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Muscle MCQs. The fibrous connective tissue sheath which encloses a whole muscle is called the. endomysium. perimysium. epimysium. sarcolemma. Within a muscle the fibers are divided into larger bundles called ____, each surrounded by its own connective tissue sheath. sarcomeres

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the fibrous connective tissue sheath which encloses a whole muscle is called the
The fibrous connective tissue sheath which encloses a whole muscle is called the
  • endomysium.
  • perimysium.
  • epimysium.
  • sarcolemma.
slide3
Within a muscle the fibers are divided into larger bundles called ____, each surrounded by its own connective tissue sheath.
  • sarcomeres
  • sarcolemmas
  • myofibers
  • fascicles
the term is synonymous with muscle cell
The term ____ is synonymous with muscle cell.
  • myofiber
  • sarcomere
  • myofibril
  • fascicle
skeletal muscle cells are unusual in that they
Skeletal muscle cells are unusual in that they
  • lack smooth endoplasmic reticulum.
  • have no mitochondria.
  • have multiple nuclei.
  • depend entirely on anaerobic respiration.
slide6
Skeletal muscle cells are striated that is, they have alternating dark and light bands called ____, respectively.
  • A and I bands
  • H and M bands
  • Z and M lines
  • I and H bands
the i bands of skeletal muscle fibers each have a dark line in the middle called a
The I bands of skeletal muscle fibers each have a dark line in the middle called a
  • D line.
  • H line.
  • Z line.
  • X line.
slide8

A muscle is stimulated and exhibits a contraction (twitch). Before this twitch is over, it is stimulated again, and a second twitch occurs "piggyback" on the first one and causes a higher contraction strength. This phenomenon is called

  • tetanus.
  • graded contraction.
  • summation.
  • isometric contraction.
slide9
If enough muscle fibers contract to make the muscle as a whole shorten in length, the muscle is said to exhibit
  • complete tetanus.
  • graded contraction.
  • isometric contraction.
  • isotonic contraction.
a motor unit is
A motor unit is
  • the motor end plate where a nerve fiber synapses with a muscle fiber.
  • one motor neuron and all muscle fibers to which it leads.
  • a spinal reflex arc.
  • a sarcomere.
the contraction strength of a whole muscle varies in accordance with the
The contraction strength of a whole muscle varies in accordance with the
  • number of motor units activated.
  • innervation ratio.
  • amount of calcium released from the sarcoplasmic reticulum.
  • amplitude of the arriving action potentials.
contraction in a muscle occurs because the
Contraction in a muscle occurs because the
  • thin filaments get shorter.
  • thick filaments get shorter.
  • thin filaments slide between the thick filaments.
  • titin proteins pull on opposite ends of the sarcomere.
slide13
The region of the resting sarcomere where the thin and thick filaments are overlapping is seen in the
  • narrow dark line known as the Z line.
  • dark color of the I bands.
  • lighter region of the I bands.
  • dark color of the A bands.
the thick filaments of muscle are composed of
The thick filaments of muscle are composed of
  • tropomyosin.
  • actin.
  • troponin.
  • myosin.
the basic unit of muscle contraction is the sarcomere which is
The basic unit of muscle contraction is the sarcomere, which is
  • one A band and the adjacent I band.
  • the distance from one Z line to the next.
  • equivalent to a fascicle of muscle fibers.
  • equivalent to one of the myofibrils within a muscle fiber.
during contraction the
During contraction the
  • actin filaments bind to the myosin filaments.
  • I bands shorten.
  • sarcomeres do not change in length.
  • size of the H zone increases.
the ability of myosin to interact with actin is regulated by the binding of
The ability of myosin to interact with actin is regulated by the binding of
  • Ca2+ to troponin.
  • ATP to actin.
  • Ca2+ to tropomyosin.
  • the binding of titin to ATP.
the thin filaments of a muscle fiber consist of all of the following except
The thin filaments of a muscle fiber consist of all of the following except
  • tropomyosin.
  • myosin.
  • troponin.
  • actin.
slide19
The calcium that binds to troponin to activate muscle contraction comes from storage sites located in the
  • T tubules.
  • extracellular fluid.
  • synaptic vesicles of the motor neuron.
  • sarcoplasmic reticulum.
excitation contraction coupling refers especially to the
Excitation-contraction coupling refers especially to the
  • events at the neuromuscular junction where a motor fiber excites a muscle cell.
  • propagation of action potentials from the neuromuscular junction to the T tubules.
  • calcium release and binding to troponin molecules.
  • attachment of myosin cross bridges to the thin filaments.
slide21

ATP is required by two different processes that are necessary to the contraction and relaxation of a muscle: the interaction between the thick and thin filaments of the sarcomeres, and the

  • binding of acetylcholine to the motor end plate.
  • release of calcium from the sarcoplasmic reticulum.
  • movement of the troponin-tropomyosin complex.
  • reuptake of calcium by the sarcoplasmic reticulum.
slide22
In skeletal muscle contraction Ca2+ must bind to troponin for contraction to occur and in order for the muscle to relax the Ca2+ must
  • diffuse out of the cell.
  • be actively transported into the cell.
  • be actively transported into the sarcoplasmic reticulum.
  • be bound to tropomyosin until the next contraction.
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