Worksheets11.2 Muscle Contraction
Total questions: 20
Worksheet time: 11mins
__________ is attached to the Z line?
myosin
actin
thick filament
troponin
What is the contractile unit formed from Z line to Z line?
Sarcomere
T Tubule
Sarcoplasmic reticulum
Fascicle
____________ attaches to actin to form the cross bridge.
Troponin
Tropomyosin
Myosin
Calcium
What does calcium attach in a muscle contraction?
Myosin
Tropomyosin
Troponin
Actin
What is released from the sarcoplasmic reticulum?
Inorganic phosphate
ADP
Calcium
ATP
What is the name of the neurotransmitter released at a neuromuscular junction?
Calcium
Acetylcholine
Dopamine
Troponin
What causes the muscle to stop contracting?
Lack of effort
Myosin-Heads fail to attach
Calcium Ions are pumped away
Muscle fibre tears
The H zone changes size during a muscle contraction.
True
False
What does calcium attach in a muscle contraction?
Myosin
Tropomyosin
Troponin
Actin
Which of the following are the regulatory protein in muscle contraction? (Multiple answer)
Sarcoplasmic reticulum
Actin
Troponin
Myosin
Tropomyosin
Which of the following occur when ATP binds to the myosin head?
Myosin head change to low energy configuration
Myosin head undergoes power stroke
Myosin head detach from actin
Myosin head forms cross bridge
Which of the following decreases during muscle contraction? (Multiple answer)
I band
A band
Z line
H zone
M line
Rigor mortis occur because
Lack of calcium ions attach to tropomyosin
Lack of ATP attach to the myosin head
Muscle stiff due to lack of heat
Lactic acid accumulates in muscle
Power stroke will occur when
ATP binds to myosin head
Myosin head releases ADP and Pi
Myosin head hydrolyse ATP
Myosin binds to actin
Which of the following occur during muscle relaxation (multiple answer)?
Release of calcium from sarcoplasmic reticulum
Tropomyosin covers myosin binding site
Acetyl choline released into synapse
No cross bride formation
ATP binds to myosin head
Which of the following refers to the muscle cell?
Myofibril
Myofilament
Fascicle
Muscle fiber
Cross bridges are formed when
ADP and Pi released from myosin head
ATP binds to myosin head
Myosin head hydrolyse ATP
Tropomyosin binds to myosin binding site
A human dies
