Human Anatomy (9th Edition)
9th Edition
ISBN: 9780134320762
Author: Frederic H. Martini, Robert B. Tallitsch, Judi L. Nath
Publisher: PEARSON
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Chapter 21, Problem 13RFT
Which of the following is not true of intercalated discs?
(a) They provide additional strength from cells bound together by tight junctions.
(b) They have a smooth junction between the plasma membrnaes of apposed muscle cells.
(c) Myofibrils of the interlocking muscle fibers are anchored at the membrane.
(d) The cardiac muscle fibers at the intercalated discs are connected by gap junctions.
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Intercalated discs and pacemaker cells are characteristic of (a) smooth muscle tissue. (b) cardiac muscle tissue. (c) skeletal muscle tissue. (d) a, b, and c are correct.
2) List the names of the two major Contractile Proteins. Which of the proteins is "bound" and "anchored" to the cell membrane? The other protein essentially "floats" within the ctyoplasm; which contractile protein "floats".
3) Contractions in a muscle cell (or fiber) is always stimulated and intiated by a rapid rise in intrallcellular calcium. Write a brief paragraph or two explaining the differences in the sources of Contraction- causing-Calcium within the 3 different muscle-cell types.
Given these events:(1) The sarcoplasmic reticulum releases Ca2+.(2) The sarcoplasmic reticulum takes up Ca2+.(3) Calcium ions diffuse into the sarcoplasm.(4) An action potential moves down the T tubule.(5) The sarcomere shortens.(6) The muscle relaxes.Choose the arrangement that lists the events in the order they occurfollowing a single stimulation of a skeletal muscle fiber.a. 1,3,4,5,2,6 c. 4,1,3,5,2,6 e. 5,1,4,3,2,6b. 2,3,5,4,6,1 d. 4,2,3,5,1,6
Chapter 21 Solutions
Human Anatomy (9th Edition)
Ch. 21 - Match each numbered item with the most closely...Ch. 21 - Prob. 2RFTCh. 21 - Prob. 3RFTCh. 21 - Prob. 4RFTCh. 21 - Prob. 5RFTCh. 21 - Match each numbered item with the most closely...Ch. 21 - Prob. 7RFTCh. 21 - Prob. 8RFTCh. 21 - Prob. 9RFTCh. 21 - Match each numbered item with the most closely...
Ch. 21 - The potential space between the parietal and...Ch. 21 - Prob. 12RFTCh. 21 - Which of the following is not true of intercalated...Ch. 21 - Prob. 14RFTCh. 21 - The pacemaker cells of the heart are located in...Ch. 21 - Prob. 16RFTCh. 21 - Prob. 1RCCh. 21 - If the papillary muscles fail to contract, (a)...Ch. 21 - Prob. 3RCCh. 21 - Prob. 4RCCh. 21 - Prob. 5RCCh. 21 - Define a pacemaker cell, and list the group of...Ch. 21 - Prob. 7RCCh. 21 - Prob. 8RCCh. 21 - Why are nodal cells unique? What is their...Ch. 21 - Prob. 10RCCh. 21 - Prob. 1CTCh. 21 - 2. Lee is brought to the emergency room suffering...Ch. 21 - Prob. 3CT
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- Skeletal muscle has several distinct fiber types. Type I is used primarily for aerobic activity, whereas type IIb is specialized for short, intense bursts of activity. How could you distinguish between these types of muscle fiber if you viewed them with an electron microscope?arrow_forwardIn muscle cells, magnesium ions compete with calcium ions for binding sites on troponin molecules. If a person has too high a concentration of magnesium ions in the blood, magnesium ions can prevent calcium ions from binding troponin. A) What effect would this have on muscle contraction (strengthen, weaken, or no effect)? B) Use your knowledge of how muscle fibers contract to explain your answer in part A.arrow_forwardIn 2013, Zach Bitter set a new record for running a 100 mile Ultra-Marathon in less than 12 hours. (Holy smokes!!!) If we were to look at the composition of his skeletal muscles (particularly in his legs), we would likely find a greater proportion of: A)Type I Fibers b)Type IIX Fibers Creatine phosphate can supply the phosphate for conversion of ADP into ATP. The enzyme needed for this to occur is: A)creatine kinase B)creatine hydrolase C)adenylate cyclase D)adenylate phosphatasearrow_forward
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