Action potential of the heart it occurs when the cell reaches a point of stimulation, the sodium channel opens and rushes into the cell, this positive flow of electrons into the cell results to an electrical potential Phase 3 Phase O Phase 1 Phase 2

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: 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: 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: 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: When Ca2+ is released from troponin in the sarcomere, what is happening at the level of the heart?…

A: Calcium plays a vital role in muscle contraction. It interacts with protein actin and myosin. The…

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Q: The heart beats without extrinsic stimulation from the autonomic nervoussystem. True or False

A: The autonomic nervous system can be defined as the type of nervous system which controls the body…

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: The pressure in the veins sufficiently high to drive the flow of blood into the heart is callec O…

A: The heart is a fist-sized organ that pumps the blood throughout the body. It is the primary organ of…

Q: Which ion movement causes depolarization in the contractile cells of the heart? Ca++ leaving the…

A: The human circulatory system is responsible for the circulation of blood through the body. It is…

Q: Words Clues Lagus Parasympathetic nerve that activates the muscarinic receptors in the heart 4 5…

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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: An increase in heart rate leads to a increase in arterial pressure leads to a in end diastolic…

A: The heart is the central organ of the cardiovascular system of the body. It is a myogenic organ that…

Q: Which part of the heart is responsible for the muscular contractions that pump blood through it?…

A: Heart is a muscular organ present in thoracic cavity which helps in blood flow through out the body.

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: 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: 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: All of the followings are correct about the myogenic pacemaker except, --------------------- They…

A: The cardiovascular system is a principal organ system of the human body concerned with the transport…

Q: also contract with the rest of the cells in the heart wall. are special neurons that convey signals…

A: Sinu atrial nodes are specialised myocardial structures located in the right Atrium which causes the…

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: 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: 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: lar systole begins ventricular relaxation

A: Cardiac cycle : It is the sequence of events that occur from beginning of one heartbeat to the…

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: Decreasing vascular decreasing cardiac will decrease blood pressure. or Dilation; contractions…

A: Blood is the primary transport fluid of the human body. It transports several important factors like…

Q: Which chamber of the heart has to contract against the greatest afterload?     right ventricle…

A: Afterload is the pressure which heart has to overcome to open the aortic valve and eject the blood…

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: Unlike skeletal muscle, cardiac muscle doesn’t undergo tetany. Explain how this is achieved and why…

A: Cardiac muscle or myocardium is the muscle that forms the heart tissue. These are striated and…

Q: Path of Blood in Heart Ventricles pump blood to body or lungs Atria fill with blood from body or…

A: The blood vascular system or the circulatory system is the transport system of the body. The…

Q: . The right side of the heart pumps receives blood from the systemic circulation and sends it to i…

A: A network of blood vessels are involved in circulating blood to all the parts of the body. The heart…

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: 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: When during the cardiac cycle do ventricles contain their maximal amount of blood? At the end of…

A: Cardiac cycle is referred to as the time period between the contraction of atria and the relaxation…

Q: Which of the following are pacemakers of the heart? Choose all that apply. AV node SA node Cardiac…

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

Q: the liquid viscosity is density intendent. True O False during the diastolic of the cardiac cycle…

A: Introduction  When the membrane potential of a specific cell region rapidly rises and falls, it is…

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…