Principles of Anatomy and Physiology
16th Edition
ISBN: 9781119662792
Author: Tortora, Gerard J., DERRICKSON, Bryan H.
Publisher: WILEY
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Chapter 4, Problem 21CP
Why is electrical excitability important to neurons and muscle fibers?
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Chapter 4 Solutions
Principles of Anatomy and Physiology
Ch. 4 - l. Define a tissue.
Ch. 4 - What are the four basic types of human tissues?Ch. 4 - 3. Which type of cell junction prevents the...Ch. 4 - Which types of cell junctions are found in...Ch. 4 - 5. Why are epithelial and connective tissues found...Ch. 4 - Describe the various layering arrangements and...Ch. 4 - What characteristics are common to all epithelial...Ch. 4 - Checkpoint 8:
How is the structure of the...Ch. 4 - Where are endothelium and mesothelium located?Ch. 4 - Prob. 10CP
Ch. 4 - In what ways does connective tissue differ from...Ch. 4 - What are the features of the cells, ground...Ch. 4 - 13. How are connective tissues classified? List...Ch. 4 - Describe how the structure of the following...Ch. 4 - What is the difference between interstitial and...Ch. 4 - 16. Define the following kinds of membranes:...Ch. 4 - Where is each type of membrane located in the...Ch. 4 - 18. Which types of muscular tissue are striated?...Ch. 4 - Which types of muscular tissue have gap junctions?Ch. 4 - 20. What are the functions of the dendrites, cell...Ch. 4 - 21. Why is electrical excitability important to...Ch. 4 - 22. How are stromal and parenchymal repair of a...Ch. 4 - What is the importance of granulation tissue?Ch. 4 - 24. What common changes occur in epithelial and...Ch. 4 - 1. Imagine that you live 50 years in the future,...Ch. 4 - 2. You are entering a “Cutest Baby Contest” and...Ch. 4 - Prob. 3CTQ
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- In a general sense, how do skeletal muscles produce movement?arrow_forwardHow would exposure to a sarin or sarin-like chemical affect calcium levels inside the sarcoplasmic reticulum (SR) of a skeletal muscle? Group of answer choices An increased frequency of action potentials would lead to decreased calcium levels in the SR A decreased frequency of action potentials would lead to decreased calcium levels in the SR An increased frequency of action potentials would lead to increased calcium levels in the SR A decreased frequency of action potentials would lead to increased calcium levels in the SR pick one answerarrow_forwardWhich of the following step(s) about the excitation of skeletal muscle is/are incorrect? 1. Acetylcholine is released and binds to motor end plate receptors 2. An action potential is created and moves down T-tubules 3. Calcium is released from the sarcoplasmic reticulum 4. Calcium ions bind to tropomyosin to shift troponin off the binding sites for cross-bridging 5. Myosin forms cross-bridges and binds with actin to pull it towards middle of sarcomerearrow_forward
- what happens to acetylcholine to stop muscle contraction? What happens to actin when calcium is gone?arrow_forwardA) Assuming that each individual muscle fiber generates the same amount of tension, which of the following skeletal muscles will produce the greatest amount of overall tension when fully stimulated? Muscle Total Number of Muscle Fibers in Muscle A 150 B 1000 C 600 Group of answer choices Muscle A Muscle B Muscle C B)The following list of events take place during a muscle contraction. Place the events in chronological order as they relate to a muscle contraction. Calcium is released from the sarcoplasmic reticulum. Myosin heads bind to actin. An action potential arrives at the axon terminal of a motor neuron. Calcium binds to troponin, displacing tropomyosin and exposing myosin head binding sites on actin. Myosin heads undergo power stroke and actin slides over myosin towards M line of sarcomere. Acetylcholine is released at the neuromuscular junction.arrow_forwardBy what mechanism are skeletal muscles induced to relax?arrow_forward
- List the various Myofibril Structures?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_forwardWhich of the following is the smallest: muscle fiber, thick filament, or myofibril? Which is largest?arrow_forward
- How will the function of skeletal muscle tissue in your hands be affected over time when used consistently?arrow_forwardWatch this video (http://openstaxcollege.org/l/micromacro) to learn more about macro- and microstructures of skeletal muscles. (a) What are the names of the “junction points” between sarcomeres? (b) What are the names of the “subunits” within the myofibrils that run the length of skeletal muscle fibers? (c) What is the “double strand of pearls” described in the video? (d) What gives a skeletal muscle fiber its striated appearance?arrow_forwardWhat basic physiological properties do a nerve cell and a muscle cell have in common? Name a physiological property of each that the other one lacks.arrow_forward
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