WorksheetsMuscle Contraction
Total questions: 15
Worksheet time: 8mins
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 happens when the action potential reaches the axon terminal of a motor neuron?
Voltage-gated channels open, releasing sodium
Voltage-gated channels open, releasing acetylcholinesterase
Voltage-gated channels open, releasing acetylcholine
Voltage-gated channels open, releasing calcium
What do calcium ions do once they are released?
Calcium enters the muscle tissue
Cause sodium ions to enter the muscle
Cause potassium ions to exit the muscle
Cause acetylcholine to be released
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
The impulse/membrane potential caused by the ion channels affects what in the muscle cell?
The impulse releases more ACh
The impulse releases more calcium
The impulse releases ATP
The impulses releases ADP
Calcium inside the muscle cell binds to which filament, causing a shape change and revealing the active sites.
Actin
Myosin
Troponin
Tropomyosin
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
How do the actin filaments "slide"?
With the help of acetylcholine
With the help of ADP
With the help of ATP
With the help of calcium
When is ATP needed?
When actin slides
When myosin heads bind to actin
When myosin heads release from actin
When myosin slides
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
Which ways do muscles get their energy from?
Creatine Phosphate
Anaerobic Respiration
Kreb Cycle
Aerobic Respiration
