Anatomy & Physiology (6th Edition)
6th Edition
ISBN: 9780134156415
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 17.5, Problem 13CYU
MAKING connections Below are drawings of three different action potentials. Two of these occur in the heart, and one occurs in skeletal muscle (as you learned in the chapter Muscles and Muscle Tissue Chapter 9)
Which one comes from a contractile cardiac muscle cell? A skeletal muscle cell? A cardiac pacemaker cell? For each one, state which ion is responsible for the depolarization phase and which ion is responsible for the repolarization phase.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Action
potential
+40
55 Threshold
Falled
initiations
Resting state
-70
Stimulus 1
Refractory
period
Time (ms)
At the peak of the action potential, which of the following are true?
Select all that apply
the membrane potential is close to but less that the K+ equilibrium potential
|voltage gated K+ channels close
voltage gated K+ channels open
the membrane potential is close to but less that the Na+ equilibrium potential
Voltage (mV)
Depolarization
Repolarization
+20
+10
t Pk; IPca", L
Self-induced
을 아
action potential
- 10
-20
-3아 1Pca, L;
Threshold
potential
-40- LPe,T
-5아
Ca
in
Pca, T;
iPNa', 4
Na*
in
-60
Slow
depolarization
(pacemaker
potential)
Time (msec)
The action potential shown here could appear in
of he heart.
O a cell of the left AV valve
a conducting cell of the right atrium
a contractile cell of the ventricles
O a contractile cell of the right atrium
Membrane potential (mV)
The next patient seen by the same doctor was suffering from hyperkalemia and
was experiencing cardiac arrhythmias. Which of the following reason/s explain/s
why this patient was experiencing cardiac arrhythmias?
O hyperkalemia leads to an increase in action potential generation because potassium
ions in the ECF makes the resting membrane potential more negative
O hyperkalemia leads to a decrease in action potential generation because the potassium
ion level in the ICF will cause hyperpolarization
O hyperkalemia leads to an increase in action potential generation because the high level
of potassium ions in the ICF will make achieving threshold easier
O a and b
Chapter 17 Solutions
Anatomy & Physiology (6th Edition)
Ch. 17.1 - The heart is in the mediastinum. Just what is the...Ch. 17.1 - From inside to outside, list the layers of the...Ch. 17.1 - What is the purpose of the serous fluid inside the...Ch. 17.2 - What is the function of the papillary muscles and...Ch. 17.2 - Prob. 5CYUCh. 17.3 - Which side of the heart acts as the pulmonary...Ch. 17.3 - Which of the following statements are true? (a)...Ch. 17.3 - Prob. 8CYUCh. 17.4 - For each of the following, state whether it...Ch. 17.5 - Cardiac muscle cannot go into tetany. Why?
Ch. 17.5 - Which part of the intrinsic conduction system...Ch. 17.5 - Describe the electrical event in the heart that...Ch. 17.5 - MAKING connections Below are drawings of three...Ch. 17.6 - The second heart sound is associated with the...Ch. 17.6 - If the mitral valve were insufficient, would you...Ch. 17.6 - During the cardiac cycle, there are two periods...Ch. 17.7 - Prob. 17CYUCh. 17.7 - What problem of cardiac output might ensue if the...Ch. 17 - When the semilunar valves are open, which of the...Ch. 17 - The portion of the intrinsic conduction system...Ch. 17 - An ECG provides information about (a) cardiac...Ch. 17 - The sequence of contraction of the heart chambers...Ch. 17 - The fact that the left ventricular wall is thicker...Ch. 17 - Prob. 6MCCh. 17 - In the heart, which of the following apply? (1)...Ch. 17 - The activity of the heart depends on intrinsic...Ch. 17 - Freshly oxygenated blood is first received by the...Ch. 17 - Describe the location and position of the heart in...Ch. 17 - Describe the pericardium and distinguish between...Ch. 17 - Trace one drop of blood from the time it enters...Ch. 17 - (a) Describe how heart contraction and relaxation...Ch. 17 - The refractory period of cardiac muscle is much...Ch. 17 - (a) Name the elements of the intrinsic conduction...Ch. 17 - Draw a normal ECG pattern. Label and explain the...Ch. 17 - Define cardiac cycle, and follow the events of one...Ch. 17 - What is cardiac output, and how is it calculated?Ch. 17 - Discuss how the Frank-Starling law of the heart...Ch. 17 - Prob. 1CCSCh. 17 - Prob. 2CCSCh. 17 - Prob. 3CCSCh. 17 - Prob. 4CCSCh. 17 - Prob. 5CCSCh. 17 - Prob. 6CCS
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
- Membrane Potential (mV) +35 0 -50 -70 0 A B C | 2 Time (milliseconds) 3 E 4 Use the figure showing phases of the action potential to answer the following question. Most of the voltage-gated sodium channels become open at label ____, and become inactivated at labelarrow_forwardThe following concentrations of Na+ and K+ ions: [Na+]o = 120 mM, [Na+]i = 6 mM,[K+]o = 2 mM, and [K+]i = 150 mM. Assuming that the further at the peak of the action potential, PK: PNa is 1 : 12. Calculate (Vm) at the peak of the action potentialarrow_forwardMatch the phases of action potential +20 -40 -60 0.8 1.6 [ Choose ] b. [ Choose] c and d V [Choose ) Depolarization phase Repolarization phase Pacemaker potentialarrow_forward
