Which of the following would NOT result from an increase in sympathetic stimulation of the heart?   A increased force of ventricular contraction   B increased calcium concentration in the fluid surrounding the actin and myosin during contraction   C increased heart rate   D increased number of motor units activated   E increased cardiac output

Q: Which of the following characteristics imparts autorhythmic cells with the ability to function…

A: Autorhythmic cells are those cells which are excited by self. These cells generates action potential…

Q: Fill in the blank:  Endings of parasympathetic nerve fibers secrete _______________________, which…

A: The cardiovascular system is responsible for circulating the blood throughout the body so that…

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: Leaky Na+ channels in the cells of the SA Node do which of the following?   a-allow a slow…

A: d-allow a slow depolarization that eventually reaches the threshold for voltage-gated Ca2+ channels.

Q: why are cardiac muscle cells affected by hyperkalemia? A. All choices below are correct B. Resting…

A: Hyperkalemia is the medical condition which arises from increased levels of Potassium in the blood.…

Q: [ANIMAL PHYSIOLOGY] You are probably quite nervous about the exam. You notice that your heartbeat is…

A: It is one of the common observation during exam;There is sort of nervousness in us; occur may be due…

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: As a result of heart failure, compensatory mechanisms become activated and ultimately lead to…

A: Correct response to this particular question will be, a reduction in both heart rate and blood…

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: 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: 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: The muscle cells of a heart chamber work as a  functional syncytium.  In terms of heart function…

A: The heart is a meso-dermally derived organs. The walls of heart are made up of cardiac muscles.…

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: 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: What is the role of Ca2+ in the shape and duration of an action potential. (Cardiac muscle cell)

A: The duration of an action potential for cardiac muscle cell is between 200-250 milliseconds. There…

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: Which ONE of the following statements is TRUE? OA Cardiac myocyte contraction results primarily from…

A: Given here are some statements . Following I will be discussing which among them is correct and…

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: Action potentials in the ventricular cardiomyocytes differ from those in the SA node in that action…

A: Heart is the organ that pumps blood to all regions of the body. Muscles of the heart (cardiac…

Q: Why is your heart rate high after running a short distance, but not as elevated after running a much…

A: Introduction: To maintain blood circulation throughout the body, the heart beats nonstop. Its rate…

Q: Repolarization of ventricular myocardiocytes is caused by ______ the cells through voltage-gated…

A: Repolarisation is caused by the movement of positively charged k+ ions out of the cell. it initially…

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: Calcium channel-blocking drugs are sometimes given to patients with heart problems. If a patient is…

A: We know that Calcium channel blockers are a group of antihypertensive drugs, which disrupt the…

Q: In a patient given a cardiac glycoside, important effects of the drug on the heart include which of…

A: Cardiac glycosides are medicines for treating heart failure and certain irregular heartbeats. They…

Q: A 32-year-old male is diagnosed with primary hypertension. His physician recommends a new drug for…

A: In any organism, the heart's job is to keep "blood" flowing constantly throughout the body. Blood…

Q: Below are drawings of three different action potentials. Two of these occur in the heart, and one…

A: An action potential is a term that denotes the change in the resting membrane potential upon stimuli…

Q: The movement of which two ions is responsible for maintaining the plateau phase of the action…

A:

Q: Sympathetic stimulation increases the phosphorylation of the Ca2+ATPase in the sarcoplasmic…

A: Sympathetic stimulation is sympathetic nervous system stimulation which causes the increase in heart…

Q: How would the left ventricle of a patient who had had high blood pressure for many years differ from…

A: Answer: Introduction: Left ventricular hypertrophy is expansion and thickening means hypertrophy of…

Q: During work, blood flow through a muscle can increase 20 times but the cardiac output does not…

A: Vasoconstriction of blood vessels reduces the volume of blood vessels. Hence blood flow is also…

Q: Which of the following is a predicted outcome in a mammal heart that entirely lacks valves?   A.…

A: The circulatory system is one of the most essential systems in the body. The function of the…

Q: One of the common antihypertensive agents is a class of medicines called calcium- channel blockers.…

A: Answer :- Option (C) is correct. - They reduce heart rate. - They block entry of calcium into heart…

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: Parasympathetic nerves _____.   A cause smooth muscle in blood vessel walls to contract   B cause…

A: Autonomic nervous system is divided into two divisions known as sympathetic and parasympathetic…

Q: Which of the following channels is responsible for generating the long plateau found in the action…

A: Answer :- Option (B) is correct.   - slow Ca2+ channels.

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: Why is resting heart rate somewhat slower than the 80–100 bpm set by the SA node? The AV bundle…

A: Heart rate refers to the rate or the number of beats in one minute. Heart rate differs between…

Q: The amount of force that the ventricles produce in a contraction can be increased through ____.   A…

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

Q: Which of the following are TRUE, when describing the Action Potential of a Non- Contractile Cardiac…

A: Introduction A transient shift in voltage (membrane potential) across the cell membrane of heart…

Q: Which of the following would not increase Cardiac Output? A. increase blood epinephrine…

A: The amount of blood pumped by the ventricles in 1 minute is measured in terms of cardiac output…

Q: The left ventricular wall of the heart is thicker than the right wall in order to ________.   A…

A: Heart is muscle which pumps blood to all parts of your body to provide it with the oxygen and…

Q: Which of the following best describes the mechanism of action of a cardiac glycoside? A)…

A: Cardiac glycosides are the compounds that are important for enhancing the force of heart to increase…

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…

Q: Discuss the differences between myogenic and neurogenic hearts and explain what the role of…

A: The heart is the main organ for the circulation of blood and transportation of oxygen throughout the…

Q: Scenario: A patient arrives at the clinic complaining of an increased heart rate and is feeling some…

A: Venous return means the blood flow back to the heart.