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WorksheetsMuscle Contractions
Total questions: 18
Worksheet time: 16mins
Name the following in order from largest to smallest:
muscle, muscle fascicle, muscle cell, myofibril, filaments
muscle, muscle fascicle, muscle cell, filaments, myofibril
muscle, muscle cell, muscle fascicle, myofibril, filaments
muscle, muscle cell, muscle fascicle, filaments, myofibril
What is the length between Z-lines of an actin molecule called?
fascicle
sarcomere
myosin binding site
sarcoplasmic length
What must occur first before a muscle can contract?
An action potential must develop as energy/nutrients is gained from the digestive system
An action potential must travel to the muscle through the circulatory system
An action potential must enter the body through the respiratory system
An action potential must be sent through neurons in the nervous system
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 is the function of acetylcholine?
ACh binds to receptors on the sarcolemma and opens ion channels
ACh binds to receptors on the sarcolemma and closes ion channels
ACh binds to ion channels and open them
ACh binds to ion channels and closes them
What ions are transported by the activated ion channel in muscle cells?
Sodium ions rush out of the cell, while potassium ions rush into the cell
Calcium ions rush out of the cell, while potassium ions rush into the cell
Sodium ions rush into the cell, while potassium ions rush out of the cell
Calcium ions rush into the cell, while potassium ions rush out of the cell
What is the purpose of the sodium potassium ion channel?
Create an action potential
Cause contraction
Create a membrane potential
Cause the release of ATP
What binds to the active site on actin?
Actin
Myosin
Troponin
Tropomyosin
What is a cross-bridge?
When troponin and tropomyosin undergo a shape change
When the active site of actin is revealed
When the myosin heads bind to the actin active site
When the actin filaments slide past the myosin filaments
Which ways do muscles get their energy from?
Creatine Phosphate
Anaerobic Respiration
Kreb Cycle
Aerobic Respiration
Muscles move bones by
pushing
pulling
both pushing and pulling
A motor unit is a motor neuron together with __________.
a motor unit.
all the muscle fibers it controls
one muscle fiber
the muscle
Acetylcholine is bounds to the muscle cells.
Calcium is released.
Calcium binds to troponin.
Troponin and tropomyosin move to free actin.
Myosin heads use ATP to bind and move actin.
skeletal muscle
voluntary and striated
smooth muscle
involuntary and no striations
cardiac muscle
involuntary and striated
The epimysium covers
the entire muscle
the fascicle
the muscle fiber
the myofibril
Which connective tissue surrounds the fascicle?
epimysium
perimysium
sarcolemma
endomysium
