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Muscle Tissue Characteristics Quiz
48 Questions
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Muscle Tissue Characteristics Quiz

Created by
@KeenMaxwell9176

Questions and Answers

What is the most distinguishing characteristic of muscle tissue?

the ability to transform chemical energy into mechanical energy to move the body

Which of the following are correctly paired?

  • Cardiac muscle; involuntary control (correct)
  • Smooth muscle; voluntary control
  • Skeletal muscle; voluntary control (correct)
  • Skeletal muscle; involuntary control

    • Which type of muscle requires voluntary nervous stimulation for activation?

    skeletal

    Which term best identifies a muscle cell?

    <p>muscle fiber</p> Signup and view all the answers

    Cells with the ability to change their membrane potential have what property?

    <p>excitability</p> Signup and view all the answers

    Which of the following proteins is most associated with the characteristics of extensibility?

    <p>elastic (titin) filaments</p> Signup and view all the answers

    Why does skeletal muscle store glycogen?

    <p>skeletal muscle is a heavy consumer of energy</p> Signup and view all the answers

    Muscle tissue has all of the following properties except ________.

    <p>secretion</p> Signup and view all the answers

    Which of the following is NOT a normal function of muscle tissue?

    <p>secreting hormones</p> Signup and view all the answers

    Which of the following statements is true?

    <p>Skeletal muscle cells are long and cylindrical with many nuclei</p> Signup and view all the answers

    One of the important functions of skeletal muscle contraction is production of heat.

    <p>True</p> Signup and view all the answers

    Which structure corresponds to a single skeletal muscle cell?

    <p>C</p> Signup and view all the answers

    The connective tissue that covers structure A is continuous with which of the following?

    <p>tendon</p> Signup and view all the answers

    Which of the following corresponds to a single fascicle?

    <p>B</p> Signup and view all the answers

    Which of the structures is surrounded by the connective tissue sheath known as the perimysium?

    <p>B</p> Signup and view all the answers

    In the muscles of the limbs, the origin is usually the immobile muscle attachment.

    <p>True</p> Signup and view all the answers

    Which of the following surrounds the individual muscle cell?

    <p>endomysium</p> Signup and view all the answers

    During development, embryonic cells will fuse to form muscle fibers. This will result in ________.

    <p>multinucleated muscle fibers that can extend as long as 30 centimeters</p> Signup and view all the answers

    A sarcomere is the distance between two Z discs ________

    <p>Z discs</p> Signup and view all the answers

    The ______ contains only the actin filaments.

    <p>I band</p> Signup and view all the answers

    The thicker filaments are the _________ filaments.

    <p>myosin</p> Signup and view all the answers

    Both actin and myosin are found in the __________.

    <p>A band</p> Signup and view all the answers

    The myosin filaments are located in the __________.

    <p>A band</p> Signup and view all the answers

    What is the functional unit of a skeletal muscle called?

    <p>a sarcomere</p> Signup and view all the answers

    Myoglobin __________.

    <p>stores oxygen in muscle cells</p> Signup and view all the answers

    Approximately 80% of a muscle fiber's volume are the myofibrils. This characteristic reflects muscles' ability to ________.

    <p>produce movement through contractile force</p> Signup and view all the answers

    The contractile, or functional, unit of a muscle fiber is __________.

    <p>the sarcomere</p> Signup and view all the answers

    The contractile units of skeletal muscles are ________.

    <p>myofibrils</p> Signup and view all the answers

    What is the function of the filaments found in ranges 1-2 and 6-7 but no other ranges?

    <p>protection from overstretching</p> Signup and view all the answers

    The smallest contractile unit within skeletal muscle would correspond to the distance between which two points in the figure?

    <p>1 and 7</p> Signup and view all the answers

    Which of the following regions best identifies where myosin would have maximum cross-bridge access to actin?

    <p>the region between 2 and 3</p> Signup and view all the answers

    The region between which two points corresponds to the entire A (dark) band?

    <p>2 and 6</p> Signup and view all the answers

    What is the role of tropomyosin in skeletal muscles?

    <p>Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules</p> Signup and view all the answers

    What level of structural organization do voltage-gate sodium channels in muscle represent?

    <p>molecule</p> Signup and view all the answers

    What would happen if a disorder existed that caused a person to produce no tropomyosin?

    <p>the muscle tissues would never be able to relax</p> Signup and view all the answers

    Which organelle can chemically regulate the shortening of the muscle?

    <p>the sarcoplasmic reticulum</p> Signup and view all the answers

    What structure in skeletal muscle cells functions in calcium storage?

