ANATOMY+PHYSIOLOGY-PACKAGE
6th Edition
ISBN: 9780134644363
Author: Marieb
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 17, Problem 14SAQ
The refractory period of cardiac muscle is much longer than that of skeletal muscle. Why is this a desirable functional property?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
What is the significance of the extended refractory period in cardiac muscle?
How does excitation–contraction coupling in cardiac muscle resemble that of skeletal muscle? How is it different?
Explain differences between action potentials of cardiac muscle cells and those in nodal cells of the conducting system
Chapter 17 Solutions
ANATOMY+PHYSIOLOGY-PACKAGE
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
- What would be the drawback of cardiac contractions being the same duration as skeletal muscle contractions?arrow_forwardDescribe the properties of the cardiac muscle, including automaticity, excitability, conductivity, and contractility.arrow_forwardDescribe the structure of intercalated discs in cardiac musclecells, and briefly discuss their functions.arrow_forward
- Describe the arrangement of cardiac muscle fibers.arrow_forwardIn a sheet of ventricular cardiac muscle tissue, we should be able to observe electricity spreading between adjacent muscle cells (TRUE or FALSE) and from Purkinje fibers to muscle cells (TRUE or FALSE) via electrical synapses that form between the cell membranes.arrow_forwardDescribe the process of Excitation–contraction coupling in cardiac muscle?arrow_forward
- The entry of calcium into a ventricular muscle cell helps to maintain depolarization of the membrane during the plateau phase of the action potential, but this calcium also performs what other function?arrow_forwardKnowing that a patient with chronic heart failure is using digoxin (digitalis) for more than 1 year, what effect has this treatment on the distribution of ions across the membrane of cardiac muscle cells? What is effect will be of digitalis on cardiac contractility? What is an inotropic effect? How does digitalis help to treat patients with heart failure?arrow_forwardBelow are drawings of three different action potentials. Two of these occur in the heart, and one occurs in skeletal muscle. 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.arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning
Human Physiology: From Cells to Systems (MindTap ...
Biology
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Cengage Learning
The Cardiovascular System: An Overview; Author: Strong Medicine;https://www.youtube.com/watch?v=Wu18mpI_62s;License: Standard youtube license