LAB MANUAL FOR HUMAN A&P MAIN VERSION
4th Edition
ISBN: 9781266871016
Author: Martin
Publisher: MCG
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Textbook Question
Chapter 20, Problem 2.1CT
When stimulated to contract, the sarcomeres shorten
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Skeletal muscle is described as striated. What are the lighter, thinner stripes noted under the microscope?
Group of answer choices
troponin
actin
myosin
dystrophin
Rather than innervating individual muscle fibers, motor neurons often innervate two or more muscle fibers. The motor neuron and the muscle fibers it innervates are together called a:
Group of answer choices
motor unit
myofibril
muscle fascicle
motor fascia
Fast glycolytic muscle fibers allow for relatively quick ATP energy production by splitting glucose (but eventually leads to fatigue), a process described as:
Group of answer choices
fermentation
aerobic pathway
anaerobic pathway
ATP reserve use
One 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 Relaxation
Distinguish between skeletal, smooth, and cardiac muscle in terms of location and whether they have sarcomeres.
Use the sliding filament model to draw how thin filaments, thick filaments, and Z lines move during muscle contraction.
Predict how perturbations of acetylcholine release, reception, or breakdown will influence muscle contraction.
Predict how perturbations of actin, troponin, tropomyosin, myosin, or calcium would influence muscle contraction.
Distinguish between the sympathetic and parasympathetic nervous system.
Predict how changes in stress levels or situations would affect activation of the sympathetic and parasympathetic nervous system, levels of epinephrine and norepinephrine, and blood pressure.
Chapter 20 Solutions
LAB MANUAL FOR HUMAN A&P MAIN VERSION
Ch. 20 - The outermost layer of connective tissue of a...Ch. 20 - The thick myofibril filament of a sarcomere is...Ch. 20 - The muscle primarily responsible for an action is...Ch. 20 - The neuron and the muscle fibers it innervates is...Ch. 20 - The functional contractile unit of a muscle fiber...Ch. 20 - Prob. 6PLCh. 20 - A synergistic muscle contraction assists the...Ch. 20 - The plasma membrane of a muscle fiber (cell) is...Ch. 20 - Match the terms in column A with the definitions...Ch. 20 - FIGURE 20.7 Label this transmission electron...
Ch. 20 - When stimulated to contract, the sarcomeres...Ch. 20 - Prob. 3.1ACh. 20 - The ____________ of a muscle is attached to a more...Ch. 20 - A muscle responsible for most of an action is...Ch. 20 - Assisting muscles of an agonist are called...Ch. 20 - Antagonists are muscles that resist the actions...Ch. 20 - When the forearm is extended at the elbow joint,...Ch. 20 - When the biceps brachii acts as the agonist, the...Ch. 20 - A _____________ is a synergistic muscle that will...
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- Figure 38.37 Which of the following statements about muscle contraction is true? The power stroke occurs when ATP is hydrolyzed to ADP and phosphate. The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.arrow_forwardWhat is the function of the sarcoplasmic reticulum in muscle cell contraction?arrow_forwardThank youarrow_forward
- A) 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_forwardIndicate which of the following are true. Chronically shortened muscles will lose sarcomeres in series in order to maintain ideal amounts of myofilament overlap. Contractile force is proportional to the length of a muscle. Muscle organ contraction is all or nothing. Muscle cells are surrounded by an endomysium. Actin is the thick filament and Z-lines are where the cross-bridges zig-zag to adjacent actin filaments. Muscles with fewer motor units are weaker, i.e., capable of less force. A nerve impulse, calcium, and ATP are necessary for muscle contraction. Tendons attach bones to bones and help to limit the range of motion at joints. Muscle tissue is very dynamic and will respond to chronic stress by becoming stronger (making more myofilaments), chronic contraction by becoming shorter (losing sarcomeres in series), and stretching by becoming longer (adding sarcomeres in series). Myofilaments are actually long strands of proteins.arrow_forwardDescribe the protein structures involved in muscle contraction. Illustratearrow_forward
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