    <p>sarcoplasmic reticulum</p> Signup and view all the answers

    An increase in the calcium ion level in the sarcoplasm starts the sliding of the thin filaments. When the level of calcium ions declines, sliding stops.

    <p>True</p> Signup and view all the answers

    What is the functional role of the T tubules?

    <p>enhance cellular communication during muscle contraction</p> Signup and view all the answers

    The __________ shorten(s) during muscle contraction.

    <p>sarcomere</p> Signup and view all the answers

    The sliding filament model of contraction states that __________.

    <p>during contraction, the thin myofilaments slide past the thick myofilaments so that the actin and myosin myofilaments overlap to a greater degree</p> Signup and view all the answers

    During muscle contraction, myosin cross bridges attach to which active sites?

    <p>actin filaments</p> Signup and view all the answers

    The sliding filament model of contraction involves ________.

    <p>actin and myosin sliding past each other and partially overlapping</p> Signup and view all the answers

    When a muscle fiber contracts, the I bands diminish in size, the H zones disappear, and the A bands move closer together but do not diminish in length.

    <p>True</p> Signup and view all the answers

    A muscle fiber represents which organizational level of anatomy?

    <p>cellular level</p> Signup and view all the answers

    Myofilaments represent which organizational level of anatomy?

    <p>chemical level</p> Signup and view all the answers

    Which membrane surrounds the others?

    <p>epimysium</p> Signup and view all the answers

    Which description is most appropriate for a myofibril?

    <p>a single long, thin organelle containing many proteins</p> Signup and view all the answers

    Study Notes

    Muscle Tissue Characteristics

    • Distinguished by its ability to convert chemical energy into mechanical energy for body movement.
    • Skeletal muscle is under voluntary control, differentiating it from other muscle types.

    Muscle Activation

    • Skeletal muscles require voluntary nervous stimulation via the nervous system to contract.
    • Neuromuscular junction is where nerve fibers communicate with muscle fibers to initiate contraction.

    Muscle Cell Structure

    • Muscle cells are referred to as muscle fibers; they are multinucleated due to fusion during development.
    • Excitability refers to muscle cells' ability to respond to stimuli, allowing for contraction.

    Muscle Properties

    • Elastic (titin) filaments are associated with extensibility of muscle tissue.
    • Skeletal muscle acts as a high energy consumer, storing glycogen for energy needs.
    • Muscle tissue lacks the ability to secrete hormones, distinguishing it from endocrine functions.

    Muscle Fiber Composition

    • Skeletal muscle cells are long, cylindrical, and multinucleated.
    • Myoglobin within muscle fibers stores oxygen for energy production.

    Muscle Filament Structure

    • Sarcomeres are defined as the distance between two Z discs and are the functional units of muscle fibers.
    • The I band contains only actin filaments, while myosin filaments are found in the A band.
    • The A band corresponds to the region containing both actin and myosin filaments.

    Contractile Mechanisms

    • Sarcomeres shorten during muscle contraction as actin slides over myosin, with Z lines moving closer together.
    • The sliding filament model explains how contraction occurs as thin filaments slide past thick filaments, enhancing overlap during muscle activity.

    Structural Organization

    • Muscle fibers represent the cellular level of anatomical organization.
    • Myofibrils, which are units within muscle fibers, represent the chemical level of organization.
    • The epimysium is the outer layer surrounding muscle tissue, indicating the highest structural organization.

    Calcium and Muscle Function

    • The sarcoplasmic reticulum stores calcium ions, which play a crucial role in initiating muscle contraction.
    • Increased calcium levels in the sarcoplasm begin the sliding process of muscle contraction; a decrease halts it.

    Communication and Muscle Contraction

    • T tubules enhance cellular communication during contraction by transmitting signals deeper into the muscle fiber.
    • Muscle contraction also generates heat, highlighting another essential function of skeletal muscle.

    Unique Muscle Filament Features

    • Tropomyosin inhibits contraction by blocking myosin binding sites on actin, preventing muscle fatigue.
    • Without tropomyosin, muscles cannot relax as myosin binding sites remain accessible, leading to sustained tension.

    Muscle Fiber Characteristics

    • Muscle fibers can extend significantly, with some measuring up to 30 centimeters.
    • Myofilaments, key components of muscle contractions, include both thick (myosin) and thin (actin) filaments for functional action.

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    Description

    Dive into the fascinating world of muscle tissue with this quiz that covers muscle characteristics, activation, and properties. Test your understanding of how skeletal muscles function and their unique features, including their energy consumption and cell structure.

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