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Muscle Worksheet

Sliding Filament

In the neuromuscular junction, the end of the motor neuron is called the: Axon Terminal
In the neuromuscular junction, the membrane of the muscle fiber is called Sarcolemma
The sarcoplasmic reticulum of a muscle fiber contains. Calcium ions
Within a sarcomere, the contracting proteins are: mysoin and actin
During a state of polarization,___ ions are abundant outside the cell, and ____ ions are abundant inside the cell. Sodium / potassium
During a state of polarization, the sarcolemma has a ___ charge outside and a ___ charge inside. positive / negative
During DEPOLARIZATION, the sarcolemma has a ___ charge outside and a ___ charge inside. negative / positive
When repolarization takes place,is potassium indside or outside the cell? Is sodium inside or outside the cell? outside / inside
DEPOLARIZATION of a muscle fiber is stimulated by Acetylcholine
In the sliding filament mechanism of a muscle contraction,the stimulus for contraction is Acetylcholine
In the sliding filament mechanism of a muscle contraction,the proteins that inhibit contractions are troponin and tropomyosin
In the sliding filament mechanism of a muscle contraction, the proteins that slide past each other as the muscle fiber shortens are actin / myosin
For relaxation of the muscle to occur,__inactivates acetylcholine and ___ ions returned to the sarcoplasmic reticulum. Cholinesterase / calcium
A layer of connective tissue covering each muscle fiber. Endomysium
The layer of connective tissue covering the whole muscle. Epimysium
The cell membrane of each muscle fiber. Sarcolemma
Layer of connective tissue that covers the fascicles within each muscle. Perimysium
What two things happen to stimulate muscle contractions? release of acetylcholine at motor end plate and release of calcium from sarcoplasmic reticulum
Which myofibril does calcium bind to after release from the sarcoplasmic reticulum Tropin
Myosin forms a crossbridge when it binds to actin and pulls the actin. True or False True
What is required to help release the myosin heads from the actin and get them back into a cocked position? ATP is needed for the myosin head crossbridge to detach from actin and re-cock
Created by: Alechia1



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