TRUE or FALSE -When viewed under polarized light, the dark staining bands are th
ID: 95139 • Letter: T
Question
TRUE or FALSE
-When viewed under polarized light, the dark staining bands are the A bands.
-The Z line is comprised of thick filaments attached to interconnecting proteins, delineating the ends of the sarcomere.
-Light staining areas of a muscle fiber viewed under polarized light are called I bands.
-The expanded portion of the axonal branch that faces a region of the sarcolemma is called a synaptic terminal.
-A space that separates the expanded tip of the axon at the neuromuscular synapse from the motor end plate is the synaptic vesicle.
-The sarcoplasmic reticulum conducts action potentials that spread across the sarcolemma into the cell.
-A muscle that opposes the action of a prime mover is a synergist.
-A muscle that assists a prime mover is an agonist.
-The fulcrum lies between the applied force and the resistance in a first-class lever.
Explanation / Answer
True- The A-band is visible as dark transverse lines across myofibers.
False - Z line is made up of thin filaments at either ends of sarcomere attached to interconnected proteins delineating the ends of the sarcomere.
True- I-band is the zone of thin filaments that is not superimposed by thick filaments (myosin).Thus they are stained light.
True- synaptic terminal is an area at the end of an axon that contains neurotransmitters.
False- synaptic vesicles (or neurotransmitter vesicles) store various neurotransmitters that are released at the synapse.
False- The sarcoplasmic reticulum is a specialized type of smooth ER that regulates the calcium ion concentration in the cytoplasm of striated muscle cells.
False-Synergist is a muscle that helps in the action of a prime mover .
True- The agonist in a movement is the muscle(s) that provides the major force to complete the movement. Because of this agonists are known as the 'prime movers'.
False -The fulcrum (f) lies between the applied force (AF) and the load in a first class lever.
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