Which of the following channels is responsible for generating the long plateau found in the action potentials of ventricular myocytes?   a-slow Na+ channels b-slow Ca2+ channels c-leaky Ca2+ channels d-leaky Na+ channels

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: A patient is suffering from cardiac arrhythmias. They have atrial fibrillation. Describethe normal…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: Parasympathetic stimulation decreases the heart rate by Decreasing permeability of SA node cells…

A: Parasympathetic postganglionic nerve fibers tend to be vagus nerve and are cholinergic in nature.…

Q: Some people have abnormal cords or bridges of myocardium that extend from atrium to ventricle,…

A: The second most common type of coronary arterial abnormality is the Myocardial bridge. It is the…

Q: +20 A Membrane -20 potential (mV) -40 Threshold -60 -80 0.8 1.6 Time (s) AV node threshold…

A: The SA node and AV node in the heart are responsible for generating electrical impulses that are…

Q: A 43-year-old woman has congestive heart failure after a myocardial infarction. Before the…

A: Cardiac output (CO):- It is the amount of blood that is pumped by the heart (ventricles) per unit of…

Q: Jessica had an abnormal electrocardiogram (ECG) and mild hypokalemia.What is hypokalemia, and how…

A: Numerous body organs work in a coordinated manner. An abnormal condition that hinders optimum body…

Q: Consider the equation cardiac output (CO) = stroke volume (SV) X heart rate Which of the following…

A: Afterload is the pressure the heart must work against to eject blood during systole. When…

Q: Which of the following is TRUE of the cardiac action potential? O The cardiac action potential…

A: The muscle action potential is generated due to the contraction and relaxation of the muscle fiber.…

Q: 'Which of the following ions is not directly involved in the myocardiocyte action potential? copper…

A: The myocardiocyte action potenital is found in the heart cells.

Q: Which one of the following is a matching pair?  A Pulsation of the radial artery - values in…

A: Heart is the muscular organ in most animals that is involved in pumping blood through blood vessels.…

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 your study of neuron physiology, you learned that depolarization is dependent on the sodium entry…

A: Heart can initiate contractions on its own by SA node (Sinoatrial node). It doesn't need external…

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 statement about activation of heart muscle cells is TRUE?   A when a person is resting only a…

A: The electrical conduction system of the heart transmits signals generated usually by the sinoatrial…

Q: If leaky Na+ channels in the cells of the SA Node became more leaky (allowed Na+ through at a faster…

A: Generation of the action potential is a significant characteristic of the cells of the sinoatrial…

Q: Based on the concentration gradient of sodium, potassium, and calcium in cardiac myocytes, which of…

A: In a cell, the plasma membrane separates the internal environment (cytoplasm) from the external…

Q: Drugs inhibiting sodium channels would most likely affect which of the following phases of the…

A: Ventricular action potential occurs when sodium ion channels open that causes depolarization. This…

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

A: The heart is a major muscular organ of the cardiovascular system that is responsible for pumping the…

Q: a patients blood test showed high levels of myocardium-specific troponin, and her ECG showed ST…

A: ST elevation means that ST segment in ECG is abnormally high above the baseline. ST segment…

Q: Exercise-induced stress increases cardiac output and vasoconstriction, so why does the amplitude of…

A: Heart rate is defined as the number of times the heart beats per minute. A typical heart rate ranges…

Q: What event(s) occur during the QRS complex of an electrocardiogram? Select one: a. Repolarization…

A: The objective of the question is to identify the correct events that occur during the QRS complex of…

Q: Compare and contrast the molecular events of the action potential in the pacemaker cells of the SA…

A: The action potential is a crucial physiological process that occurs in both pacemaker cells of the…

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: Predict the consequences for the heart’s pumping effectiveness ifnumerous ectopic foci in the…

A: Ectopic foci are abnormal pacemaker sites outside the sinoatrial node.

Q: The second heart sound is caused by

A: Answer:  The Lub - Dup sound produced by the heart is basically the closing of the heart valves.

Q: Cells in the body have the ability to undergo a transiet depolarization and repolarization. A. Plot…

A: The heart contracts and relaxes to pump blood throughout the body. The contraction is controlled by…

Q: Put the progression of the electrical excitation of the heart muscle in the right order Atrial…

A: Circulatory system is a part of body system which is involved in circulation of body fluids like…

Q: Explain differences between action potentials of cardiac muscle cells and those in nodal cells of…

A: On the surface of the heart, muscle fibers are arranged to form a fused interconnected mass termed a…

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: Contrast action potentials in ventricular muscle cells with SA node action potentials.

A: A fast, sudden, propagating and transitory change of the muscle and nerve cell's resting membrane…

Q: list in sequence the components of the elctrical conducting system of the human heart

A: A pump of muscle tissue consists of a heart and a supply of energy and oxygen is required for the…

Q: Describe the anatomy of movement of the wave of cell depolarization throughout the heart during the…

A: The cardiac cycle:It is comprised of a whole relaxation and contraction of both the atrium and…

Q: Which of the following is not true about the resting Cardiac membrane potential? OA. The membrane…

A: Action potentials are the means of signal transmission generated and conducted by neurons in an…

Q: Why do the coronary arteries carry a greater blood flow during ventricular relaxation than they do…

A: The cardiovascular system is one of the organ systems of the body and its function is to circulate…

Q: raw a ventricular muscle cell action potential in the figure below. Briefly describe the changes in…

A: Similar to skeletal muscle, the resting membrane potential of ventricular cells, is around -90…

Q: Which of the following statements is correct: A rapid ejection occurs during early- ventricular…

A: A. A rapid ejection occurs during early-ventricular systole: This statement is incorrect. The rapid…

Q: Which ONE of the following statements is TRUE? OA Cardiac myocyte contraction results primarily from…

A: Given here are some statements . Following I will be discussing which among them is correct and…

Q: Why is the cardiac action potential propagated more slowly in an AV node cell then in an atrial or…

A: Cardiac action potential  It refers to the short alteration in the voltage i.e. membrane potential…

Q: Why doesn't shortening the diastolic time decrease ventricular filling and thus decrease cardiac…

A: Introduction :- Cardiac output, which is calculated as the sum of stroke volume and heart rate and…

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: People with paroxysmal atrial tachycardia (commonly called "palpitations") are sometimes given drugs…

A: Voltage gated calcium  channels allow the entry calcium into plasma membrane. Inside the calcium…

Q: Which of these accounts for the similarity between the P wave duration and the QRS complex duration…

A: This question dives into the complexities of cardiac physiology, particularly centering on the…