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WorksheetsMuscle Contraction and Transmission
Total questions: 12
Worksheet time: 6mins
What neurotransmitter is used at the neuromuscular junction that sends a signal from the motor neuron to the skeletal muscle?
Glutamate
Acetylcholine
Norepinephrine
Dopamine
What binds to the active site on actin?
Actin
Myosin
Troponin
Tropomyosin
After the muscle is no longer stimulated, what occurs first
Acetylcholinesterase is released and removes ACh
The muscle continues to contract for a few more minutes
Enzymes break down calcium ions
The ion channels pump sodium back out of the cell and potassium back into the cell
What is the most basic level of the muscular structure?
Sarcolemma
Sarcomeres
Fibers
fascicles
The actin is labeled here as _______.
AD
AC
BC
AB
The myosin is labeled here as _______.
BD
AC
BC
AB
where the terminal branches of a motor neuron and the sarcolemma of a skeletal muscle fiber "join"
plasmodesmata
neuromuscular junction
gap junction
intercalated disc
a neurotransmitter that stimulates skeletal muscle fibers
dopamine
serotonin
acetylcholine
epinephrine
During a muscle contraction...
actin pulls on the myosin
myosin pulls on the actin
tropomyosin pulls on the myosin
troponin pulls on the actin
Which of the following substances are absolutely necessary for muscle contraction?
ATP and Na+
ATP and Ca2+
ADP+P
ADP and Ca2+
What is the function of the sarcoplasmic reticulum?
stores phosphorus
stores calcium
stores sodium
stores potassium
