What is a difference in membrane potential in the auto-rhythmic vs contractile cardiomyocyte auto: has a plateau; contractile has a pacemaker (rising resting membrane potential) auto: Na flows initiates depolarization; contractile: K+ initiates depolarization auto: unstable resting Vm contractile: stable resting Vm O O

Q: A patient has tachycardia. Would you recommend a drug that prolongsor shortens the plateau of…

A: Tachycardia is a condition that makes our heart beat more than 100 times per minute. There are three…

Q: Jnlike SA node cardiocytes, regular cardiocytes have a resting membrane potential that is . Regular…

A: There are different systems in the human body that perform various physiological processes. All…

Q: Nodal (conductile) cells in the heart differ from other myocardiocytes (contractile cells) in that…

A: There are two major types of cardiac muscle cells present: myocardial contractile cells and…

Q: A decrease in parasympathetic stimulation of the SA NODE Increase in HR;decrease in cardiac output;…

A: The heart has an autorhythmicity trait that allows it to beat without being controlled by the…

Q: As a result of the long refractory period in the contractile cell refractory period, cardiac muscle…

A: Muscles perform various functions as movement, which is the fundamental purpose of muscles is to…

Q: Leaky Na+ channels in the cells of the SA Node do which of the following?   a-allow a slow…

A: d-allow a slow depolarization that eventually reaches the threshold for voltage-gated Ca2+ channels.

Q: In pacemaker cells the movement of __________ into the cell through voltage-gated channels is…

A: The opening of channels that let positive ions flow into the cell can cause depolarization. Flow of…

Q: The heart would develop normally; the ECM composition does not affect cardiomyocyte differentiation…

A: In the myocardium, Extracellular matrix (ECM) is remodeled in association with many cardiovascular…

Q: The conductance of which ion results in phase 2 characteristics in a ventricular myocyte action…

A: The non-pacemaker cardiac action potentials include the atrial and ventricular myocytes and Purkinje…

Q: . ECG depicts the depolarization and repolarization processes of a cardiac cycle. In the ECG of a…

A: The electrocardiogram (ECG) is the total amount of the action potentials of millions of…

Q: Which of the following is NOT associated with cardiac muscle contraction?   Contraction requires…

A: Cardiac muscle is one of the three types of vertebrate muscles. It is an involuntary, striated…

Q: Phase 1 Phase 2 Phase 3 Phase 0 Phase 4

A: Action potential is a brief change in voltage across the cell membrane in a the heart cells. This…

Q: 1. Decreasing heart rate is under the control of what nervous division? 2. What is the resting heart…

A: Acetylcholine released by the parasympathetic nervous system is responsible for the reduced heart…

Q: Which of these is an example of autoregulation? O The increased force response of the heart…

A: Autoregulation is a process that is well equipped in various biological systems within the body. It…

Q: Heart rate during exercise at 75% maximal oxygen consumption is determined primarily by     the…

A: Heart is the pumping organ in the body. It is responsible for pumping the blood to various parts of…

Q: Autorhythmic cells in the SA node intrinsically fire at a rate of - 90 action potentials per minute.…

A: While performing exercise, the cardiovascular apparatus performs two major tasks:- 1. Provides…

Q: effect of exercise on cardiopulmonary function

A: The effects of exercise on cardiopulmonary function: Exercise places a far greater strain on the…

Q: In the absence of neural and hormonal influences the SA node generates action potentials at a…

A: The SA node's primary role is to serve as the heart's natural pacemaker. It starts an action…

Q: Which of these conditions occurs in the repolarization phase of an action potential in pacemaker…

A: When the change in the membrane potential occurs due to voltage decrease, then it is called…

Q: Smooth muscle is responsible for vasoconstriction. True O False

A: Cells are the basic structural and functional unit of all known organisms which help in the process…

Q: Do it

A: Cardiac muscarinic antagonists are the agent that inhibits the function of the muscarinic receptors.…

Q: Explain why Purkinje fibers conduct action potentials morerapidly than other cardiac muscle cells

A: Purkinje fibers are components of the heart's advanced conduction system, which guarantees that an…

Q: Parasympathetic – Slows heart rate because it increases flow through _____ channels and decreases…

A: The parasympathetic nervous system can be defined as the type of nervous system that conserves the…

Q: What would be the drawback of cardiac contractions being the same duration as skeletal muscle…

A: Introduction: The cardiac muscles are responsible for pumping blood into the blood vessels through…

Q: Let's review the electrical events that occur during a heartbeat. Match each phase of the ECG in the…

A: A. The atria depolarize ( P wave)B. The ventricles repolarize (T wave)C. (Diastolic interval; the…

Q: explain how heart rate and stroke volume are regulated include the role of parasympathetic ans…

A: Heart rate: Is the number of times the heart beats in a minute. It is regulated by the autonomic…

Q: The role of the bundle of his, bundle branches, and purkinje fibers is to Help conduct the…

A: Bundle of his, bundle branches and purkinje fibres are all conducting fibres found in the heart.…

Q: #06#

A: We can say that Cardiac tissue consists of muscles that help in the contraction of the heart. They…

Q: You are wisely including a number of cardiovascular-based training routines to help a competitive…

A: Cardiovascular coaching is: 'physical learning that exercises the guts, lungs, and associated blood…

Q: A drug is found to partially inactivate fast sodium channels. Mow would this drug change the action…

A: Given: To find a drug that partially inactivate fast sodium channels. How it change the action…

Q: What are funny channels in the heart? Pacemaker Na channels that open upon membrane depolarization O…

A: Pacemakers- Electrical impulses generated by the heart muscle that causes the heart to beat…

Q: Acetylcholine affects the graded potential of autorhythmic cells

A: Introduction: Autorhythmic cells: The myocardial conducting cells have the ability to originate the…

Q: In a cardiac contractile cell what is the mechanism involved in the change in membrane potential?…

A: The cardiac contractile cell undergoes various changes in order to perform several activities and…

Q: which of the following conditions at the S-A node will cause a decrease in heart rate? increased…

A: The objective of the question is to identify which of the given conditions at the Sinoatrial (S-A)…

Q: Which of the following is NOT true regarding sympathetic stimulation of heart? Select one: Rate of…

A: The Sympathetic system get activated during any emotional excitement , exercise or several other…

Q: Which of the following is false? A Actin and myosin are major components of the skeletal muscle…

A: Muscle system is made up of soft tissues that produces tension which results in the generation of…

Q: Why, in physiological terms, does systolic blood pressure increase from rest to exercise and why…

A: Introduction: Metabolic requirements of the body at rest or during exercise are met by supplying…

Q: Cosider the various components of the arterial baroreceptor reflex and predict whether the following…

A: A. Increase in arterial pressure incrrses depolarization of sensory nerve ending increasing Arterial…