Science Quiz / Histology Muscle

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Can you name the Histology Muscle?

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

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