The cardiac action potential is substantially longer than a neuron potential due to:   Question options:   myocardial contractility   spontaneous depolarization   gap junctions   Ca++ entry

Q: stroke volume, end systolic volume, end diastolic volume, resistance, venous return, mean arterial…

A: Cardiac output is the volume of blood being pumped by the heart, by the left and right ventricle,…

Q: The goal of management of the person with an acute myocardial infarction is t0 preserve the…

A: The myocardium is the muscular middle layer of the heart's wall, situated between the outer…

Q: Place the labels in order, denoting the sequence of events of the cardiac cycle beginning with…

A: Cardiac cycle is the performance of the human heart from the ending of one heartbeat to 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: 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: cardiac cycle includes all the events associated with the flow of blood thre heart during a single…

A: Heart consists of four chambers, two upper chambers called atrium. and two lower ventricles. All…

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: Some diabetics develop abnormal ECGS before they show obvious symptoms of heart disease. For…

A: Electrocardiogram(ECG or EKG) a painless diagnostic test is performed to measure the electric…

Q: Why is it necessary for cells of the cardiac atria and ventricles to contract in a coordinated…

A: Introduction :- Blood from the veins enters the two atria, which have thin walls. The heart's two…

Q: The ECG records the electrical stimulation of cardiac muscle by theconduction system and not the…

A: Electrocardiogram (ECG) is used to measure the changes in the electrocardiograph. One cardiac cycle…

Q: Explain how Cardiac output is controlled and affected by the following factors: 1. the atrial and…

A: Atrial reflexes is in action when there is venous return to the heart. Baroreceptors in the superior…

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: Depolarization / Repolarization Systole / Diastole ECG Wave Heart Chamber P-wave Atria Atria…

A: Electrocardiogram is a graphic representation of the electrical activity of the heart recorded…

Q: The cardiac cycle includes all the events associated with the flow of blood through the heart during…

A: Human heart is four chambered. The left half of the heart act as the pump for systemic circulation…

Q: patient displays an ECG abnormality consistent with atrial enlargement. Which ECG wave/interval do…

A: Electrocardiogram represents the electrical activity taking place inside the heart. Heart consists…

Q: Describe the causes of the P, QRS, and T waves of an ECG, and indicate at which point in the cardiac…

A: The cardiac cycle represents the event that occurs after the ending of one heartbeat to the start of…

Q: Plot the tension in the left ventricle, assuming that only the diameter changes during the cardiac…

A: The blood flows through the systemic and pulmonary circulation following a specific pathway known as…

Q: This will result in:

A: This will result in an increase in preload.Preload is the amount of force that stretches the…

Q: Give a detailed mechanism of action of a name drug or agonist that results in positive inotropic…

A: Positive inotropy refers to the increase in the force of contraction of the cardiac muscle. One of…

Q: (a) What is the stroke volume for the control patient? 100 mL (b) A healthy heart rate (HR) is…

A: Cardiovascular system is mainly consist of heart, bloor vessels  and blood. It transport nutrients…

Q: The pacemaker potential describes a slow depolarization of the membrane from -60 mV to -40 mV to…

A: A small structure known as the sinoatrial node (SAN) is located in the right atrium, close to the…

Q: Cardiac output is determined by what two variables ? preload and afterload end - diastolic volume…

A: Cardiac output, otherwise called heart output, is a term utilized in heart physiology that portrays…

Q: A drug that blocks the cardiac muscarinic receptor might be expected to: Increased heart rate…

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

Q: Which phase of the cardiac cycle has the largest influence on the Frank-Starling mechanism? systole…

A: Introduction :  The cardiac cycle is the series of events that take place throughout each heartbeat,…

Q: The heart is resting during Select one: ventricular systole. the ejection period. ventricular…

A: Cardiac cycle The cardiac events that occur from the beginning of one heart beat to beginning of…

Q: Define the terms depolarization and repolarization with respect to heart’s activity.

A: Cardiovascular action is a short-term change in voltage i.e. the power of the membrane throughout…

Q: Which of the following interventions will increase cardiac stroke volume? increased activity of…

A: Stroke volume: The quantity of blood discharged from the ventricle during each cardiac cycle is…

Q: During the isovolumetric periods there is no change in volume.

A: Isometric contraction or isovolumetric  period is an event that occurs in the early stages of…

Q: Define cardiac output in words and with a simple mathematical formula.

A: The heart is one of the most essential organs of the body. It is essential for the working of every…

Q: Which of the following conditions can cause irregularities in the sound of the heart?       Mild…

A: Decrease in Heart rate - Bradycardia. Increase in heart rate = Tachycardia.

Q: A normal patient has an ECG monitor attached to him/her as he/she Slar S exercises at the gym. The…

A: Blood flow through the heart Blood comes into the right atrium from the body through superior and…

Q: Potential differences between positive and negative electrodes that are generated by electrical…

A: Depolarization is the change in the membrane potential of a cell from a negative to a positive value…

Q: The arterial p02 is relatively low in an individual suffering from congestive heart failure because:

A: pO2 is the partial pressure of oxygen refers to volume of oxygen present dissolved in the blood. It…

Q: An increase in end-diastolic volume always causes an increase in stroke volume in a normal heart…

A: Stroke volume It is the amount of blood that is forced out from the ventricle per cardiac cycle. It…

Q: Read about Pressure and Volume Changes in the Cardiac Cycle. Create a curve showing the Pressure and…

A:

Q: An elderly man presents to the emergency department with chest pain. He has a history of stable…

A: Angina: The pain of the chest due to inadequate supply of oxygen and  reduce blood flow  to the…

Q: Relationship between pressure, volume and ECG Systole Pressure (mmHg) Volume (ml) ECG 120 80- 40-…

A: The cardiac cycle encompasses the series of events that occur during each heartbeat to facilitate…

Q: An elderly man presents to the emergency department with chest pain. He has a history of stable…

A: Angina is a disorder in which, due to inadequate blood flow and less oxygen supply, there is chest…

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…