Which of these conditions results the unstable resting membrane potential seen in pacemaker cells? ANa+ ions move into the cell through specialized Na+ ion channels. BMembrane permeability to K+ ions increases. CVoltage-gated Ca2+ ion channels close. DAll of these are correct.

The membrane potential is also termed transmembrane potential or membrane voltage. It is the…

Answered: Which of these conditions results the…

Science

Biology

Which of these conditions results the unstable resting membrane potential seen in pacemaker cells?

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter9: Cardiac Physiology

Section9.2: Electrical Activity Of The Heart

Problem 1CYU

See similar textbooks

Related questions

Q: The AV node delay: a. allows the atria and ventricles to depolarize and contract as a unit. b.…

A: The human heart consists of the left and right atria and the left and right ventricles. The heart…

Q: An ECG measures a. changes in electrical potential during the cardiac cycle. b. Ca2+…

A: Introduction: ECG or electrocardiogram is a machine that helps analyse the condition of the heart.…

Q: What happens to preload when there is venousconstriction in the veins?a. It increases.b. It…

A: The heart is a muscular organ in most animals. It pumps blood through the blood vessels of the…

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: A chemical called EDTA, like citrate, binds to (or “chelates”) Ca2+. Suppose a person had EDTA…

A: Blood circulates under pressure through the vasculature. Following vascular injury, escaping blood…

Q: In pacemaker cells the movement of __________ into the cell through voltage-gated channels is…

A: The opening of channels that let positive ions flow into the cell can cause depolarization. Flow of…

Q: Cardiac output cannot increase indefinitely because (a) available filling time becomes shorter as…

A: The circulatory system is a blood vessels network that delivers blood to body's every part. Blood…

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: In a healthy young adult, what happens to cardiacoutput when heart rate increases above 160 bpm?a.…

A: Cardiac output is also known as heart output. It describes the amount of blood being pumped by the…

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

Q: Platelets a. form a plug by sticking to each other. b. release chemicals that stimulate…

A: They are involved in the removal of waste products from the body. It has three components: blood,…

Q: Which of the following conditions might result in the back flow of blood through a weakened mitral…

A: a. High pressure in the left ventricle, low pressure in the left atrium

Q: This diagram shows a _______ and the green things being released into the space are _____. A.…

A: The branch of biology associated with studying the functions of living organisms’ body can be…

Q: nodal delay a. maintains cardiac output by allowing enough ventricular filling. b. prevents…

A: The AV node is a highly specialized conducting tissue that slows the impulse conduction considerably…

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: P is the pressure exerted AV is the change in the volume During each heartbeat in the resting…

A: Given information The work done by the heart = work done by left ventricle + work done by right…

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: a) Find the systolic and diastolic pressures. b) Find the amplitude of the graph. c) Find the pulse…

A: The upper limit of the curve is the Systolic Pressure and the lower limit is the Diastolic Pressure.…

Q: If we surgically innervated the SA node with lower motor neurons and stimulated the lower motor…

A: The SA (sinoatrial) node is considered the pacemaker of the heart, as it initiates an action…

Q: A circulatory pathway in which the blood flows through two capillary beds in series - before it…

A: The circulatory pathways direct proper flow of blood through heart, lungs, and various associated…

Q: Acclimatization at high altitude would include a.increased in contractility of heart and increased…

A: Acclimatization, also known as acclimation or acclimatisation, is the process by which an individual…

Q: Which point on the PV loop corresponds to the opening and closing, respectively of the aortic valve?…

A: Introduction : PV loop derived from pressure and volume data found from cardiac cycle. If left…

Q: Hearts of mammals are described to have double pump structure. Which choice explains the functional…

A: There are four chambers in the heart of mammals- two auricles and two ventricles.

Q: Which is a clotting pathway system? Group of answer choices a.None b.Extrinsic system c. Both are…

A: Blood coagulation refers to the process of forming a clot to stop bleeding. To stop bleeding, the…

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: Compared with the interstitial fluid that bathes active musclecells, blood reaching these cells in…

A: One of the defined components of the extracellular fluid apart from the transcellular fluid that…

Q: Which is not true about our heart A. ventricular systole squeezes blood to the lungs and the body B.…

A: Heart is a muscular organ that helps puno blood to different body organs. It has four chambers,…

Q: An ectopic pacemaker refers to the condition in which _____. A the rate at which the SA node…

A: An ectopic pacemaker refers to the condition in which the rate at which the SA node cells undergo…

Q: The endocardium is composed of __________. A collagen fibers and the lumen B myocardiocytes…

A: The Human heart is the Center for regulating blood across the body. It is located within the…

Q: Which of the following statements is true about the SA (sinoatrial) node? a. The action potential…

A: The sinoatrial node ( SA node ) is a group of cells located in the wall of the right atrium of the…

Q: What occurs during the atrial reflex? a. Atria slow their filling rate. b. There is a decrease in…

A: Answer is d.) an increase in heart rate occurs in response to an increase in blood volume within the…

Q: A patient has been in a serious car accident and is hemorrhaging. Which of the following changes…

A: The heart is a muscular, mesodermally derived organ. It pumps the blood and circulates it in the…

Q: Given: Capillaries are where the magic of gas diffusion happens. Capillaries are approximately 5-10…

