Cardiac output cannot increase indefinitely because (a) available filling time becomes shorter as the heart rate increases. (b) the cardiac center adjusts the heart rate. (c) the rate of spontaneous depolarization decreases. (d) the ion concentrations surrounding pacemaker plasma membranes decrease.

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: What type of catabolism occurs in the heart?

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Q: What are the mechanisms that assist in returning venous blood to the heart?

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Q: (i)List the major blood vessels and their origins involved in coronary circulation. (ii) At what…

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Q: Based on what we learned in this lecture, what is likely to happen to the heart rate in Patient SM…

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Q: Increased CO2 levels in tissues would promote, (a) contraction of precapillary sphincters. (b) an…

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Q: Which of the following statements are true? (a) The left ventricle wall is thicker than the right…

A: It is related to the circulatory system

Q: Blood flow into the _______________ would ________________if the right side of the heart failed.…

A: Introduction: To supply blood, the heart encloses four chambers. The blood flow cycle is completely…

Q: The QRS complex of the ECG is produced when the, (a) atria depolarize. (b) ventricles depolarize.…

A: An electrocardiogram is used necessarily and generally in hospitals to record the electrical signals…

Q: Blood pressure can be significantly affected by (a) cardiac output (b) peripheral resistance (c)…

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Q: Elevated levels of the hormones ADH and angiotensin II will produce (a) increased peripheral…

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Q: During this experimental activity (effect of stroke volume), the flow rate stayed constant because…

A: Introduction: The volume of the blood pumped out by each ventricle into the circulation per minute…

Q: During isovolumetric ventricular contraction: a) all valves are open and pressure within the…

A: The term isovolumetric contraction includes the prefix word ‘iso’ which means ‘equal’. So, the word…

Q: 23333 The aortic valve opens at which of the following lettered points on the ventricular volume…

A: Aortic valve is present between left ventricle and aorta.  Aortic valve opens during left…

Q: Where is the sinoatrial node located? (A) Between the left atrium and the left ventricle (B)…

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Q: Identify the correct order of the blood flow pathway? (A) the pulmonary arteries carry oxygenated…

A: Introduction: The cardiovascular or the circulatory system is the body's transport system. This…

Q: 30. S₂ occurs at which of the following lettered points on the ventricular volume curve? OA) Volume…

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Q: Mrs B had a heart transplant and as a result, she no longer has nerve supply to her heart. Keeping…

A: The heart transplant, or a cardiac transplant, is a careful transfer system performed on patients…

Q: John is your 68-year old neighbor who was recently told by his doctor that his heart’s main…

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Q: Select the best answer or answers from the choices given: The activity of the heart depends on…

A: All the above

Q: The closure of the mitral valve (bicuspid valve) A) is represented by the P wave on the EKG C)…

A: Note: Option B is missing but the answer is present within the given 3 options.  The heart consists…

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: What is the most characteristic feature of a wandering pacemaker rhythm?

A: The Heart is a vital part of the body, it supplies the blood to the various body part, organs. It is…

Q: A) The term used to describe one complete heartbeat, or the time for both contraction and relaxation…

A: The heart is a vital organ in the human body and is the center of the circulatory system. It is a…

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

A: The sinoatrial node is a smaller body of cells present in the right atrium and is composed of…

Q: Increased contractility of the heart results in all of the following EXCEPT (A) increased stroke…

A: The contractility of heart is the heart ability to eject a particular stoke volume at given preload…

Q: Which organs have an increased proportion of cardiac output during exercise? Which receive a…

A: Cardiac output is also called heart output. It describes the blood volume being pumped by the heart…

Q: What condition(s) does increasing the diameter of the left flow tube simulate in the human heart…

A: The cardiovascular system of the body is principally accountable for transporting the blood in the…

Q: Where the action potential is generated (i.e. atria or ventricles) 2) What actions are occurring…

A: The heart is a huge muscular pump that is divided into two halves,  the right and the left. The…

Q: How would you explain the flow of electrical activity through the heart

A: Answer.  Flow of electrical activity of heart ---- Heart is made of connective tissue. Heart is…

Q: The aortic valve closes (a) at the same time the mitral valve closes, (b) just after the atria…

A: The human heart consists of four chambers. The two upper chambers are called right atrium and left…

Q: Blood within the veins is prevented from flowing away from the heart because of the presence of: (a)…

A: The blood in the body is carried through blood vessels. The arteries and veins are the blood…

Q: List the major blood vessels and their origins involved in coronary circulation. (ii) At what stage…

A: Heart, a muscular blood-pumping organ that is located in the thoracic cavity. It consists of…

Q: Which part of the conducting system of the heart is localized in the interventricular septum? (a)…

A: The collection of nodes and specialised conduction cells form the cardiac conduction system involved…

Q: When moving from lying down to standing, blood pressure would drop most significantly where?     a)…

A: Hypertension also called High blood pressure  which is the blood pressure that is higher than normal…

Q: Blood flow through the capillaries is steady despite the rhythmic pumping action of the heart…

A: In a complicated system of arteries, veins, and capillaries, the heart pumps oxygenated and…