Which of the following is TRUE about action potentials in pacemaker cardiac cells? Select all that apply Group of answer choices They rely on calcium influx for depolarization They have a resting membrane potential of -90 mV They rely on sodium influx for depolarization They display a prolonged plateau phase

Q: Which of the following characteristics imparts autorhythmic cells with the ability to function…

A: Autorhythmic cells are those cells which are excited by self. These cells generates action potential…

Q: Which of the following rows correctly identifies the movement of solutes on the arterial end and…

A: Net filtration pressure of the blood at the arterial end than at the venous end so blood leaves the…

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: After exercising many of you saw an INCREASE in the amplitude of the pulse transducer suggesting…

A: The sympathetic nervous system is stimulated by exercise and various changes take place in body as a…

Q: The Effects of Lifestyle, Sex & Genetics on Blood Pressure Many things might affect heart rate,…

A: The pressure exerted by the circulating blood against the walls of blood vessels is known as blood…

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: What would you expect to occur in heart failure?

A: The heart failure is also known as cardiac failure. It refers to the inability of the heart to…

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: During the Cardiac Contraction cycCle, EARLY ventricular systole is characterised by

A: ventricular systole- It is a phase of cardiac cycle in this the left and right ventricles contract…

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: 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: What is a difference in membrane potential in the auto-rhythmic vs contractile cardiomyocyte auto:…

A: Cardiac tissue consist of muscles which helps in the contraction of the heart. They have two…

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: Automaticity of the heart is the result of: Group of answer choices K+ leaking into the cell. Na+…

A: Automaticity of the heart is the result of:The answer is: more than one of the above.The Heart's…

Q: As a result of heart failure, compensatory mechanisms become activated and ultimately lead to…

A: Correct response to this particular question will be, a reduction in both heart rate and blood…

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: Contractile cardiac myocytes use calcium influx across the plasma membrane for all of the following…

A: "Since you have posted multiple question we will answer the first question for you. If you want…

Q: The pacemaker that determines the heart rate Purkinje fibers The electrical gateway to the…

A: Human heart is myogenic that means it can generates its own electric impulses. In the heart several…

Q: Think of the sodium potassium pump and Digitalis use you studied to treat congestive heart disease…

A: Digitalis is a drug obtained from the dried leaves of the common foxglove (Digitalis purpurea) and…

Q: Which of the following would increase the resistance in a blood vessel? Group of answer choices All…

A: Resistance is a force that opposes the flow of a fluid. The length of a vessel is directly…

Q: Fill in the chart Drug Classification Effect on Heart Rate Epinephrine     Acetylcholine…

A: Cardiac drugs are the drugs that used to improve  or treat the disorders associated  with…

Q: Describe the main theories for the termination of calcium sparks in the cardiac muscle excitation…

A: The answer is well explained above

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: Which of the following would increase the resistance to blood flow? Group of answer choices All of…

A: Blood is a fluid connective tissue that flows in the vessels of the circulatory system. Certain…

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: Do it

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

Q: Which of the following is/are true for the ejection phase of the cardiac cycle? Check all that…

A: For a single complete heartbeat, the pattern of the heart's contraction and relaxation is referred…

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: heart failure is unable to climb a flight of stairs without experiencing dyspnea.

A: Digoxin is a type of cardiac glycoside medication used in the treatment and management of heart…

Q: With endurance athletes, an increased stroke volume at rest will occur because of   Select 3…

A: Stroke volume is defined as the amount of blood that can be pumped out by heart per beat.

Q: What is the easiest way to change blood flow?     change vascular resistance     change blood…

A: Blood flow in the heart has the following steps- Body organs and tissues---- Inferior/superior vena…

Q: Which of these will increase the heart rate? O sympathetic stimulation of SA node O parasympathetic…

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

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: . In a normal individual, heart rate can be determined by the in an ECG.

A: ECG stands for Electrocardiogram.  It is a test which measures the electrical activity of heart.…

Q: The force of contraction can be changed by: can choose more than on e Group of answer choices -…

A: The force of contraction of heart is referred to as cardiac contractibility. It defines how the…

Q: Hypertension increases afterload for the heart which in turn   a-decreases Stroke Volume b-increases…

A: Afterload is the pressure that the heart muscles need to work against to eject the blood…

Q: Which of the following are false about the inward rectifier? OA The inward rectifier current is…

A: Cardiac action potential refers to the series of electrical events occurring in the cardiac myocytes…

Q: Can you help me with questions 21 and 22

A: Hormones are chemical messengers that bind to their specific receptors that are distantly located.…

Q: Which of the following combinations would have OPPOSITE effects in changing heart rate? atropine and…

A: Introduction : Heart rate can be outlined as the speed of a human heart at which it beats. It can be…

Q: Sympathetic stimulation increases the phosphorylation of the Ca2+ATPase in the sarcoplasmic…

A: Sympathetic stimulation is sympathetic nervous system stimulation which causes the increase in heart…

Q: Copynght © 2009 Pearson Education, Inc. -In the diagram above, describe the role of the integrating…

A: The heart is a pumping organ that is central to the cardiovascular system. Though the heart is…

Q: An increase in which of the following would result in a larger stroke volume ? Group of answer…

A: Stroke volume can be referred to as the total volume of the blood pumped out of the left ventricle…

Q: Describe the movement in ions in action potentials of these cells - pacemaker cell - cardiac…

A: Series of changes in various ion concentration such as calcium, sodium and potassium ions that…

Q: Which of the following changes to blood flow is expected to occur as a result of dynamic exercise?…

A: Blood is pushed through the blood vessels by the action of the heart and it is circulated throughout…

Q: Patient in renal failure develops hyperkalemia so that his extracellular [K+] increases from 4.5…

A: The objective of the question is to understand the effect of increased extracellular potassium…

Q: Choose the receptor(s) that mediate the following response: Positive inotropic effect on the heart…

A: The effect that helps the heart to pump more blood with fewer heartbeats is known as the Positive…