- Neurotransmitters and their respective receptors influence the propagation of action potentials. Why does ACh release at skeletal muscles cause excitation and muscle contractions whereas ACh release at the heart causes inhibition and a slowing down of the heart rate and force of heart contractions? O the ACh released at skeletal muscles and the heart are not similar skeletal muscles have more ACh receptors the properties of the ACh receptors are different a and b « Previous Nextarrow_forwardNervous Tissue electrical and chemical disequilibrium across cell membranes equilibrium potential calculating the equilibrium potential using the Nernst Equation The parameters of the Goldman Equation the reason for a -70mV resting'potential in most excitable cells gated channels particulars Defining depolarization, repolarization and hyperpolarization defining the role for the common ions, (K+, Na+ )special ions Cl, Ca+ have Define Current and ohm's law l=V/R Defining graded potentials and particulars about graded potentials such as subthreshold GP o suprathreshold GP temporal summation spatial summation e1 of 2 418 words English (United States) O Focus B I @ #3 24 & * 3 4 7 8arrow_forwardMembrane Potential (mV) The Action Potential 1. Label the significant membrane potentials and phases of the action potential in a neuron. Indicate which gates are open/closed as well as the direction of the net movement of sodium and potassium ions across the cell membrane for A-G. +30- 0 -55-B -70- -80- 0 H [T E 2 F 3 Time (ms) G 4 5arrow_forward
- Nernst (equilibrium) Potential (mV) - 6.lol 0.07 0.125 D.094 lon Intracellular Extracellular Concentration (mM) Concentration (mM) K* 155 4 Nat 12 145 Ca** 104 1.5 4 120 D) If during the generation of an action potential in the skeletal muscle cell the membrane potential approaches +65 mV, membrane permeability for which ion likely plays a major role in membrane depolarization? Explain your choice.arrow_forwardFigure 35.11 Potassium channel blockers, such as amiodarone and procainamide, which are used to treat abnormal electrical activity in the heart, called cardiac dysrhythmia, impede the movement of K+ through voltage-gated K+ channels. Which part of the action potential would you expect potassium channels to affect?arrow_forwardQUESTION 4 What is the name of the change in Vm labeled B? +40 +20 Membrane potential difference (Vm) at rest -20 Vm -40 Vm -60 -80 В -100 -120 Time (msec) Membrane potential (mV)arrow_forward
- The action potential is split into 4 parts (A-D). For each part, 1. Describe what stimulated the channel responsible for this part, 2. what is the likely ion that is moving and 3. explain which direction the ion had to move to create the measured membrane potential. +40 B D membrane potential (mV) -40 -60 A { 2 time (ms)arrow_forwardAction Refractory potential period 50 6. 50 9. 5. -10. -100 2 3 4 Time (milliseconds) 1 5 6 7 Action Potential in a Neuron Place the number from the graph that matches the description in the blank below. The voltage gated sodium channels are open. The threshold level of the neuron is represented by the number: The sodium channels have closed. The potassium channels are open and potassium ions are flowing out. The potassium channels are slow to close. The membrane potential is more negative than the resting membrane potential. Membrane Potential (mV)arrow_forwardAAAAAAAAAth Fig. 3 Membrane action potential of the squid axon. The two horizontal traces are 50 millivolts apart. The resting potential in this axon was 58 millivolts. Thus the upper hori. zontal line approximately represents zero potential difference across the membrane, the lower line the resting potential (outside positive) and the action potential, starting from the resting potential, swings to 110 millivolts (outside negative). Time intervals at the bottom are 0.2 misce. 14) The figure above is reproduced from Cole & Curtis' 1940 measurement of an action potential in the squid giant axon. Assume that these experiments were done at room temperature and the squid giant axon contains the following concentrations of Na+ and K+: Na+ inside: 10 mM, outside: 100 mM K+ inside: 300 mM, outside: 10 mM Is the measured action potential peak (110 mV) what you would expect to see? Why or why not? 10arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning
Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax
Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning
Biology (MindTap Course List)
Biology
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Cengage Learning
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Human Physiology: From Cells to Systems (MindTap ...
Biology
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Cengage Learning
Complications during Labour and Delivery; Author: FirstCry Parenting;https://www.youtube.com/watch?v=QnCviG4GpYg;License: Standard YouTube License, CC-BY