Why is the cardiac action potential propagated more slowly in an AV node cell then in an atrial or ventricular myocyte? How can be AV conduction affected by hypokalemia?  Briefly explain the mechanism by which the most popular beta-blocker metoprolol would affect cardiac muscle contractility

Q: Parasympathetic stimulation decreases the heart rate by Decreasing permeability of SA node cells…

A: Parasympathetic postganglionic nerve fibers tend to be vagus nerve and are cholinergic in nature.…

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: Trace the biochemical electrical pathways that result in cardiac conduction

A: The collection of specialized cardiac myocytes located in the heart walls that send electrical…

Q: +20 A Membrane -20 potential (mV) -40 Threshold -60 -80 0.8 1.6 Time (s) AV node threshold…

A: The SA node and AV node in the heart are responsible for generating electrical impulses that are…

Q: Slow conduction in the atrioventricular node is associated with which of the following? Group of…

A: An atrioventricular nodal conduction delay can occur in a few disorders and may result in a delay in…

Q: Why is it necessary for cells of the cardiac atria and ventricles to contract in a coordinated…

A: Introduction :- Blood from the veins enters the two atria, which have thin walls. The heart's two…

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 is it possible for acetylcholine to actually cause an increase in stroke volume, even though…

A: Acetylcholine is one of the most vital neurotransmitter in the human body, that is seen in both the…

Q: ich of the following is an accurate descriptione d the subsequent (second) P wave (second cardi

A: Measuring rate and regularity of heartbeat, size, and shape by electrocardiograph, detect tiny…

Q: Compare and contrast the molecular events of the action potential in the pacemaker cells of the SA…

A: The action potential is a crucial physiological process that occurs in both pacemaker cells of the…

Q: Cells in the body have the ability to undergo a transiet depolarization and repolarization. A. Plot…

A: The heart contracts and relaxes to pump blood throughout the body. The contraction is controlled by…

Q: If a heart lacked gap junctions, an organ-level contraction would occur.True/False

A: Cardiac muscles are the striated, involuntary, and branch muscles with a characteristic feature of…

Q: Why is the rate of cardiac muscle relaxation faster when a positive inotropic agent is present?

A: Inotropic agents refer to those substances that either increase or decrease the force of contraction…

Q: Describe the anatomy of movement of the wave of cell depolarization throughout the heart during the…

A: The cardiac cycle:It is comprised of a whole relaxation and contraction of both the atrium and…

Q: What anatomic features slow the conduction rate of the action potential as it passes through the AV…

A: The conduction system is a collection of nodes and specialised conduction cells that initiate and…

Q: Discuss the role that vascular endothelial growth factor (VEGF) and its family of receptors play in…

A: The formation of blood vessels from the existing blood vessels is known as angiogenesis.…

Q: Find the Q10 values from 10-20°C and 20-30°C (given heart rates in bpm at 10°C = 5bpm, 20°C = 10bpm,…

A: The temperature coefficient (Q10) represents the factor by which the rate (R) of a reaction…

Q: Why is the cardiac action potential propagated more slowly in an AV node cell then in an atrial or…

A: Cardiac action potential  It refers to the short alteration in the voltage i.e. membrane potential…

Q: xamine one of the consequences of branching with a simple model shown in the figure. Assume that…

A: Assume that the resistance is R    So the resistance in the parallel 1Ro=1R+1R…

Q: Cardiovascular: How does the PSNS alter a pacemaker action potential? Give the mechanism.

A: The cells of the heart have a specialized function of initiating and conducting impulses for the…

Q: In a cardiac contractile cell what is the mechanism involved in the change in membrane potential?…

A: The cardiac contractile cell undergoes various changes in order to perform several activities and…

Q: Flecainide and propafenone are in Vaughan-Williams (antiarrhythmic) Class IC. What is the clinically…

A: Antiarrhythmics are drugs/medications that are prescribed to patients who are suffering from…

Q: Discuss the mechanism underlying AP generation by cardiac autorhythmic cells

A: Simply put, a cardiac arrhythmia is an abnormal heart rate and/or rhythm that is not biologically…

Q: All of the following serum enzymes are elevated in myocardial infarction, except which of the…

A: MYOCARDIAL INFARTION A myocardial infarction (commonly called a heart attack) is a…