Use the following information to answer the next question:In a classic experiment, the strength of a neural stimulus and the resulting musclecontraction are compared. A single motor neuron that sends a message to a musclefibre is suspended. One end is attached to the muscle fibre, and the free end of themuscle fibre is attached to a mass. If an electrical stimulus is sufficient to cause animpulse in the neuron, the muscle will contract and lift the mass. The following datawere obtained from the experiment.Strength of Stimulus (mV)Mass Lifted by Muscle (g)12103104Analyze the data and answer the following questions:1. a.Define threshold potential and illustrate your definition with a specificexample. What is the minimum stimulus required to reach the thresholdpotential for this neuron?Answer:Explain the all-or-none response. Predict the mass that could be lifted at4 mV of stimuli. Explain your answer.b.Answer:Choose a specific example of a sensory receptor, and explain the neural stimulationand impulses for that sensory pathway in terms of the threshold potential and theall-or-none response.С.Answer:

Neurons are the basic building blocks of the nervous system.

Answered: In a classic experiment, the strength…

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

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter8: Muscle Physiology

Section: Chapter Questions

Problem 2TAHL

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Similar questions

In the diagram below, label the fine structure of a muscle, down to one of its myofibrils. Identify the basic unit of contraction in a myofibril.
Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.
Skeletal muscle is described as striated. What are the lighter, thinner stripes noted under the microscope? Group of answer choices troponin actin myosin dystrophin Rather than innervating individual muscle fibers, motor neurons often innervate two or more muscle fibers. The motor neuron and the muscle fibers it innervates are together called a: Group of answer choices motor unit myofibril muscle fascicle motor fascia Fast glycolytic muscle fibers allow for relatively quick ATP energy production by splitting glucose (but eventually leads to fatigue), a process described as: Group of answer choices fermentation aerobic pathway anaerobic pathway ATP reserve use
Given what you have learned from the first experiment, you prepare the other leg for a fresh experiment. When you add acetylcholine to the preparation, the muscle contracts. You add curare, and again add acetylcholine to the preparation, and the muscle does not contract. Based on these data, and the data from the first experiment, this means curare is potentially acting on: Both the alpha motor neurons' ability to conduct action potentials, and the muscle's ability to conduct action potentials, but not on the neuromuscular junction. O Both the alpha motor neurons' ability to conduct action potentials, and the neuromuscular junction, but not the muscle's ability to conduct action potentials. O Both the neuromuscular junction and the muscle's ability to conduct action potentials, but not on the alpha motor neurons' ability to conduct action potentials. O It must only be affecting the muscle's ability to conduct action potentials. O It must only be affecting the neuromuscular junction. O…
Distinguish between skeletal, smooth, and cardiac muscle in terms of location and whether they have sarcomeres. Use the sliding filament model to draw how thin filaments, thick filaments, and Z lines move during muscle contraction. Predict how perturbations of acetylcholine release, reception, or breakdown will influence muscle contraction. Predict how perturbations of actin, troponin, tropomyosin, myosin, or calcium would influence muscle contraction. Distinguish between the sympathetic and parasympathetic nervous system. Predict how changes in stress levels or situations would affect activation of the sympathetic and parasympathetic nervous system, levels of epinephrine and norepinephrine, and blood pressure.
In what ways does the neural control of smooth muscle activity differ from that of skeletal muscle? Describe how a stimulus may lead to the contraction of a smooth muscle cell without a change in the plasma membrane potential. Describe the differences between single-unit and multiunit smooth muscles. cite your references
What are the two types of muscle movement categories? Give an example for both. Describe Swammerdam's experiment and Galvani's experiment with frog legs. What did they tell us about muscle contraction? . What is the sliding-filament model for muscle contraction? Describe the role of actin and myosin of sarcomeres in the model (be specific). 4. Describe how an action potential triggers muscle contraction. Know the specific molecules involved. 5. Describe the structural and functional differences between smooth, cardiac and skeletal muscles. What are the three types of skeletal muscle fibers and how do they differ in structure and function? Next « Previous MacBook Pro
Describe in details the biochemical and mechanochemical series of events that enables motor neurons to trigger muscle contraction, using the biceps brachii as an example.
In an isometric contraction, how can the muscle stay the same length when the muscle is contracting? Can choose more than one - The muscle is not able to generate more (or the same amount) force than the load, preventing shortening of the muscle. - Calcium stops entering the sarcoplasm when the desired length is reached. - Elastic elements of the muscle stretch in response to the contraction of the muscle, so that the muscle stays the same size despite shortening sarcomeres. - The myosin heads detach from actin when they reach the desired length.
When an action potential from a motor neuron arrives at the neuromuscular junction, a series of events occurs that leads to muscle contraction. Arrange following events in the correct order from first to last.
In the process of muscle contraction, which of the following steps immediately comes after the propagation of an action potential down the t-tubules of a myofiber? sliding of tropomyosin causing exposure of actin binding of myosin head to actin's active site release of calcium from the terminal cisternae binding of acetylcholine to its receptor influx of sodium at the sarcolemma
Match the following types of contractions: The stimulus above which no stronger contraction can be elicited, because all motor units are firing in the muscle Determined by alternating motor units of a muscle organ even when the muscle is at rest Continued sustained smooth contraction due to rapid stimulation The situation in which contractions become stronger due to stimulation before complete relaxation occurs How a smooth increase in muscle force is produced [Choose] [Choose ] [Choose] [Choose] [Choose]

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