Muscle Tissue Types Overview
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Muscle Tissue Types Overview

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Questions and Answers

What is a defining characteristic of skeletal muscle tissue?

  • Multinucleate cells (correct)
  • Involuntary control
  • Uninucleate cells
  • Branching cells

    • Which function is associated with cardiac muscle tissue?

  • Voluntary movement
  • Pumping blood into circulation (correct)
  • Facial expression
  • Locomotion

    • Where is cardiac muscle primarily located?

  • In the walls of the lungs
  • In the skin
  • In skeletal muscles attached to bones
  • In the walls of the heart (correct)

    • Which of the following best describes the microscopic observation of cardiac muscle?

    <p>Presence of intercalated discs</p> Signup and view all the answers

    Which trait distinguishes smooth muscle from both skeletal and cardiac muscle?

    <p>Involuntary control</p> Signup and view all the answers

    Which characteristic is unique to cardiac muscle compared to skeletal and smooth muscle?

    <p>Branched cells</p> Signup and view all the answers

    Which of the following muscle types propels food and is located in the walls of hollow organs?

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

    What is the primary function of skeletal muscle?

    <p>Facilitates body movement</p> Signup and view all the answers

    Which statement correctly describes the control of smooth muscle?

    <p>Under involuntary control</p> Signup and view all the answers

    Which muscle type would you expect to find in the heart?

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

    What is the primary characteristic of the nuclei in smooth muscle cells?

    <p>Nuclei are central and singular</p> Signup and view all the answers

    Which feature distinguishes smooth muscle tissue from skeletal muscle?

    <p>Tapered ends of the muscle cells</p> Signup and view all the answers

    How are smooth muscle cells arranged within the tissue?

    <p>In closely packed sheets</p> Signup and view all the answers

    What is a primary function of smooth muscle tissue?

    <p>Propelling substances along internal passageways</p> Signup and view all the answers

    Where is smooth muscle tissue predominantly located in the body?

    <p>In the walls of hollow organs</p> Signup and view all the answers

    Which statement accurately describes cardiac muscle?

    <p>It has intercalated discs and contracts without conscious control.</p> Signup and view all the answers

    What is true regarding smooth muscle cells?

    <p>They are spindle-shaped and help in peristalsis.</p> Signup and view all the answers

    Which of the following best describes striations in muscle tissue?

    <p>They are formed by the arrangement of protein filaments in cardiac and skeletal muscle.</p> Signup and view all the answers

    How does skeletal muscle primarily differ from cardiac and smooth muscle?

    <p>It is striated and under voluntary control to move the skeleton.</p> Signup and view all the answers

    What distinguishes involuntary muscle from voluntary muscle?

    <p>Involuntary muscle operates without conscious control, while voluntary muscle does.</p> Signup and view all the answers

    Which muscle is primarily responsible for elevating the mandible during chewing?

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

    Which muscle functions to close the eyelids?

    <p>Orbicularis oculi</p> Signup and view all the answers

    What is the main action of the buccinator muscle?

    <p>Compression of the cheeks</p> Signup and view all the answers

    Which of the following muscles is located at the back of the neck and assists in head extension?

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

    Which muscle is NOT involved in facial expression?

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

    What is the primary action of the orbicularis oris muscle?

    <p>Closes and protrudes lips</p> Signup and view all the answers

    Which muscle is responsible for depressing the lower lip?

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

    Which of the following muscles originates from the occipital bone?

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

    Identify the muscle associated with the action of elevating and protracting the mandible.

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

    Which muscle's insertion point is the lower edge of the mandible?

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

    What is the primary purpose of studying antagonistic muscle arrangements?

    <p>To understand the function and interaction of opposing muscles</p> Signup and view all the answers

    Which of the following is essential for accurately identifying muscles using models and charts?

    <p>Knowledge of muscle-related terms and their meanings</p> Signup and view all the answers

    What task involves both examining and labeling diagrams of a whole muscle?

    <p>Completing a lab report by comparing labeled and unlabeled diagrams</p> Signup and view all the answers

    Which action should be taken to begin studying the musculature of the human head?

    <p>Obtain a model to study muscular arrangements</p> Signup and view all the answers

    Why is it important to label an unlabeled diagram of a whole muscle?

    <p>To test the accuracy of memory recall regarding muscle structures</p> Signup and view all the answers

    Which muscle is responsible for flexing the leg at the knee while also extending the thigh?

    <p>Biceps femoris</p> Signup and view all the answers

    Which muscle's origin is located on the pubis and is primarily involved in thigh adduction?

    <p>Adductor longus</p> Signup and view all the answers

    Identify the muscle that extends the leg at the knee and has its origin on the ilium.

    <p>Rectus femoris</p> Signup and view all the answers

    What action is primarily performed by the tibialis anterior muscle?

