Muscle contraction 2023 -HBS

tiny chains of contractile units between 2 Z disks, which are aligned end to end

• H
• Z
• synaptic cleft
• sarcomere

the only energy source that can be used to directly power muscle activity

• acetylcholine (Ach)
• ATP
• cross bridges
• neuromuscular junction

Tags

NGSS.HS-LS1-7

point where an axon terminals of a nerve cell and the sarcolemma of a skeletal muscle join

• acetylcholine (Ach)
• ATP
• cross bridges
• neuromuscular junction

specialized smooth endoplasmic reticulum that surrounds each myofibril, it stores calcium and releases on demand

• sarcolemma
• sarcoplasmic reticulum
• thick filament
• thin filament

What causes the force of the contraction?

• acetylcholine
• myosin moving 
• Calcium
• actin moving

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

• Sarcoplasmic reticulum

• Actin

• Troponin

• Myosin

• Tropomyosin

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

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

• ATP binds to myosin head