The EMG is a recording of: * The action potentials of the motor nerves supplying the muscle fibers. The action potentials of the innervated muscle fibers. The contractions of the innervated muscle fibers O The action potential of the pacemaker cells O The electrical activity in the sarcoplasmic reticulum

The EMG is a recording of: * The action potentials of the motor nerves supplying the muscle fibers. The action potentials of the innervated muscle fibers. The contractions of the innervated muscle fibers O The action potential of the pacemaker cells O The electrical activity in the sarcoplasmic reticulum

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter32: Structural Support And Movement

Section: Chapter Questions

Problem 12SA

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Cheetahs and human sprinters tend to have a high proportion of ________fibers in their leg muscles. a. white b. fast red c. slow red
Skeletal muscle contraction requires _________. a. calcium ions b. ATP c. arrival of a nerve impulse d. all of the above
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.
Depolarization of the sarcolemma means ________. the inside of the membrane has become Less negative as sodium ions accumulate the outside of the membrane has become less negative as sodium ions accumulate the inside of the membrane has become more negative as sodium ions accumulate the sarcolemma has completely lost any electrical charge
When compared to normal muscle, the response of the denervated muscle to electrical stimulation shows :-a- decreased chronaxieb- greater response to faradic stimulationc- abnormal response to galvanic stimulationd- CCC becomes greater than ACC
The muscle relaxes if no new nerve signal arrives. However the neurotransmitter from the previous stimulation is still present in the synapse. The activity of ________ helps to remove this neurotransmitter. a. myosin b. action potential c. tropomyosin d. acetylcholinesterase
Increased sensory discharge from muscle spindles :-a- decreases muscle toneb- increases muscle tonec- could either increase or decrease muscle tone according to the muscle affectedd- has no effect on muscle tone
As an action potential moves along the sarcolemma, the brief opening of voltage-gated Na+ channels will allow Na+ to rush into the muscle cell, causing the inside of the membrane at that location to become more ________. positive negative
When a skeletal muscle is suddenly stretched :-a- it relaxes suddenlyb- it develops a static stretch reflexc- it develops a dynamic stretch reflexd- it develops clonic contractions
A research scientist is developing a new drug that blocks muscle cellreceptors that, when activated, stimulate a muscle contraction. In her firstexperiment, she used 250 mg of the new drug but saw no effect. In hersecond experiment, she increased the dosage to 750 mg. This dosagewas successful in blocking the muscle stimulation. Explain why increasingthe dosage would affect the outcome of the experiment.
The figure below shows the muscle tension (Y axis) following the application of stimuli to the muscle fiber. The pink arrows on the bottom symbolize stimuli to the muscle cell. The best explanation that the tension of the contraction in panel 4 is larger than other panels is because: A. More motor units are recruited B. More muscles are contracting C. The duration of the stimuli is longer D. The frequency of the stimuli is greater
After nervous stimulation stops, what prevents acetylcholine in the synaptic cleft from continuing to stimulate contraction?" calcium ions returning to the terminal cisternae the tropomyosin blocking the myosin once full contraction is achieved acetylcholinesterase destroying the acetylcholine During the repolarization phase of an action potential a small region of the inner surface of a muscle cell's membrane becomes more _________. negative as potassium diffuses into the cell positive as potassium diffuses into the cell negative a potassium diffuses out of the cell positive as sodium diffuses out of the cell A electrical impulse travels deep into the muscle fiber along the sarcolemma T-tubule membranes the endomysium myofibrils When stimulated by a muscle impulse, what do the terminal cisternae release into the sarcoplasm?" "sodium ions, Na+" "calcium ions, Ca2+" "adenosine triphosphate, ATP" "acetylcholine, ACh" Which of the following is the correct sequence of events for…