O Cardio_Phys 6UnansweredWhich of the following channels are involvedin the action potential in contractile cells ofthe heart?ANa+ leak channelsvoltage-gated Na+ channelsCvoltage-gated Ca+2channelsDall of the aboveEB and C only

Autorhythmic cells generate action potential which transfer down to the contractile cells of the…

Answered: Which of the following channels are…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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In a cardiac contractile cell what is the mechanism involved in the change in membrane potential? Depolarization: P wave Repolarization: QRS Complex, Hyperpolarization: T wave Pacemaker: K+ and Na+ flow, Depolarization: Pca rises Repolarization: Pk rises Depolarization: Pna increases, Peak: Na channels close, Plateau: Calcium channels close & Potassium channels open, Repolarization Potassium flows out & Calcium flows in Pacemaker: K+ and Na+ flow, Depolarization: Pca rises Repolarization: Pk rises, 4. If channels close Depolarization: Pna increases, Peak: Na channels close, Plateau: Calcium channels open & Potassium channels close, Repolarization Potassium flows out & Calcium flows out
Valves between which structures of the heart shown in the figure control the direction of the movement of oxygenated blood within the heart and as it is pumped to the systemic circuit?
The entry of calcium into a ventricular muscle cell helps to maintain depolarization of the membrane during the plateau phase of the action potential, but this calcium also performs what other function?
Describe the interactions of actin, myosin, and the troponin-tropomyosin complex in controlling heart function.
Which of the four chambers of the human heart has the thickest muscular wall?
Why does the cardiac muscle have a longer absolute refractory period compared to skeletal muscle?
What action potential of specialized heart cells know the function of each channel and the process?
Which of the following statements best describes the differences in the regulation of cardiac and skeletal muscle contraction? The amount of contractile force actively generated by muscle cells is increased by stretch in skeletal muscle and decreased by stretch in cardiac muscle. Cardiac muscle is stimulated by motor neurons and skeletal muscle by neurones from the autonomic nervous system. Skeletal muscle contractile force is augmented by increasing the firing frequency of action potentials whereas cardiac muscle contractile force is enhanced by noradrenaline increasing calcium influx through ion channels. Ryanodine receptors in skeletal muscle are opened by a mechanism that requires calcium influx whereas in cardiac muscle membrane depolarisation alone without calcium influx is sufficient to open ryanodine receptors.
will auto-submit when time expires espondus password is 515b73158335f6 Question 17 The part of the neuron that normally receives stimuli is called O a Schwann cell O a neurolemma a dendrite Oan axon < Previous
Atrial fibrillation can be caused by wandering re-entrant circuits. What does this mean?
1) Where the action potential is generated (i.e. atria or ventricles) 2) What actions are occurring during this process (i.e. contraction and ion flow) 3) When relaxation occurs
Roberto is a 78-year-old male who has recently been diagnosed with Class III Congestive Heart Failure (CHF). His physician told him that his left ventricle has become stiff and cannot relax. Although there is no current treatment that can “fix” Roberto’s condition, he is prescribed two medications: an ACE inhibitor and beta blockers.Briefly describe how beta-blockers will influence Roberto’s heart function, specifically the physiology of the ventricles.

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Which of the following channels are involved in the action potential in contractile cells of the heart?