Why is it important that there be a long plateau phase of the cardiac contractile cell?
Homework Answers
it is important for the cardiac muscle to have a plateau phase after the repolarization stage in which there is a fast sodium channel opening when potassium flux decreases. the depolarization occurs when calcium channel is an electrically balanced state. After the calcium ions, permeability has decreased the action potential is the inward movement of potassium ions is increased in repolarization state (-90mV).
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Why
is it important that there be a long plateau phase of the cardiac
contractile cell?
Complete the Concept Map to describe ionic movement during action potentials in cardiac pacemaker and contractile...
Complete the Concept Map to describe ionic movement during
action potentials in cardiac pacemaker and contractile cells, and
trace the conduction pathway.
pacemaker cells K+ ions Ca2+ ions cardiac muscle fibers Na ions SA nodes AV nodes, Reset Help bundles, branches and Purkinje fibers rapidly depolarize due to influx of directly trigger atria to contract and activate enter plateau phase due to slow influx of repolarize due to efflux of directly trigger ventricles to contract and activate directly trigger atria...
All of the following are true about the refractory period in cardiac muscle, except A. it...
All of the following are true about the refractory period in cardiac muscle, except A. it results from the plateau phase of the action potential. B. it is much longer than the refractory period in skeletal muscle. C. it is observed in both contractile and autorhythmic cardiocytes. D. it prevents complete tetanus. E. it prolongs the action potential until the muscle cell has begun to relax.
The resting membrane potential of cardiac muscle cells (the contractile cells) is approximately -90 mV. The...
The resting membrane potential of cardiac muscle cells (the contractile cells) is approximately -90 mV. The resting membrane potential of typical neurons is approximately -60 to -70 mV. Why is the resting potential of cardiac muscle cells lower than that of a typical neuron?
Please compare and contrast action potentials in cardiac autorhythmic cells and cardiac contractile cells, including drawings...
Please compare and contrast action potentials in cardiac autorhythmic cells and cardiac contractile cells, including drawings to illustrate your discussion. Would increased sympathetic nervous system activity affect either of these cells? If so, please describe how, including the cellular mechanism that produces the effect. What effect(s) would this have on overall cardiac function?
Please answer all parts. Thanks in advance 19) Which statement(s) is(are) NOT true regarding cardiac muscle?...
Please answer all parts. Thanks in advance
19) Which statement(s) is(are) NOT true regarding cardiac muscle? Choose ALL that apply. (2.5 pts) a) Autorhythmic cells do not contribute significantly to the force of heart contraction because they do not contain many myofibrils. b) Cardiac muscle consists of autorhythmic fibers and contractile fibers. c) Cardiac muscle is similar to skeletal muscle since t contains thick and thin filaments, d) Cardiac muscle is similar to skeletal muscle in that the muscle fibers...
Diagram how an action potential generates contraction (excitation-contraction coupling) in a cardiac muscle cell. Compare and...
Diagram how an action potential generates contraction (excitation-contraction coupling) in a cardiac muscle cell. Compare and contrast cardiac muscle cell action potentials (both autorhythmic and contractile cells) and contraction with those in skeletal and smooth muscles. (be sure to discuss refractory periods & summation/tetanus in each type of muscle).
7. Electrical and contractile events of muscle are related, and their timing is sequential. Explain these...
7. Electrical and contractile events of muscle are related, and their timing is sequential. Explain these pictures - what happens during the lag? Twitch Omv- action potential Skeletal -90 mV contraction cardiac - relaxation phase contraction phase delay Action potential teau phase Muscle contraction Muscle contraction MV or muscle contraction MV or musde contraction 100 300 100 200 200 Time (ma) Time (ma)
QUESTION 8 The second phase of the sexual response cycle is excitement plateau orgasm resolution
QUESTION 8 The second phase of the sexual response cycle is excitement plateau orgasm resolution
Why is the reconnaissance phase an important step for a hacker?
Why is the reconnaissance phase an important step for a hacker?
8. Use this trace of actio (6) n potentials produced by a cardiomyocyte to answer the...
8. Use this trace of actio (6) n potentials produced by a cardiomyocyte to answer the following questions. 90 L a. Is this a trace from a contractile cell or a pacemaker cell? Circle one. b. The type of channel responsible for causing the plateau phase of this cell is c. Imagine that a toxin caused L-type Ca channels to remain open half as long as usual. On the axes above, draw another trace of action potentials, showing the changes...
Complete the Concept Map to describe ionic movement during
action potentials in cardiac pacemaker and contractile cells, and
trace the conduction pathway.
pacemaker cells K+ ions Ca2+ ions cardiac muscle fibers Na ions SA nodes AV nodes, Reset Help bundles, branches and Purkinje fibers rapidly depolarize due to influx of directly trigger atria to contract and activate enter plateau phase due to slow influx of repolarize due to efflux of directly trigger ventricles to contract and activate directly trigger atria...
Please answer all parts. Thanks in advance
19) Which statement(s) is(are) NOT true regarding cardiac muscle? Choose ALL that apply. (2.5 pts) a) Autorhythmic cells do not contribute significantly to the force of heart contraction because they do not contain many myofibrils. b) Cardiac muscle consists of autorhythmic fibers and contractile fibers. c) Cardiac muscle is similar to skeletal muscle since t contains thick and thin filaments, d) Cardiac muscle is similar to skeletal muscle in that the muscle fibers...
7. Electrical and contractile events of muscle are related, and their timing is sequential. Explain these pictures - what happens during the lag? Twitch Omv- action potential Skeletal -90 mV contraction cardiac - relaxation phase contraction phase delay Action potential teau phase Muscle contraction Muscle contraction MV or muscle contraction MV or musde contraction 100 300 100 200 200 Time (ma) Time (ma)
QUESTION 8 The second phase of the sexual response cycle is excitement plateau orgasm resolution
8. Use this trace of actio (6) n potentials produced by a cardiomyocyte to answer the following questions. 90 L a. Is this a trace from a contractile cell or a pacemaker cell? Circle one. b. The type of channel responsible for causing the plateau phase of this cell is c. Imagine that a toxin caused L-type Ca channels to remain open half as long as usual. On the axes above, draw another trace of action potentials, showing the changes...
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