In a normal heartbeat the atria contract ______.   A at exactly the same time as the ventricles   B immediately before the ventricles   C immediately after the ventricles   D at the very beginning of ventricular diastole

Q: Which of the following is unique to cardiac musclecells?a. Only cardiac muscle contains a…

A: The cardiac muscles show the characteristics of both smooth and striated muscles. The cells of…

Q: In the cardiac cycle tracings below, which statement is CORRECT? Ventricular Pressure 100 Aortic…

A: Introduction:-  cardiac cycle is set if 8 steps which lead to filling if blood in heart snd then…

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: The major baroreceptor(s) used to regulate blood pressure is/are located in… Group of answer…

A: Baroreceptors sense the change in blood pressure and transmit information to the brain so that…

Q: When is the blood pressure in the left ventricle greater than the blood pressure in the aorta?   A…

A: Cardiac cycle is a cycle through which atrial contraction ends with  ventricular relaxation. When…

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: 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: During surgery, the right vagus nerve was accidently cut. Explain the effect on the heart rate. a.…

A: It has three components: blood, heart and the blood vessels. Heart is derived from the mesodermal…

Q: In the figure below on the left, label the P, QRS and T waves. Describe what is happening in the…

A: The electrical activities of heart are traced with the help of electrocardiogram. Under normal…

Q: Which of the following would be most likely to cause pulmonary congestion?   A failure of the right…

A: Pulmonary congestion is a condition of fluid accumulation occurring in the lungs which leads to…

Q: Describe the action potential of an autorhythmic cell in the heart. a) Indicate how the opening and…

A: Answer 1- the opening and closing of each ion channel affects the membrane potential of the cell can…

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: In humans, blood returning to the heart from the lungs returns toa. the right ventricle. d. the left…

A: In humans, the route of blood through the pulmonary circuit is as follows: Right ventricle -->…

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: se this labelled diagram of a human heart & major blood vessels to answer these iestions. Which…

A: The heart is a muscular organ involved in the pumping of blood to various organs of the body. The…

Q: Which vessel would blood in the right coronary artery pass through next?   A anterior…

A: The circulatory system consists of three systems that work together; the heart (cardiovascular),…

Q: 1. What happens when the pressure in the ventricles becomes lower than the pressure in the atria?…

A: Semilunar valves are valves of the heart and the shape of valves prevents the blood to flow back…

Q: We measured the stroke volume of the left ventricle. What was the average stroke volume of the rig|…

A: The term "cardiac output" (CO) is used to describe the amount of blood pumped up every minute by…

Q: Increased action potentials from the sympathetic nervous system would cause which of the following?…

A: The sympathetic nervous system (SNS) directs the body's fast involuntary response to dangerous or…

Q: A rhythmic beating of cardiac muscle in a mammalian heart is initiated by the _____.…

A: The heart is divided into four chambers consisting of two atria and two ventricles; the atria…

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: In humans, the pacemaker of the cardiac muscle cells is stimulated to increase contraction rate by__…

A: The process during which the contraction of heart increases is called the positive inotropic effect.…

Q: The lining of the heart chambers is called the __________.   A endocardium   B myocardium   C…

A: The heart is the muscular organ that pumps blood throughout the body. It is made of cardiac muscle.…

Q: In humans the wall of the left ventricle is thicker than that of the right ventricle. This…

A: Cardiovascular system The circulatory system is also referred to as the cardiovascular system. It is…

Q: 1- The left ventricular wall of the heart is thicker than the right wall in order to…

A: Introduction :- Near the heart base, the ventricular wall is thickest, and it thins out to 1-2 mm at…

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: Blood leaves the right ventricle through the ______.   A pulmonary trunk   B right atrium   C…

A: The human heart is situated in the middle of the thoracic cavity in a space called the mediastinum.…

Q: A heart murmur would be detected in the pathological situation in which blood was flowing from the…

A: Heart murmurs are defined as the blowing or whooshing sound which is heard during a heartbeat caused…

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…

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: Which component of the heart conduction systemwould have the slowest rate of firing?a.…

A: Step 1 A cardiac conduction system is an array of functional and specialized cardiac muscle cells,…

Q: Nursing When comparing Ist, 2nd and 3rd degree heart block: a. Which has the same contraction rate…

A: In heart blocks, the main problem arises because the contraction from the SA node reaches either…

Q: In ventricular fibrillation, there is no pattern visible in the EKG. What does this mean in terms of…

A: Venticular fibrillation produces irregular electrical signals in the muscles of the ventricles .

Q: Which of the following stimuli may produce an increase in heart rate? Select one: a. a threatening…

A: The correct answer is (c) a picture of a natural disaster.

Q: Even though it is trivial that Beta Blockers might have negative inotropic effect on the heart, but…

A: Beta-blockers act on the Beta 1 receptors which are located in the heart and it slows down the…

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 /…

Q: Looking at the wiggers diagram. Notice, time stamp 370-410msec in the left ventricular volume the…

A: Ventricular diastole It is defined as the period of cardiac cycle during which the two ventricles…

Q: The effective-refractory period present during Phase 2 of the action potential of ventricular…

A: A transient shift in membrane permeability across the cellular membrane of cardiac cells is known as…

Q: The graph in Figure 1 shows the changes in pressure that takes place in the left side of the heart.…

A: A rigorous physical workout is healthy for the body. A walk for 30 minutes or running or bicycling…

Q: a) Referring to the Figure , which part of the heart's electrical conduction is known as the…

A: A pacemaker is a little gadget that is put under the skin in your chest to help control your pulse.…

Q: Vhich of the following is an inaccurate description of autonomic innervation of the cardiovascular…

A: The autonomic innervation of the heart is done by innervation of parasympathetic and sympathetic…

Q: In the pause between the 2nd sound (dub) of one beat and the 1st sound (lub) of the following beat…

A: The heart has two major sounds which are referred to as lub and dub. The first sound of the heart is…

Q: Double-loop circulatory systems are found in adult amphibians, reptiles, birds, and mammals.…

A: The double-circulatory system passes the blood twice through the heart, per circuit. The…

Q: f the sinoatrial node stopped generating action potentials the heart would _____.   A stop beating…

A: The heartbeat starts with an impulse generated by the sinoatrial node (SA node) also known as the…

Dissection

Dissection is the process of cutting up the tissue of a dead or live animal or plant, to do anatomical studies and surgical treatments. The purpose of dissection is to learn more about the overall structure of organs and organ systems and thereby understand the physiology of the organism.