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Introduction to Muscle Tissue quiz #2

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  • What are voluntary muscles?
    Voluntary muscles are muscles that are under conscious control, such as skeletal muscles.
  • What is formed by a motor neuron and all the muscle cells it stimulates?
    A motor unit is formed by a motor neuron and all the muscle cells it stimulates.
  • Which muscles are controlled by the somatic nervous system?
    Skeletal muscles are controlled by the somatic nervous system.
  • What is the primary function of myoglobin in the body of humans and animals?
    The primary function of myoglobin is to store and release oxygen in muscle cells.
  • What is found within the intercalated disks of cardiac muscle?
    Gap junctions and desmosomes are found within the intercalated disks of cardiac muscle.
  • Where are smooth muscle pacemaker cells found?
    Smooth muscle pacemaker cells are found in the walls of hollow organs, such as the intestines and blood vessels.
  • How is exercise best described in terms of muscle activity?
    A) Voluntary muscle contraction
  • What kind of muscle tissue is found surrounding the urinary bladder?
    Smooth muscle tissue is found surrounding the urinary bladder.
  • What are the series elastic components of muscle?
    The series elastic components of muscle include tendons and connective tissues that transmit force during contraction.
  • What is not a function of muscle?
    C) Blood cell production
  • What structure stores calcium within a muscle fiber?
    The sarcoplasmic reticulum stores calcium within a muscle fiber.
  • What is the purpose of intercalated discs in cardiac muscle tissue?
    Intercalated discs allow for synchronized contraction of cardiac muscle cells.
  • What is not a function of skeletal muscle tissue?
    Blood circulation
  • Which term refers to a motor neuron and all the muscle fibers it innervates?
    The term is 'motor unit.'
  • Which microscopic structure is only found in cardiac muscle tissue?
    Intercalated discs
  • Where are intercalated discs found?
    Intercalated discs are found in cardiac muscle tissue.
  • Which organ lacks smooth muscle?
    Heart
  • Muscle fibers are made up of bundles of fibers called?
    Muscle fibers are made up of bundles of fibers called myofibrils.
  • What is not a part of the muscle?
    Neurons
  • What is true regarding cardiac muscle?
    It has intercalated discs
  • Which of these is an autoimmune disease that affects muscle contraction?
    Myasthenia gravis is an autoimmune disease that affects muscle contraction.
  • What are the three large muscle groups in force of summation?
    The three large muscle groups are the quadriceps, hamstrings, and gluteal muscles.
  • What structure tightly joins cardiac muscle fibers to neighboring fibers?
    Desmosomes
  • What is not a characteristic of muscle tissue?
    Secretion
  • What are three characteristics of cardiac muscle tissue?
    Cardiac muscle tissue is striated, has intercalated discs, and is involuntary.
  • What are the four common characteristics of all muscles?
    The four common characteristics are excitability, contractility, extensibility, and elasticity.
  • What is not a function of muscle tissue?
    Blood cell production
  • What is the purpose of motor nerve varicosities as they relate to smooth muscle?
    Motor nerve varicosities release neurotransmitters that diffuse to smooth muscle cells, causing contraction.
  • Which fibers send impulses to skeletal muscles?
    Motor nerve fibers send impulses to skeletal muscles.
  • What factor does not contribute to muscle fatigue?
    Increased oxygen supply
  • In skeletal muscles, what is the role of the sarcoplasmic reticulum?
    The sarcoplasmic reticulum stores and releases calcium ions to trigger muscle contraction.
  • What is the primary function of muscle tissue in the human body?
    The primary function of muscle tissue is to produce body movements through contraction.
  • What energy molecule do myocytes use to generate contraction force?
    Myocytes use ATP (adenosine triphosphate) to generate contraction force.
  • Why is muscle tissue highly vascularized?
    Muscle tissue is highly vascularized to supply nutrients like glucose and oxygen and to remove waste products such as carbon dioxide.
  • What are the three types of muscle tissue found in the human body?
    The three types of muscle tissue are skeletal muscle, cardiac muscle, and smooth muscle.
  • What common features are shared by all types of muscle tissue?
    All muscle tissue is highly vascularized, consists of tightly packed cells, and contains protein filaments called myofilaments.