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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.


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. called ____, each surrounded by its own connective tissue sheath.

  • myofiber

  • sarcomere

  • myofibril

  • fascicle


Skeletal muscle cells are unusual in that they
Skeletal muscle cells are unusual in that they called ____, each surrounded by its own connective tissue sheath.

  • lack smooth endoplasmic reticulum.

  • have no mitochondria.

  • have multiple nuclei.

  • depend entirely on anaerobic respiration.


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.


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.


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 whole shorten in length, the muscle is said to exhibit

  • 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 accordance with 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.


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 thick filaments are overlapping is seen in the

  • 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 is

  • 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.


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 contraction comes from storage sites located in 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.


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.


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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