Muscle Contraction

Which of the following are the regulatory protein in muscle contraction? (Multiple answer)

• Sarcoplasmic reticulum

• Actin

• Troponin

• Myosin

• Tropomyosin

Ca2+ will be released from the sarcoplasmic reticulum when

• impulse reaches neuromuscular junction

• impulse transmitted along T tubule

• ATP binds to sarcoplasmic reticulum

• acetyl choline binds to ligand gated ion channels

Ca2+ released by sarcoplasmic reticulum will bind to

• Actin

• Troponin

• Myosin

• Tropomyosin

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 bridge 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

In order for tropomyosin to change conformation, calcium has to bind with...

• Voltage Gated Ion Channel
• Ligand Gated Ion Channel
• Troponin Protein
• Actin Protein

During muscle contraction the 'Z' Lines will...

• Disappear
• Get Farther apart
• Get Closer Together
• Appear Thicker