BMSC 207 Muscles Final Test (Questions & Answers) Rated 100% Correct!!
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Course
BMSC 207 Muscles
Institution
BMSC 207 Muscles
Why are the ends of the A band the darkest region of the sarcomere? - ️️the thick
and thin filaments overlap
Skeletal muscle moves a bone at a joint, such as flexing the forearm at the elbow. How
is the opposite action produced (for example, extension at the elbow)? - ️️an
Agonistic mus...
BMSC 207 Muscles Final
Why are the ends of the A band the darkest region of the sarcomere? - ✔️✔️the thick
and thin filaments overlap
Skeletal muscle moves a bone at a joint, such as flexing the forearm at the elbow. How
is the opposite action produced (for example, extension at the elbow)? - ✔️✔️an
Agonistic muscle produces the opposite movement
Satellite cells lie just outside the muscle ____________________ - ✔️✔️fiber
membrane
What do satellite cells do when they become active? - ✔️✔️differentiate into muscle
when needed for muscle growth and repair
what type of muscle is unstriated? - ✔️✔️smooth muscle
The entire muscle is enclosed in a _____________________ sheath - ✔️✔️connective
tissue
Name the components of a whole muscle in order from greatest to smallest -
✔️✔️Whole muscle - Muscle fascicles - Muscle fibers - Myofibrils - Actin - Thin
filaments
the cell membrane of a muscle is called the - ✔️✔️sarcolemma
the enlarged end regions of the sarcoplasmic reticulum are called the - ✔️✔️terminal
cisternae
The cytosol between the myofibrils contain many ___________ and _________ -
✔️✔️glycogen granules, mitochondria
What type of muscle makes up 40% of bodyweight? - ✔️✔️Skeletal Muscle
________ forms thick filaments and ________ forms the thin filaments - ✔️✔️myosin,
actin
Myosin acts as an ATPase - explain what this means. - ✔️✔️the enzyme hydrolyzes
ATP into ADP and Pi creating the energy needed for movement
The _________ produces much of the ATP for muscle contraction - ✔️✔️mitochondria
, As contraction takes place, actin and myosin ______________ length - ✔️✔️do not
change
In a neuromuscular junction, synaptic vesicles in the motor neuron contain what
neurotransmitter? - ✔️✔️acetylecholine
which ion channels open when an action potential arrives at the axon terminal? -
✔️✔️voltage gated calcium channels
what type of transport is used to release ACh into the synaptic cleft? - ✔️✔️exocytosis
What type of channels open when ACh binds to receptors in the synaptic cleft? -
✔️✔️Chemically gated sodium channels
How is ACh removed from the synaptic cleft? - ✔️✔️acetylcholinesterase
Calcium ions are stored here, they from the ___________ go into the cytosol during an
action potential - ✔️✔️terminal cisternae
What does myasthenia gravis cause? - ✔️✔️weakness and rapid fatigue of skeletal
muscles
how do action potentials propagate down to the interior of the muscle fibers? -
✔️✔️along the t-tubule network
The DHP receptor and ________ receptor are mechanically linked - ✔️✔️ryanodine
how is the conformation of the DHP receptor changed? - ✔️✔️an action potential
comes down the t-tubule
Besides mechanically, how else can Ryanodine receptors be activated? - ✔️✔️Calcium
induced calcium release
Where do calcium ions bind to after being released from the RyR? - ✔️✔️troponin
The movement of tropomyosin after the binding of calcium reveals what? - ✔️✔️myosin
binding sites on the actin
The myosin _______ binds to the active binding sites on actin - ✔️✔️head
ATP ________ results in the myosin head pivoting around into the cocked state -
✔️✔️hydrolysis
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