BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 41, Problem 7U
Skeletal muscle cells are
a. large multinucleate cells that arise by growth.
b. large multinucleate cells that arise by fusion of smaller cells.
c. small cells connected by many gap junctions.
d. large cells with a single nucleus.
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Single-unit smooth muscle cells can stimulate each other because they havea. a latch-bridge.b. diffuse junctions.c. gap junctions.d. tight junctions.e. cross-bridges.
In 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)?
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Chapter 41 Solutions
BIOLOGY
Ch. 41.1 - Prob. 1LOCh. 41.1 - Prob. 2LOCh. 41.2 - Prob. 1LOCh. 41.2 - Prob. 2LOCh. 41.2 - Prob. 3LOCh. 41.3 - Prob. 1LOCh. 41.3 - Differentiate among forms of connective tissue.Ch. 41.3 - Prob. 3LOCh. 41.4 - Prob. 1LOCh. 41.4 - Prob. 2LO
Ch. 41.5 - Prob. 1LOCh. 41.5 - Prob. 2LOCh. 41.6 - Prob. 1LOCh. 41.6 - Explain the functional organization of these...Ch. 41.7 - Explain homeostasis.Ch. 41.7 - Prob. 2LOCh. 41.7 - Prob. 3LOCh. 41.8 - Prob. 1LOCh. 41.8 - Prob. 2LOCh. 41.8 - Prob. 3LOCh. 41 - Data analysis What does this graph predict about...Ch. 41 - Prob. 2DACh. 41 - Prob. 1IQCh. 41 - Epithelial tissues do all of the following except...Ch. 41 - Prob. 2UCh. 41 - Connective tissues include a diverse group of...Ch. 41 - Prob. 4UCh. 41 - Prob. 5UCh. 41 - The function of neuroglia is to a. carry messages...Ch. 41 - Skeletal muscle cells are a. large multinucleate...Ch. 41 - Connective tissues, although quite diverse in...Ch. 41 - Prob. 1ACh. 41 - Prob. 2ACh. 41 - Suppose that an alien virus arrives on Earth. This...Ch. 41 - Homeostasis a. is a dynamic process. b. describes...Ch. 41 - Prob. 5ACh. 41 - The three types of muscle all share a. a structure...Ch. 41 - Suppose that you discover a new disease that...Ch. 41 - Which organ systems are involved in regulation and...Ch. 41 - We have all experienced hunger pangs. Is hunger a...Ch. 41 - Why is homeostasis described as a dynamic process?...
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- Which component is responsible for initially stimulating a muscle contraction? a. proteins b. electrochemical signals c. plasma membranes d. striationsarrow_forwardIdentify the organelle most likely responsible for each cellular job within skeletal muscle a) Assemble myosin and actin (proteins which contract) b) Houses the genes c) Sorts any proteins produced d) ATP is generated e) Breaks down old or damaged myosin and actinarrow_forwardWhat event causes a troponin-tropomyosin complex to regain its original shape in muscle relaxation? a. stimulation of ACh receptors b. diffusion of Na+ back into transverse tubules c. return of Ca2+ into the sarcoplasmic reticulum d. breaking of the bond with tropomyosinarrow_forward
- Calmodulin is found in smooth muscle cells and performs a similar function to troponin in striated muscle fibers. However, calmodulin not only gets activated by Ca2+ but also slows the release of Ca2+ from the sarcoplasmic reticulum. How might this difference relate to the different kinds of contractions smooth muscles do in comparison to striated muscles?arrow_forwardWhich statement about the diagram is not correct??  A. All of these illustrations and photos represent muscle cells B. Illustrations "B" are skeletal muscle which we know from the striations C. The purple ovals in these illustrations are nuclei D. Illustrations "C" are smooth muscle cellsarrow_forwardWhich of the following statements correctly describes properties associated with the development of skeletal muscle cells? Check all that apply A. Skeletal muscle cell are multi nucleated cells B. Skeletal muscle cells have the capacity for repair due to the actions of myosatellite cells C. Skeletal muscle cells develop via the process of mitosis D. Skeletal muscle develop from a single myoblast cell asap pleasearrow_forward
- When Skeletal muscle contracts an arrangement of the alternating light and dark bands traversing each skeletal muscle cell changes. Which of the following statements is not correct. (Select one answer) (a) The dark A bands will remain a constant length(b) The space occupied by the H zone will not change(c) The light I bands will shorten(d) The z lines come closer together(e) The I band consists solely of thin actin filamentsarrow_forwardWhich is a false statement about skeletal muscle structure?a. A myofibril is composed of multiple muscle fibers.b. Most skeletal muscles attach to bones by connective-tissue tendons.c. Each end of a thick filament is surrounded by six thin filaments.d. A cross-bridge is a portion of the myosin molecule.e. Thin filaments contain actin, tropomyosin, and troponin.arrow_forwardIn an examination of a sample of muscle tissue, you notice that thesample consists of striated cells with multiple nuclei in each cell.This suggests that the sample is from which of the following typesof muscle?a. cardiac c. skeletalb. smooth d. Both b and c are correct.arrow_forward
- When sarcomeres contract during muscle contraction, which of the following occurs? A. The myosin filaments lengthen. B. The myosin filaments "walk" along the actin microfilaments. C. The myosin filaments shorten. D. The actin filaments shorten.arrow_forwardIf a muscle cell’s sarcoplasmic reticulum had little to no Ca2+, could the muscle cell still produce an electrical impulse, and would the muscle cell still contract? Explain.arrow_forwardStriations are found in the cytoplasm of which type(s) of muscle tissue? Select all that apply. A. Skeletal muscle B. Cardiac muscle C. Smooth musclearrow_forward
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