In the myogenic response, ________.a. muscle contraction promotes venous return to theheartb. ventricular contraction strength is decreasedc. vascular smooth muscle responds to stretchd. endothelins dilate muscular arteries

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

A: Answer is e.) positive chronotropic.

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: Coronary vessels - these su -They can be seen in the lo side of the heart. not reproe ona B.…

A: The heart is a muscular organ the size of a fist that is found just behind and just to the left of…

Q: you have a patient with heart murmer. Her tricuspid valve will not close properly. Explain how this…

A: The murmer is the sound of blood flowing.It may be passing through an abnormal heart valve, or it…

Q: When carotid and aortic baroreceptors reduce their output, _______. Select all that apply. Group…

A: Baroreceptors are mechanoreceptors that identifies the fluctuations in the blood pressure. They are…

Q: veins have almost no blood pressure. How, then, is blood returned to the heart from the legs in…

A: Blood vessels are one of the three (*the others being the heart and the blood) components of the…

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: Put the progression of the electrical excitation of the heart muscle in the right order Atrial…

A: Circulatory system is a part of body system which is involved in circulation of body fluids like…

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: The cardiac skeleton electrically insulates the atria from the ventricles? Why is this important?

A: The cardiac skeleton electrically  insulates the atria from the ventricles. The fibrous skeleton…

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: In veins the ______ than in capillaries.   A blood pressure is higher and flow velocity is slower…

A: The Blood vessels are the part of our vascular system that is responsible for transporting blood and…

Q: The first heart sound is heard as the ECG records the end of the ______.   A P wave   B T-P…

A: An electrocardiogram (ECG or EKG) records the electrical signal from your heart to examine for…

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: Fibrillation is an asynchronous contraction of cardiac muscle fibers. Is atrial fibrillation or…

A: The heart is a muscular organ the size of a fist found just above and just to the left of the…

Q: During a heart attack, the blood flow to cardiac muscle tissue is blocked, and cardiac muscle cells…

A: The heart is a major organ in the circulatory system whose function is to pump blood throughout the…

Q: During diastole the blood pressure in the left ventricle is _______.   A lower than the pressure in…

A: The heart is a highly muscularized, involuntary organ of the body. It has four chambers consisting…

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

A: Acute myocardial infarction

Q: Myocardial contraction is named _____            Relaxation of heart named ______  What is the unit…

A: The heart is a specialized organ of our circulatory system composed of cardiac muscle tissue. It…

Q: describe cardiac pacemaker cells then give two functions of the cardiac pacemaker cells.

A: The heart is a muscular organ, which pumps blood throughout the body. It is located in the middle…

Q: Acetylcholine affects the graded potential of autorhythmic cells

A: Introduction: Autorhythmic cells: The myocardial conducting cells have the ability to originate the…

Q: In the case where a single valve unit in a vein fails so the weight of the blood is held up by the…

A: Varix: an abnormally dilated or swollen blood or lymph vessel and especially a vein.The blood moves…

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: turned

A: If cardiac muscles were to suddenly transform into skeletal muscles, several significant…

Q: Blood pressure sounds heard when listening to the brachial artery are caused by _______.   A…

A: Stethoscope is used to hear the sound of blood pressure. These sounds will not be heard through…

Q: ____ is the contractile phase of the cardiac cycle and _____ is the relaxation phase of the cardiac…

A: The pumping of blood in the body is a function performed by heart. Now, the pressure with which the…

Q: This abnormal ECG indicates: A ventricular fibrillation B premature ventricular contractions (PVCs)…

A: phase 0 of the cardiac action potential is characterized by a rapid depolarization due tothe sudden…

Q: Heart muscle cells ______.   A will not contract unless acetylcholine is released at a…

A: Cardiac muscles are known as Myocardium.Cardiac muscles are different from skeletal muscle because…

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

A: Rhythmic pulsation of the heart as a result of an action potential is known as the heartbeat. The…

Q: Fibrillation is abnormal, rapid contractions of different parts of the heartthat prevent the heart…

A: Heart is the main component of the cardiovascular system and it functions to pump blood rich in…

Q: An electrocardiogram (ECG) measures the ____.   A difference in electrical potential between two…

A: An electrocardiogram or ECG is a simple non-invasive test conducted on the patient to check his /…