An ectopic pacemaker refers to the condition in which _____.   A the rate at which the SA node cells undergo spontaneous depolarization is abnormal   B "all of the heart cells function independently of one another such that the heart vibrates, but fails to pump blood"   C action potentials in the heart are initiated by a region other than the sinoatrial node   D the endothelial cells

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: 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: 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: 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: If the left side of the heart does not pump well enough to send all the blood contained in the…

A: The heart has four chambers:  1. The two superior which receive chambers are the atria 2. Two…

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: 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: 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: 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: Atrial systole follows _________.     T-wave     Z-wave     P-wave     QRS complex

A: Introduction: The sequence of alterations in the flow and pressure in the cardiac chambers and the…

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: 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: Autorhythmic cells in the SA node intrinsically fire at a rate of - 90 action potentials per minute.…

A: While performing exercise, the cardiovascular apparatus performs two major tasks:- 1. Provides…

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: 1.  which of the following structutre controls heart rate monitoring conceratration of co2 and o2 ?…

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

Q: Ventricular relaxation immediately follows ________.a. atrial depolarizationb. ventricular…

A: The cardiac cycle is the duration of time that starts with atrial contraction and ends with…

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: 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: 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: 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: 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: Erythropoietin is produced by the ____.   A kidney   B anterior pituitary gland   C red bone…

A: Endocrine glands secrete chemical messengers, which are also called as endocrine hormones. The…

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: When heart muscle is suddenly starved of blood so that it dies, this is called ___.     fusiform…

A: Acute myocardial infarction

Q: 54. Atropine Sulfate: a. Decreases heart rate by depressing the SA note and AV node activity b.…

A: Ques 52 & 53 is not clear moreover as per our guidelines we're supposed to answer only one…

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: 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: 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: In the heart, lub - dub refer to, in order, the O closing of all valves simultaneously O closing of…

A: The cardiac cycle explains the cardiac event that occurs during the contraction and relaxation of…

Q: Which of the following would NOT result from an increase in sympathetic stimulation of the heart?…

A: The heart has muscles that contract rhythmically in order to pump blood throughout the body. The…

Q: Your grandfather was told that his SA node (pacemaker) has stopped functioning. Explain how his…

A: The heart is a muscular organ that pumps blood through the blood vessels of the circulatory system…

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: 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: The ""lub-dup"" heart sounds are produced by the _______"   A "opening of the atrioventricular…

A: Heart sounds are heard by auscultation using a stethoscope. It is an important aspect of the…

Q: What effect do you think this mutation will have on his heart rate compared tosomeone with a normal…

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