What is the consequence of the prolonged plateau of depolarization in ventricular myocytes?   a-it causes ventricular myocytes to contract for a longer time, allowing the ventricles time to empty b-it gives additional time for the atria to contract, filling the ventricles more completely c-it causes repolarization to be delayed which slows heart rate d-it allows the ventricles a moment to rest before completing contraction

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

A: The human heart is a muscular blood pumping organ made up of electrically excitable cardiac muscle…

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 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: Which of the following occurs during ventricular diastole? a-The ventricles contract to force blood…

A: During ventricular diastole, the following occur- b- The ventricles relax and refill with blood c-…

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: 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 are the uses of cardiac troponins?

A: Troponins are a group of protein molecules that are found in skeletal and cardiac muscles. The…

Q: The cardiac cycle consists of a distinct relaxation andcontraction phase. Which term is typically…

A: The cardiac cycle is the process of contraction and relaxation of the heart. The primary function of…

Q: Another disease slows the rate of production of cAMP in both contractile and pacemaker cardiac…

A: There are three different kinds of muscle tissues in vertebrates: skeletal muscle, smooth muscle,…

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: Draw a ventricular muscle cell action potential.

A: The heart is a four chambered structure that is responsible for pumping the blood into the arteries…

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: 3) which of the following is the correct sequence of events during ventricular systole? 1- AV valves…

A: The human heart's activity from the start of one heartbeat to the start of the next is known as the…

Q: Why is the rate of cardiac muscle relaxation faster when a positive inotropic agent is present?

A: Inotropic agents refer to those substances that either increase or decrease the force of contraction…

Q: Explain the origin and conduction of the excitation that leads to a heart contraction. Why is the…

A: Since, there are multiple questions. I have answered the first question only. If you need the…

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: When the heart's electrical system misfires, it's called atrial [term]. The heart starts generating…

A: The heart's electrical system is also called the conducting system of the heart. This system…

Q: If the pressure in the ventricles is higher than the pressure in the atria, but lower than the…

A: Heart valves open and close in response to pressure changes inside the heart chambers. the fluid…

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: How exactly does the heartbeat work? Does the right and left atrium pump blood at the same time? Or…

A: Introduction The heart, a fist-shaped organ is covered by a pericardium which is divided into the…

Q: What part of the brain regulates the heart? Describe theautonomic nerve supply to the heart.

A: The nerve that supplies the heart is autonomic, comprising of both sympathetic and parasympathetic…

Q: Lay all the animals out on your desk and separate them into two groups by presence of a backbone.…

A: The act of classifying living things entails grouping them into categories. Any group's members have…

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: potential

A: Introduction:-The conductive cell's with in the heart established the heart rates and transmits it…

Q: Parasympathetic stimulation also increases the delay between atrial and ventricular contractions.…

A: In physiology, the parasympathetic nervous system is responsible for the stimulation of…

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: What are the three populations of cells in the heart that can act as pacemakers? How do they differ?

A: The heart is a muscular organ and is involved in the pumping of blood via blood vessels. The blood…

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…

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: 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 is not true about early after depolarizations in ventricular cardiac muscle?     A.…

A: Action potential is generated in muscles due to the inward flow of positive ions. This depolarizes…

Q: The entry of calcium into a ventricular muscle cell helps to maintain depolarization of the membrane…

A: A well-working conduction system generates a depolarization wave, which causes the atria and…

Q: Below are drawings of three different action potentials. Two of these occur in the heart, and one…

A: An action potential is a term that denotes the change in the resting membrane potential upon stimuli…