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Introduction to Muscles and Muscle Tissue quiz #2

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  • Which muscle raises the upper lip?
    Levator labii superioris
  • Which sphincter operates under voluntary control?
    The external anal sphincter operates under voluntary control.
  • What muscles can assist the diaphragm to increase thoracic volume during inhalation?
    The intercostal muscles and accessory muscles like the sternocleidomastoid can assist the diaphragm during inhalation.
  • Which muscle is not part of the rotator cuff?
    Teres major
  • How do muscles work in antagonistic pairs?
    Muscles work in antagonistic pairs by performing opposite actions, such as one muscle contracting while the other relaxes.
  • What defines a motor unit?
    A motor neuron and the muscle fibers it innervates
  • Which muscle is a flexor of the thigh?
    Rectus femoris
  • What is one function of the muscular system?
    Facilitate movement
  • What muscle raises the upper eyelid?
    The levator palpebrae superioris muscle raises the upper eyelid.
  • How did this change the way you think about the muscular system?
    Understanding the muscular system's role in movement, posture, and heat production highlights its importance in daily functioning and overall health.
  • Which system controls skeletal muscle contractions?
    Nervous system
  • Which organ gives the body its structure and allows it to move?
    The skeletal system provides structure and, along with the muscular system, allows the body to move.
  • What are antagonistic muscles?
    Antagonistic muscles are pairs of muscles that work against each other to move joints, such as the biceps and triceps.
  • What does the muscular system do for the body?
    The muscular system enables movement, maintains posture, and generates heat for the body.
  • What is the muscular system responsible for?
    The muscular system is responsible for movement, posture maintenance, and heat production.
  • Which muscle is not a muscle of facial expression?
    Masseter
  • How does the skeletal and muscular system work together?
    The skeletal and muscular systems work together by muscles contracting to move bones at joints, facilitating movement.
  • What is the primary function of muscle tissue in the human body?
    The primary function of muscle tissue is to contract, converting chemical energy (ATP) into mechanical energy for movement.
  • Define contractility as it relates to muscle tissue.
    Contractility is the ability of muscle tissue to shorten forcibly with force.
  • Explain the property of elasticity in muscle tissue.
    Elasticity is the ability of muscle tissue to return to its original size after being stretched or contracted.
  • How does muscle tissue contribute to body temperature regulation?
    Muscle tissue generates heat as a byproduct of contraction, helping regulate body temperature.
  • Where is skeletal muscle located in the body?
    Skeletal muscle is attached to bones and is responsible for voluntary movements.
  • Where can smooth muscle be found in the body?
    Smooth muscle is found in the walls of hollow organs such as the digestive tract, bladder, and blood vessels.
  • Are cardiac and smooth muscle tissues voluntary or involuntary?
    Both cardiac and smooth muscle tissues are involuntary.
  • Which muscle tissues are striated?
    Skeletal muscle and cardiac muscle are striated.
  • Describe the shape and nuclei characteristics of skeletal muscle cells.
    Skeletal muscle cells are long, cylindrical, striated, and have multiple nuclei per cell.
  • What is unique about the appearance of cardiac muscle cells?
    Cardiac muscle cells are striated, have a branching pattern, and contain intercalated discs.
  • What is the function of intercalated discs in cardiac muscle?
    Intercalated discs connect cardiac muscle cells, allowing coordinated contraction.
  • How does the organization of proteins differ between smooth muscle and the other muscle types?
    Smooth muscle lacks the organized protein structure that creates striations, unlike skeletal and cardiac muscle.
  • How does muscle tissue convert chemical energy into mechanical energy?
    Muscle tissue uses ATP to power the contraction of muscle fibers, producing movement.
  • Can you consciously control the contraction of your heart muscle?
    No, cardiac muscle contraction is involuntary and cannot be consciously controlled.
  • How does the nervous system interact with muscle tissue to produce movement?
    The nervous system sends action potentials to muscle tissue, triggering contraction.
  • Why is elasticity important for muscle function?
    Elasticity allows muscles to return to their original shape after being stretched or contracted, maintaining muscle integrity.
  • Which muscle type is found in the walls of blood vessels?
    Smooth muscle is found in the walls of blood vessels.
  • What is the structural difference between skeletal and cardiac muscle cells?
    Skeletal muscle cells are long and cylindrical with multiple nuclei, while cardiac muscle cells are branched with a single nucleus.
  • What is the function of skeletal muscle in the urinary system?
    Skeletal muscle forms voluntary sphincters that control the release of urine from the body.
  • What is the role of action potentials in muscle contraction?
    Action potentials trigger muscle cells to contract by initiating electrical changes in the cell membrane.