    <p>Dorsiflexion and inversion of the foot</p> Signup and view all the answers

    Which muscle inserts into the calcaneus via the Achilles tendon and functions to plantar flex the foot?

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

    Which term refers to the movement of a bone toward the midline?

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

    What structure surrounds and binds together individual muscle fibers within a fascicle?

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

    What is the role of the antagonist muscle pair in movement?

    <p>One muscle contracts while the other remains relaxed to facilitate movement.</p> Signup and view all the answers

    What action is described as increasing the angle at a joint?

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

    What is the primary action of the muscles located in the posterior compartment of the arm?

    <p>Extends elbow</p> Signup and view all the answers

    Which term accurately describes the action of turning the palm upward?

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

    Which nerve innervates the flexors of the forearm?

    <p>Median or ulnar nerve</p> Signup and view all the answers

    Which compartment of the forearm is responsible for extending the wrist and fingers?

    <p>Posterior compartment</p> Signup and view all the answers

    What is the action of the muscles found in the anterior compartment of the arm?

    <p>Flexes elbow</p> Signup and view all the answers

    Which of the following correctly classifies the biceps brachii?

    <p>Flexor muscle of the arm</p> Signup and view all the answers

    Study Notes

    Muscle Tissue Types

    • Skeletal Muscle: Long, cylindrical cells, multinucleate, striations present. Function: Voluntary movement, locomotion, manipulation of the environment, facial expression. Location: Attached to bones or skin.
    • Cardiac Muscle: Branching cells, uni/binucleate, striations present. Function: Contraction, propels blood into circulation. Location: Heart. Control: Involuntary.
    • Smooth Muscle: Spindle-shaped cells, single central nucleus, striations absent. Function: Propels food, urine, feces; walls of hollow organs. Location: Walls of hollow organs. Control: Involuntary.

    Skeletal Muscle Details

    • Microscopic Examination: Long, unbranching, multinucleated fibers with prominent striations.

    Cardiac Muscle Details

    • Microscopic Examination: Branching, striated cells with intercalated discs that appear as transverse lines between the muscle fibers.

    Smooth Muscle Details

    • Microscopic Examination: Tapered ends, no striations or intercalated discs.
    • Arrangement: Cells arranged closely to form sheets.
    • Nuclei: Central nuclei.

    Muscle Terminology

    • Cardiac muscle: The myocardium, the muscle of the heart.
    • Intercalated discs: Junctions between adjacent cardiac muscle cells.
    • Involuntary muscle: Muscle that contracts without conscious control (smooth and cardiac muscles).
    • Skeletal muscle: Striated muscle tissue that attaches to the skeleton and moves it. It is under voluntary control.
    • Smooth muscle: Involuntary, non-striated, spindle-shaped muscle cells. They are found in blood vessel walls and the walls of the gut and urinary tract and are responsible for peristalsis.
    • Striations: Stripes visible in cardiac and skeletal muscle cells. They are due to the arrangement of protein filaments within the cells.
    • Voluntary muscle: Muscle under conscious control; skeletal muscle.

    Muscle Action Terminology

    • Abduction: Moves a bone away from the midline.
    • Adduction: Moves a bone toward the midline.
    • Dorsiflexion: Points toes upward.
    • Eversion: Turns sole outward.
    • Extension: Increases the angle at a joint.
    • Flexion: Decreases the angle at a joint.
    • Inversion: Turns sole inward.
    • Plantar Flexion: Points toes downward.
    • Pronation: Turns palm downward.
    • Protraction: Moves a part forward (usually mandible).
    • Retraction: Moves a part backward (usually mandible).
    • Rotation: Causes a part to pivot upon its axis.
    • Supination: Turns palm upward.

    Miscellaneous Muscle Terms

    • Antagonistic muscle pair: Two muscles that have opposite actions (e.g., biceps and triceps of the arm).
    • Aponeurosis: A sheet of dense fibrous connective tissue linking a muscle to the part it moves.
    • Endomysium: Thin connective tissue surrounding each muscle cell.
    • Epimysium: Connective tissue that surrounds the whole muscle.
    • Fascicle: A bundle of muscle fibers bound together by connective tissue.
    • Insertion: Attachment of a muscle that allows the most movement.
    • Muscle Belly: The main body of a muscle.
    • Muscle Fiber: A muscle cell.
    • Origin: Attachment of a muscle that remains relatively fixed during muscular contraction.
    • Perimysium: Connective tissue surrounding each muscle fascicle.
    • Tendon: A cord of dense fibrous connective tissue connecting a muscle to a bone.

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    Description

    This quiz covers the three main types of muscle tissue: skeletal, cardiac, and smooth muscle. You'll explore their characteristics, functions, locations, and microscopic details. Test your knowledge to understand how these muscles contribute to various bodily functions.

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