48 - Signal transmission is faster in myelinated axons...Ch. 48 - Which of the following statements concerning...Ch. 48 - Prob. 13TYKCh. 48 - Prob. 14TYKCh. 48 - Prob. 15TYKCh. 48 - Prob. 16TYKCh. 48 - Prob. 17TYKCh. 48 - If the binding of a neurotransmitter to its...
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- Neurotransmitters are chemicals located and released in the brain to allow an impulse from one nerve cell to pass to another nerve cell. Explain any five neurotransmitters with detailed information.arrow_forwardCaffeine prolongs the life span of acetylcholine molecules in the motor junctions. Explain how this fact is related to caffeine’s tendency to cause jitters, such as hand tremors and other small involuntary contractions.arrow_forwardGive two mechanisms by which neurotransmitters exert their effects.arrow_forward
- Long-term aerobic training has been shown to alter the balance of sympathetic and parasympathetic activity. These changes include increased stroke volume and reduced resting heart rate. Explain how the enhanced parasympathetic activity would result in these adaptations.arrow_forward"Motor neurons trigger action potentials in muscle cell membranes that open voltage-sensitive Ca2+ channels in T tubules, allowing extracellular Ca2+ to enter the cytosol, bind to troponin C, and initiate rapid muscle contraction", is true or false.arrow_forwardDescribe the neurotransmitters shown in Section 11.14 in the selected neurotransmitters table. Give examples of how they might occur in the body.arrow_forward
- A chemical synapse is a type of synapse that occurs between two neurons and between a motor neuron and skeletal muscle fibers (i.e. at a Neuromuscular junction, NMJ). Compare and contrast the specific events that occur at chemical synapses at these two sites. Describe clearly how they are similar and how they are different, starting at the arrival of a nerve impulse at the pre-synaptic neuron and ending up with the changes observed at the postsynaptic membranes.arrow_forwardCatecholamines are neurotransmitters that are produced in the adrenal glands and are released during a stress response. Some typical effects are increased heart rate, increased blood glucose levels and elevated blood pressure. Examples include dopamine, norepinephrine, and epinephrine. Reserpine is a drug that can control high blood pressure by reducing the number of catecholamine neurotransmitters present in the synapse. Which of the following rows correctly identifies the effect of reserpine in the synapse and the division of the nervous system it affects? Select one: а. Effect in the Synapse Division of the Nervous System Keeps catecholamines longer in the synapse Sympathetic nervous system b. Effect in the Synapse Division of the Nervous System Inhibits release of catecholamines from the presynaptic neuron Sympathetic nervous system С. Effect in the Synapse Division of the Nervous System Inhibits release of catecholamines from presynaptic neuron Parasympathetic nervous system d.…arrow_forwardExplain in detail Muscarinic receptors in regards to the hisamine agonist. How do they cause smooth muscle contraction. Provide mechanismarrow_forward
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