Science Quiz / Histology Muscle

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Can you name the Histology Muscle?

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connective tissue sheath that surrounds a collection of fascicles
you can find triads of T tubules and sarcoplasmic reticulum in which type of muscle?
True or False: In the bending stage of the contraction cycle, the hydrolyzed ADP and inorganic phosphate remain bound to the myosin head.
this type of striated muscle is typically mono-nucleate
this structure in striated muscle contains voltage sensor proteins that are activated during depolarization
fascia adherens are located in which portion of the intercalated disk
Troponin C, T and I make up the ...
which molecule is required for the initiation of contraction?
Hydrolysis of ATP occurs during which stage of muscle contraction?
I band is bisected by which line
True or False: Attachment is the initial stage of muscle contraction, in which the myosin head is tightly bound to the actin molecule of the thin filament
Myofiber cytoplasm filled with cylindrical structures called?
Myofilaments are organized into repeating functional units
true or false: Myosin light chain dephosphorylation leads to cross-bridge formation between the myosin and the actin, leading to contraction
true or false: smooth muscle contraction can be initiated by mechanical, electrical, and chemical stimuli (all result in increased intracellular Ca2+)
which 2 proteins in smooth muscle block the myosin binding site on actin?
The 4th stage in the contraction cycle is...
highly specialized attachment sites in cardiac muscle
desmosomes are located in which portion of the intercalated disk
true or false: During contraction the A band shortens
true or false: During contraction the I band shortens
numerous tubule invaginations of the plasma membrane of myofibers
muscles that do not have striations
connective tissue that wraps around muscle fibers to form fascicles
thin filaments of muscle are composed of
True or False: During Bending, the hydrolysis of GTP causes conformational change of myosin.
protein is composed of 2 polypeptide heavy chains
dark bands within sarcomeres are known as
well developed smooth ER in muscle cells
this portion of the troponin complex binds Calcium
light band within the sarcomere is known as
true or false: Contraction is cause by and increased overlap of thin and thick filaments
neurotransmitter used in muscle contraction
the plasma membrane of muscle cells are known as
muscle cells
Located in walls of all hollow organs –digestive tract, blood vessels, urinary bladder, bronchial tree
a neuron along with specific muscle fiber that it innervates is known as a ___ ___
which protein in smooth muscle binds Ca?
the sarcoplasmic reticulum works with ____ to quickly move calcium in and out of striated muscle fibers.
what binds to the myosin light chain kinase to activate it?
True or False: T-tubules much larger in diameter in cardiac muscle than in skeletal muscle.
This Neurotransmitter opens Na+channels, leading to depolarization of sarcolemma and initiation of action potential in myofibers
Myofibrils are composed of
this portion of the troponin complex binds to actin, inhibiting actin-myosin binding
I band contains only which type of myofilament?
thin filaments in smooth muscle form
striated muscle attached to bone and responsible of movement of the axial and appendicular skeleton
connective tissue (reticular fibers) that intimately surround individual muscle fibers
muscle cells are formed from
gap junctions are located in which portion of the intercalated disks
striated muscle found in the heart
this portion of the troponin complex anchors troponin to tropomyosin
bundles of individual muscle fibers
The bind of which molecule initiates the start of release in the contraction cycle?
dense bodies are made up of a network of intermediate filaments containing which 2 proteins
thin or actin filaments attach to which line
you can find diads of T tubules and sarcoplasmic reticulum in which type of muscle?
true or false: calponin and caldesmon can be found in striated muscle
cytoplasm of muscle cell is called...
An influx of which molecule causes the activation of voltage sensor proteins and in turn the opening of Gated Ca release channels in muscle?
When the myosin head is tightly bound to the actin molecule of the thin filament, this is known as ...?
major component of the A band is
True or False: During Release, ATP binds to the myosin head, causing a conformational change, lowering the affinity of myosin for actin.
Name 1 component (there are 2) of thin filaments does striated muscle contain that smooth muscle does not?
thick filaments of muscle are composed of
which component in smooth muscle acts in a way similar to Z lines?
this protein runs in the groove formed by F-actin strands.
True or False: Attachment begins with the attachment of ATP to the myosin head.
the place where 2 networks of sarcoplasmic reticulum meet is called
The last stage of the contraction cycle is?
side polar myosin can be found in____?
dark A band is bisected by the lighter
bi polar myosin can be found in ______?
an autoimmune disease characterized by extreme muscle weakness. Acetylcholine receptors are blocked by antibodies to the receptor protein
The release of phosphate from the myosin head ______ the affinity of myosin to it's new attachment point on actin in the power strokeof the contraction cycle
G-actin polymerizes to form
protein that anchors thick filaments to the Z line
thin filaments are anchored to the z-line by which protein

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