Ventricular relaxation immediately follows ________.a. atrial depolarizationb. ventricular repolarizationc. ventricular depolarizationd. atrial repolarization

Q: In a normal heartbeat the ventricles begin to contract ______.   A at exactly the same time as the…

A: The blood circulating through the circulatory system is responsible for the transport of oxygen and…

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: When ventricular walls relax: a. Mitral valve opens & tricuspid valve closes b. Tricuspid valve…

A: Mitral valve is also called the bicuspid valve  and it connect left Atrium to the left ventricle.…

Q: Reductions in heart rate are normally caused by _____.   A sympathetic stimulation of the…

A: Heart rate is controlled by the two branches of the autonomic (involuntary) nervous system. 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: 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: When the ventricles are no longer acting as a syncytium and can't pump blood, they are in ____.…

A: The conditions where the heart of a normal person is unable to function properly is called as heart…

Q: Compared to the ventricles, the atria ____.   A do not contract as many times per minute   B…

A: It also removes waste products from the body. It has three components: blood, heart and the blood…

Q: Parasympathetic stimulation of the sinoatrial node ______.   A is necessary; without it the heart…

A: Parasympathetic system of the body is responsible for the body's rest and digestion response when…

Q: Drugs that increase the heart rate have __________a effect.a. myogenicb. negative inotropicc.…

A: Answer is e.) positive chronotropic.

Q: The vessels that carry oxygen to the myocardium are called __________.   A pulmonary arteries   B…

A: Blood is the body fluid that flows in tube-like structures known as vessels and functions in the…

Q: Moving from a SUPINE to a STANDING position result in an:  a. decrease in heart rateb. increase in…

A: The question is asking about the physiological changes that occur in the body when moving from a…

Q: Diastole is associated with which of the following? a. The P wave of the ECG o b. Isovolumetric…

A: Heart is the part of circulatory sytem. It is responsible for pumping the blood to different parts…

Q: Between the second sound of one beat and the first sound of the next beat the _____.   A semilunar…

A: Heart sounds are generated by blood flowing in and out of the heart’s chambers through the valves as…

Q: The finest passages through which electrical signals pass before reaching the ventricular…

A: Introduction: The muscle of heart is composed of small cells through which electrical signals are…

Q: ulmonary circulation differs from systemic circulation in that the______.   A blood pressure in…

A: Pulmonary circulation moves blood between the heart and the lungs. It transports deoxygenated blood…

Q: If the left ventricle failed to pump blood effectively, blood would back up in the _____."   A left…

A: HEART FAILURE (HF) -The most common type of HF is left-sided HF. The left side of the heart must…

Q: The patient's ECG indicates that _____.   A action potentials are passing from his atria into his…

A: Electrocardiography -- The process by which electrocardiogram is done defined as electrocardiography…

Q: At the time point indicated on the ECG ____.   A blood would be flowing from the ventricles into…

A: An electrocardiogram can be defined as the type of test in which the heart's electrical activity is…

Q: Prothrombin is converted to thrombin during the ________.a. intrinsic pathwayb. extrinsic pathwayc.…

A: The process initiated by an injured blood vessel to decrease the rate of blood flow and trigger the…

Q: The atrioventricular valves open because ______.   A relaxation of the ventricles causes the…

A: Atrioventricular valves These are the valves which connect the atrium to the ventricles. There are…

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: After passing through the inferior vena cava blood passes through the ____.   A coronary sinus   B…

A: The cardiovascular system or circulatory system is comprised of blood pumping muscular organ, heart,…

Q: The cardiac plateau is mediated by ________ and it________ ventricular repolarization. Group of…

A: The cardiac plateau is a phase in the cardiac action potential. This phase is characterized by a…

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 second heart sound is caused by: a. closure of the aortic and pulmoary valvesb. vibrations in…

A: The objective of this question is to understand what causes the second heart sound in the cardiac…

Q: ne symptom of right ventricular failure would be _____.   A difficulty breathing when lying in the…

A: The right ventricle moves deoxygenated blood from the heart back to the lungs to be resupplied with…

Q: Cardiac output measures blood ejected from a. both atria each minute b. each ventricle each minute…

A: Cardiac output refers to the volume of blood that is pumped by the heart per unit of time, usually…

Q: In a patient with _______ some of the oxygenated blood returning to the left atrium would be pumped…

A: The blood enters the heart's right atrium from the body, where it moves to the right ventricle and…

Q: The sinoatrial node sets the pace for the heart as a whole because sinoatrial node cells _____.   A…

A: The human heart is located in the mediastinum (It is the central place in the chest or thoracic…

Q: The function of the right and left bundle branches is to _____.   A rapidly transmit action…

A: The atrioventricular bundle (bundle of His) is a continuation of the specialized tissue of the AV…

Q: An ectopic pacemaker refers to the condition in which _____.   A the rate at which the SA node…

A: An ectopic pacemaker refers to the condition in which the rate at which the SA node cells undergo…

Q: Cells of the sinoatrial node __________ during the pacemaker potential

A: SAN (sino-atrial node) is a compact mass or node of specialized cardiac muscle and is present in the…

Q: Which portion of the ECG corresponds torepolarization of the atria?a. P waveb. QRS complexc. T…

A: The cardiac action potential refers to a brief variation in the membrane potential through the cell…