Which of the following is not true about the resting Cardiac membrane potential? OA. The membrane resting potential is equal to the Nernst potential for potassium. B. The membrane resting potential has a low sodium conductance. OC. Balanced current flow gives rise to the resting membrane potential. O D. Pumps and exchangers maintain the background electrical gradients. O E. The Nernst potential for sodium is positive to the resting membrane potential.

Q: The pacemaker cardiac muscle cells rely on ______________ for their action potentials. a. Na+ leak…

A: The pacemaker cells create rhythmic impulses which set the pace for pumping the blood. The pacemaker…

Q: Action potentials pass from one cardiac muscle cell to anothera. through gap junctions.b. by a…

A: The structures which provide adhesion and communication between cells are called intercellular…

Q: Cardiac output increases during exercise due to an increase in both heart rate and stroke volume.…

A: The cardiovascular system has an important role in regulating homeostasis in the human body by…

Q: classify the epithelium below.

A: An epithelium is a type of animal tissue made up of densely packed cells called epithelial cells…

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: The second heart sound ("dub") results from vibrations generated by the A. closing of the AV valves…

A: A normal heartbeat consists of two sounds- LUB and DUB. These sounds often occur as pairs in a…

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: Cardiac output is defined as a. blood pressure times peripheral resistance. b. peripheral resistance…

A: Blood pressure is the force exerted by circulating blood on the walls of blood vessels. Heart rate…

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: If both sympathetic and parasympathetic innervation to the heart conductive system were removed,…

A: As we know The heart is that organ that pumps oxygenated blood into circulation. The heart has four…

Q: In the Sino-Atrial Node which is not true? O A. Shows spontaneous (oscillatory) electrical behavior.…

A: The SA node, which is commonly known as the pacemaker is a half moon like cluster of  myocytes…

Q: During the depolarization phase of the pacemaker potential O a. Ca+2 permeability increases O b. Na+…

A:

Q: A. the fact that one represents a depolarization and the other represents a hyperpolarization. B.…

A: The figure is depicting a voltage-time graph. The red line is observed voltage and dashed line is…

Q: a) Match the regions (Red, Green, Blue) with the functiontions. A. Contraction of the atria B.…

A: An ECG, which stands for electrocardiogram, is a diagnostic tool that records the electrical…

Q: (1)B (2C D(3) (0)A E (4) The figure above represents action potential in plateau for cardiac muscle…

A: The cardiac action potential is a change in the membrane potential of the heart cells. The movement…

Q: In which phase of the ventricular muscle action potential is the potassium permeability the highest?…

A: The phase of the ventricular muscle action potential in which the potassium permeability is the…

Q: NOT true regarding blood vessels conductance? Select one: O a. A measure of the blood flow volume…

A: The heart is a muscular organ the size of a fist that sits directly behind and somewhat to the left…

Q: The pausing of electrical conduction at the AV node is critical to heart function because O ATP…

A: AV mode, also known as atrioventricular mode, refers to the electrical conduction pathway that…

Q: Acetylcholine reacting with a muscarinic receptor on a cardiac myocyte causes chloride to flow, or…

A: In human anatomy, the pumping organ of the human body is known as the heart which is made up of…

Q: 02

A: We can say that Cardiac output is also referred to as minute volume. It is the amount of blood…

Q: How does an increase in heart rate contribute to an increase in blood pressure? O It increases the…

A: The cardiovascular system consists of the heart, blood vessels and blood. The heart pumps blood…

Q: Which of the following are false about the inward rectifier? OA The inward rectifier current is…

A: Cardiac action potential refers to the series of electrical events occurring in the cardiac myocytes…

Q: Cosider the various components of the arterial baroreceptor reflex and predict whether the following…

A: A. Increase in arterial pressure incrrses depolarization of sensory nerve ending increasing Arterial…

Q: Which is not true of Re-entrant Arrhythmias OA. Occurs when there is a "loop" of self excitation. B.…

A: An electrical impulse in the heart that follows a circular course, or re-entrant circuit as opposed…

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: During vigorous exercise, vasoconstriction occurs in the digestive organs, while vasodilation occurs…

A: The physical activity of the body maintains physical and mental health. Those exercises that require…

Q: the herbal supplements bitter orange, also known as synephrine, mimics the effects of…

A: The major neurotransmitter of the sympathetic nervous system are the  acetylcholine and…

Q: Which of the following is true of blood velocity? Y X +0 ARTERIOLE CAPILLARY NETW VENULE

A: The blood flows throughout the body by the help of different blood vessels that connect the entire…

Q: Cardiac output is: A. The volume of blood pumped over a period of time. OB. The stroke volume times…

A: The cardiovascular system is a crucial component of the circulatory system in humans (which is often…

Q: The Frank-Starling Law says that stroke volume a. is constant b. increases with deceased blood…

A: Stroke volume refers to the amount of blood ejected by the left ventricle of the heart in a single…

Q: During atrial fibrillation: A. The EKG shows an exaggerated P wave. OB. There is a noticeable…

A: Human heart consists of four chambers: two atria and two ventricles. The left atria receive…

Q: Decreasing blood pressure to the Aortic Arch & Carotid Sinuses should reflexly: decrease heart rate…

A: Heart pumps blood to the systemic organs. Deoxygenated blood travels via superior and inferior vena…

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: Patient in renal failure develops hyperkalemia so that his extracellular [K+] increases from 4.5…

A: The objective of the question is to understand the effect of increased extracellular potassium…

Q: The next patient seen by the same doctor was suffering from hyperkalemia and was experiencing…

A: When the potassium level in the blood gets higher than normal then a condition arises to define that…