A: The smallest unit of the blood vessels that convey blood between arteries and veins are known as…

Q: In a healthy heart during exercise, cardiac output increases as heart rate increases up to about…

A: CO (Cardiac output) is the estimation of the volume of blood pumped by the ventricles in a minute.…

Q: The advantage of having a heart with two atria is that a) oxygenated and deoxygenated blood are…

A: The human heart has 4 chambers : Left atrium Right atrium Left ventricle Right ventricle The…

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: Which statement about the normal electrocardiogram (ECG) tracing is false? A The T wave…

A: The heart is depolarized at every beat to trigger its contraction. This electrical activity is…

Q: Which statement about atrial contraction is true. A the end diastolic volume is the volume of…

A: Atrium is the upper chamber through which entry of blood occurs in ventricles of heart.There are two…

Q: One difference between the semilunar valves and the atrioventricular valves is that only the…

A: The valves that are found between the atria and ventricles are termed as atrioventricular valves,…

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

A: Depolarization means contraction of cardiac musculature and repolarization means resting state…

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 these events occurs during (ventricular) systole? A)Only the left ventricle contracts.…

A: Diastole and systole are two phases of the cardiac cycle. Systole occurs when the heart contracts to…

Q: At what point is the pressure in the ventricles increasing most rapidly? A when both sets of…

A: The measurement of the blood pressure in the ventricles of the heart is known as ventricular…

Q: Repolarization of the ventricles typically _______. A begins at the end of the T-wave and…

A: Electrocardiograms also called ECGs or EKGs is a simple diagnostic machine that checks 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…

Q: 22. Ventricular Contractility increases in response to circulating Epinephrine. What factor is…

A: As you have posted multiple questions, only the first 3 questions i.e questions 23, 24, 25 will be…

Concept explainers

Sleep Physiology

Sleep is a condition of reduced muscle movement in the body. Awareness about the surroundings is reduced at the time of sleep. The body stays mildly responsive or non-responsive to external stimuli. The sleep-wake cycle is controlled by the circadian rhythm that produces a resting phase for the body.

Question

Which of these conditions results the unstable resting membrane potential seen in pacemaker cells?

	A	Na+ ions move into the cell through specialized Na+ ion channels.
	B	Membrane permeability to K+ ions increases.
	C	Voltage-gated Ca2+ ion channels close.
	D	All of these are correct.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

Step 2

Step 3

Step 4

Trending now

This is a popular solution!

Step by step

Solved in 4 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.

Similar questions

Heavy smokers often develop abnormally high blood pressure. The nicotine in tobacco is a potent vasoconstrictor. Explain the connection between these two facts, including what kind of blood vessels are likely affected.
In the systemic circuit, the hearts _______ half pumps blood to all body regions; then blood flows to the heart. a. left; deoxygenated; oxygenated b. right; deoxygenated; oxygenated c. left; oxygenated; deoxygenated d. right; oxygenated; deoxygenated
Which of these conditions occurs in the repolarization phase of an action potential in pacemaker cells? A voltage-gated Ca2+ ion channels are open B voltage-gated K+ ion channels are open C voltage-gated Na+ ion channels are open D all of these
In pacemaker cells the movement of __________ into the cell through voltage-gated channels is primarily responsible for the depolarization phase of the action potential. A Ca2+ ions B K+ ions C Na+ ions D Cl- ions
The ramp potential of pacemaker cells is caused by the opening of the: The ramp potential of pacemaker cells is caused by the opening of the: A. HCN channels B. voltage-gated sodium channels C. voltage-gated calcium channels D. voltage-gated potassium channels
Nodal (conductile) cells in the heart differ from other myocardiocytes (contractile cells) in that nodal cells have_____. A channels that allow Na+ to slowly leak in between action potentials B gap junctions while other myocardiocytes do not C more rapid depolarization in their action potentials due to voltage-gated Na+ channels D action potentials without plateau phases because they lack Ca+2 channels
Describe the movement in ions in action potentials of these cells - pacemaker cell - cardiac contractile cell
In the myogenic response, ________.a. muscle contraction promotes venous return to theheartb. ventricular contraction strength is decreasedc. vascular smooth muscle responds to stretchd. endothelins dilate muscular arteries
In the following graphs of pacemaker potential recordings from the SA node, what graph represents what (ie parasympathetic nerve effect)
Which of these accounts for the similarity between the P wave duration and the QRS complex duration despite the ventricle being much larger than the atria? Group of answer choices The His-Purkinje system has a faster conduction velocity than the atrial system The atria contain the same volume of blood as the ventricles Gravity increases the ventricular conduction velocity The rate of phase 4 depolarization is similar in all the conducting cells of the heart
The effective-refractory period present during Phase 2 of the actionpotential of ventricular myocytes:A)is relatively long because the Na+ current does not inactivate. B) is relatively long because K+ current is immediately activated once membrane potential becomes positive. C) prevents tetanus in the heart. D) is about twice as long as in skeletal muscle
why are cardiac muscle cells affected by hyperkalemia? A. All choices below are correct B. Resting membrane potential becomes less negative C. Voltage across the cardiac muscle cell cannot be maintained D. The cardiac muscle cell cannot respond to a nerve stimulus