Which of the following is not true about Ventricular cardiac action potentials? O A. Action potentials arise from current flow across membranes. O B. Current is carried by neutral ions. O C. Action potentials fire in an all-or-none fashion. D. A stimulus usually initiates the action potential in healthy cells. E. Potassium is the dominant current during the diastolic interval.

Q: Action potentials pass from one cardiac muscle cell to anothera. through gap junctions.b. by a…

A: The structures which provide adhesion and communication between cells are called intercellular…

Q: Describe the events leading up to contraction in a cardiac contractile cell. (Where does the…

A: Cardiac muscles are similar to skeletal muscles with a few differences:-a) Contraction is…

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 of the following best describes the primary role of resistance vessels? Group of answer…

A: The question is asking to identify the primary role of resistance vessels among the given options.

Q: Afterload is Select one: a. the amount cardiac output must increase during exercise. b. the…

A: The objective of the question is to identify the correct definition of the term 'afterload' in the…

Q: On an electrocardiogram (EKG), the electrical resetting of the ventricles is a. shown by the P wave…

A: An electrocardiogram (ECG or EKG) is a diagnostic test that measures the electrical activity of the…

Q: The AV node delay: a. allows the atria and ventricles to depolarize and contract as a unit. b.…

A: The human heart consists of the left and right atria and the left and right ventricles. The heart…

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: Purkinje fibersa. are specialized cardiac muscle cells.b. conduct impulses much more slowly than…

A: A fully developed adult heart maintains the capability of generating its own electrical impulse,…

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: An ECG measures a. changes in electrical potential during the cardiac cycle. b. Ca2+…

A: Introduction: ECG or electrocardiogram is a machine that helps analyse the condition of the heart.…

Q: Within the T-P interval of the EKG... a. The 2nd heart sound is heard b. the semilunar valves are…

A: a. The 2nd heart sound is heard

Q: A chemical called EDTA, like citrate, binds to (or “chelates”) Ca2+. Suppose a person had EDTA…

A: Blood circulates under pressure through the vasculature. Following vascular injury, escaping blood…

Q: Which neurotransmitter/target receptor combinations would you expect to find in these areas of the…

A: Neurotransmitter and target receptor combinations in the areas of the heart are as follows: SA…

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: If both sympathetic and parasympathetic innervation to the heart conductive system were removed,…

A: As we know The heart is that organ that pumps oxygenated blood into circulation. The heart has four…

Q: why are cardiac muscle cells affected by hyperkalemia? A. All choices below are correct B. Resting…

A: Hyperkalemia is the medical condition which arises from increased levels of Potassium in the blood.…

Q: ich of the following is an accurate descriptione d the subsequent (second) P wave (second cardi

A: Measuring rate and regularity of heartbeat, size, and shape by electrocardiograph, detect tiny…

Q: Cardiac contractility is enhanced by: A. Vagal stimulation. OB. Stimulation of Muscarinic receptors.…

A: Cardiac contractility is the heart's ability to pump blood around the body with force during systole…

Q: The delivery of blood by the left ventricle into the sorta is intermittent, whereas blood flow in…

A: Peripheral circulation refers to blood flow in smaller blood vessels such as arterioles and…

Q: You are testing a compound as cardioactive drug. You know the compound is an agonist of…

A: The sinoatrial (SA) node is known as the natural pacemaker of the heart, responsible for generating…

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: 1)An increase in total peripheral resistance, all else remaining the same, will cause an increase in…

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

Q: A. What could be the implicatiosn for the atrial and ventricular contraction-relaxation? B. Draw…

A: If the pacemaker activity in the atrioventricular (AV) node overtakes the sinus node (SA node)…

Q: The following figure models a part of blood vessel network in two different points. If blood vessel…

A: Introduction:- Blood is the body's fluid in the circulatory system of humans and other vertebrates…

Q: пишпипшити A. Agonal rhythm/asystole B. Atrial fibrillation C. Atrial flutter D. Monomorphic…

A: The electrical activity pattern that regulates the heart's contractions is referred to as cardiac…

Q: Which of the following channels are involved in the action potential in contractile cells of the…

A: An action potential is a sudden, fast, transitory, and propagating shift in the resting membrane…

Q: Cardiac action potentials have _________ duration than neuronal action potentials. A. a shorter…

A: Introduction Unlike the action potential in skeletal muscle cells, the cardiac nerve impulse isn't…

Q: In discussing the cardiac cycle; all are correct except A. Diastole is also known as relaxation B.…

A: The heart is a muscular organ that pumps blood throughout the body. The heart has mainly four…

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: 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 of the following factors will increase the cardiac output? a. decreased heart rateb. increased…

A: The objective of the question is to identify the factors that can increase the cardiac output.…

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: Muscle impulses are spread rapidly between cardiac musclecells bya. sarcomeres.b. intercalated…

A: The heart is a muscular organ , located just behind and slightly left of the sternum. The heart is…

Q: The QRS wave of an ECG is produced by. a. depolarization of the atria. b. repolarization of the…

A: ECG or electrocardiogram is a diagram or graph of the electrical activity of heart that is produced…

Q: Acetylcholine reacting with a muscarinic receptor on a cardiac myocyte causes chloride to flow, or…

A: In human anatomy, the pumping organ of the human body is known as the heart which is made up of…

Q: The carotid artery of an animal is partially constructed proximal to the carotid sinus during a…

A: Introduction:- The carotid arteries are a component of systemic circulation that transport blood to…

Q: During atrial fibrillation: O A. The EKG shows no discernable P wave. O B. There is a noticeable…

A: Human heart consists of four chambers: two atria and two ventricles. The left atria receive…

Q: Once you have studied the wiggers diagram   Create your own outline of the steps with a brief…

A: Cardiac cycle:The cardiac cycle describes the human heart's activity from the start of one heartbeat…

Q: Stroke volume is thea. amount of blood pumped by the heart per minute.b. difference between…

A: End-diastolic volume refers to the quantity of blood in the left or right ventricle at the end of…

Q: The following can be known by using a vascular doppler: Select one: a. If a person has stenosis b.…

A: As this contain 3 multiple questions , each question will be answered in each three steps. Solution…