BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
3rd Edition
ISBN: 9781260670929
Author: Hoefnagels
Publisher: MCG CUSTOM
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Chapter 26, Problem 4PIT
Summary Introduction
To add:
Slow-twitch and fast-twitch muscle fibers to the concept map and differentiate between them.
Introduction:
Fibers muscles are of two types that is slow-twitch fibers and fast-twitch fibers. Different types of muscles fibers are required for different activities of a body.
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Skeletal muscle has several distinct fiber types. Type I is used primarily for aerobic activity, whereas type II b 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?
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?
If you were to watch muscle tissue contract:
Under a light microscope, would you see the muscle fibers get narrower, or the striations get thinner? Explain.
At the EM level, focusing on one sarcomere, you would be able to see a region of thick filaments overlapping two regions of thin filaments. Use the structure of the thick filaments to explain how ONE region of thick filaments is able to pull in microfilament in two opposite directions (both toward the center of the sarcomere).
Chapter 26 Solutions
BIOLOGY:THE ESSENTIALS (LL) W/CONNECT
Ch. 26.1 - How do the skeletal and muscular systems interact?Ch. 26.1 - Prob. 2MCCh. 26.1 - Prob. 3MCCh. 26.2 - Prob. 1MCCh. 26.2 - Prob. 2MCCh. 26.3 - Prob. 1MCCh. 26.3 - Prob. 2MCCh. 26.3 - Prob. 3MCCh. 26.3 - Prob. 4MCCh. 26.3 - Prob. 5MC
Ch. 26.4 - Prob. 1MCCh. 26.4 - Prob. 2MCCh. 26.4 - Prob. 3MCCh. 26.4 - Prob. 4MCCh. 26.4 - Prob. 5MCCh. 26.5 - Prob. 1MCCh. 26.5 - What happens when a muscle cell can not generate...Ch. 26.6 - Prob. 1MCCh. 26.6 - Prob. 2MCCh. 26 - Prob. 1MCQCh. 26 - Prob. 2MCQCh. 26 - Prob. 3MCQCh. 26 - Prob. 4MCQCh. 26 - Prob. 5MCQCh. 26 - Prob. 6MCQCh. 26 - Prob. 7MCQCh. 26 - Prob. 8MCQCh. 26 - Prob. 9MCQCh. 26 - Distinguish among a hydrostatic skeleton, an...Ch. 26 - Explain the observation that animals with...Ch. 26 - Prob. 3WIOCh. 26 - Prob. 4WIOCh. 26 - Prob. 5WIOCh. 26 - Prob. 6WIOCh. 26 - Prob. 7WIOCh. 26 - Prob. 8WIOCh. 26 - Prob. 9WIOCh. 26 - How might your muscles lengthen when you stretch?...Ch. 26 - How do the effects of exercise or lack thereof...Ch. 26 - Prob. 12WIOCh. 26 - Search the Internet for disorders of the skeletal...Ch. 26 - What is role of calcium in bones? In muscle...Ch. 26 - The following table shows recent mens world-record...Ch. 26 - Prob. 1SLCh. 26 - Prob. 1PITCh. 26 - Prob. 2PITCh. 26 - Prob. 3PITCh. 26 - Prob. 4PIT
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- Contractile bundles occur in nonmuscle cells; these structures are less organized than the sarcomeres of muscle cells. What is the purpose of nonmuscle contractile bundles?arrow_forwardCalmodulin 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_forwardYou know from experience that skeletal muscle tires quite quickly, especially if there is not enough oxygen. Interestingly, shellfish such as clams can maintain a month-long contraction in the muscle that keeps the shell closed. No oxygen gets in this situation. These muscles have a different version of myosin called paramyosin. Knowing what you know about the cellular mechanism of muscle contraction, propose a hypothesis to explain how paramyosin might work.arrow_forward
- Discuss the following statement: “The basal lam-ina of muscle fibers serves as a molecular bulletin board,in which adjoining cells can post messages that direct thedifferentiation and function of the underlying cells.”arrow_forwardWhy would skeletal muscle be unsuitable for the wall of the urinary bladder? Explain how this illustrates the complementarity of form and function at a cellular and molecular level.arrow_forwardSkeletal muscle cells cannot divide. How does skeletal muscle repair itself when injured?arrow_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_forwardExplain why smooth muscle of the eye is multiunit smooth muscle and the smooth muscle in the wall of digestive organs is single-unit smooth muscle.arrow_forwardMuscle cells have a number of anchor membrane?arrow_forward
- How is a muscle cell excited and why does it lead to a contraction in the muscle?arrow_forwardOne of the primary characteristics of all muscle tissue is contractility, the ability to shorten (contract) and lengthen (relax). You've identified the various components of a myofibril above. Now, use the table below to indicate what occurs to each band, line, or zone when the muscle contracts vs. relaxes. What occurs to this region / structure during contraction/relaxation? Region / Structure A-Band H-Band I-Band M-Line Z-Line Zone of Overlap Sarcomere No change Shortens Lengthens Muscle Contraction Muscle Relaxationarrow_forwardWhy does Skeletal muscle cells contain more mitochondria than other organelles?arrow_forward
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