A&P - 7.3 - Muscle Contraction

What is the name of structure #1?

• Troponin

• Tropomyosin

What is the name of structure #2?

• Troponin

• Tropomyosin

The neurotransmitter that signals muscle contraction is...

• Calcium

• Actin

• Myosin

• Ach (acetylcholine)

Match Muscle Contraction Key Ideas

• twitch

• nerve cell that stimulates the muscle cell

• motor neuron

• Acetylcholine is a ___.

• water

• contraction of a muscle fiber

• neurotransmitter

• Muscles are made of a lot of ___ and only about 20% protein.

When was the sliding filament theory developed?

• 300 BC

• 1460s

• 1880s

• 1950s

• 1990s

What is the sliding filament theory?

• A description of the shapes of muscles

• A theory explaining that cardiac muscle is in the heart.

• An explanation for how muscle contraction occurs.

• It tells how muscles are named.

Reorder key ideas of muscle contraction steps

• Thin filaments move, which shortens the muscle

• Myosin cross-bridges form

• Cross bridges cause the thin filaments to begin to slide

What are two proteins involved in the contraction of muscle?

*Pick TWO.

• actin

• myosin

• fibrinogen

• collagen

• albumin

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

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

What is the point where the axon terminals of a nerve cell and the sarcolemma of a skeletal muscle join?

• adenine

• actin

• cross bridges
• neuromuscular junction
• myelin sheath