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Muscle Actions quiz #2

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  • What is the benefit of having both agonist and antagonist muscles at a joint?
    Having both allows for controlled movement in both directions and joint stability.
  • How do muscles act as levers in the body?
    Muscles attach to bones and contract to move them around joints, acting as levers to produce movement.
  • What is the role of muscle tone in stabilizing joints?
    Muscle tone provides a constant, low-level contraction that helps stabilize joints even at rest.
  • How do synergists and fixators work together during complex movements?
    Synergists assist the prime mover, while fixators stabilize the origin, ensuring efficient and controlled movement.
  • Why is it important to understand the different roles muscles play during movement?
    Understanding these roles helps explain how movements are coordinated and how injuries can be prevented.
  • What would happen if the antagonist muscle contracted at the same time as the agonist?
    If both contracted simultaneously, movement would be restricted or prevented, and joint strain could occur.
  • How does the nervous system coordinate the actions of agonist and antagonist muscles?
    The nervous system sends signals to contract the agonist while inhibiting the antagonist, allowing smooth movement.
  • What is the significance of muscle roles in rehabilitation and physical therapy?
    Understanding muscle roles helps target specific muscles for strengthening or relaxation during rehabilitation.
  • What is the main function of a fixator muscle during movement?
    A fixator stabilizes the origin of the prime mover, allowing effective and controlled movement by holding certain body parts steady.
  • How do agonist and antagonist muscles work together to produce movement at a joint?
    The agonist contracts to create movement while the antagonist relaxes to allow that movement, working in opposition to control and stabilize the joint.
  • What is the function of a synergist muscle?
    A synergist muscle aids the prime mover by working together to enhance a movement.
  • Which muscle group extends the thigh and flexes the knee?
    The hamstring muscle group extends the thigh and flexes the knee.
  • Which muscle group is responsible for extending the knee?
    The quadriceps femoris muscle group is responsible for extending the knee.
  • Which muscle causes wrinkles across the forehead?
    The frontalis muscle causes wrinkles across the forehead.
  • Which muscle is responsible for extending the elbow?
    The triceps brachii muscle is responsible for extending the elbow.
  • What is the action of the biceps brachii muscle?
    The biceps brachii muscle flexes the elbow joint.
  • What is the function of the sternocleidomastoid muscle?
    The sternocleidomastoid muscle flexes and rotates the head.
  • What is the action of the pectoralis major muscle?
    The pectoralis major muscle adducts and flexes the arm at the shoulder.
  • What is the action of the rectus abdominis muscle?
    The rectus abdominis muscle flexes the vertebral column.
  • Which muscle is used to grin?
    The zygomaticus major muscle is used to grin.
  • Which muscle relaxes when the arm flexes at the elbow?
    The triceps brachii muscle relaxes when the arm flexes at the elbow.
  • Which muscle extends the elbow?
    The triceps brachii muscle extends the elbow.
  • What is the function of the masseter muscle?
    The masseter muscle elevates the mandible to close the jaw.
  • What is the action of the gastrocnemius muscle?
    The gastrocnemius muscle plantar flexes the foot.
  • What is the action of the biceps brachii muscle?
    The biceps brachii muscle flexes the elbow joint.
  • What is the action of the adductor magnus muscle?
    The adductor magnus muscle adducts the thigh.
  • What is the action of the brachioradialis muscle?
    The brachioradialis muscle flexes the forearm at the elbow.
  • What is the function of the masseter muscle?
    The masseter muscle elevates the mandible to close the jaw.
  • What is the action of the adductor magnus muscle?
    The adductor magnus muscle adducts the thigh.
  • Which muscle plantar flexes the foot?
    The gastrocnemius muscle plantar flexes the foot.
  • Which muscle motion is used for frowning?
    The depressor anguli oris muscle is used for frowning.
  • What is a prime mover muscle?
    A prime mover muscle, or agonist, is the main muscle responsible for a movement.
  • Which muscle flexes the vertebral column?
    The rectus abdominis muscle flexes the vertebral column.
  • Which muscle extends the knee?
    The quadriceps femoris muscle extends the knee.
  • Which describes a muscle that opposes a movement?
    A muscle that opposes a movement is called an antagonist.
  • Which muscle group extends the knee?
    The quadriceps femoris muscle group extends the knee.
  • Which leg muscle extends the thigh?
    The gluteus maximus muscle extends the thigh.
  • Which muscle extends the elbow?
    The triceps brachii muscle extends the elbow.
  • Which muscle elevates the eyebrows?
    The frontalis muscle elevates the eyebrows.
  • Which describes a muscle that opposes a movement?
    A muscle that opposes a movement is called an antagonist.