Sliding Filament Theory Quiz

The motor unit consists of muscle fibers and a ________

• Motor neuron

• Synapse

• Sarcolemma

• Sarcoplasmic reticulum

What neurotransmitter is needed to initiate a muscle contraction?

• Acetylcholine

• Adrenaline

• Dopamine

• Serotonin

What substance causes the actin to change shape?

• Sodium

• Calcium

• Chloride

• Potassium

How does myosin and actin interact with each other?

• They do not interact

• They slide past each other

• They repel each other

• Cross-bridges form

What substance provides the energy for muscle contraction?

• ATP

• Glucose

• Lactic acid

• Glycogen

Tags

NGSS.HS-LS1-7

Where is calcium released from?

• Sarcolemma

• Sarcoplasmic reticulum

• Motor neuron

• Transverse tubule

What is the role of ATP in muscle contraction?

• It provides the energy for the power stroke of the myosin cross bridge.

• It acts as a neurotransmitter to initiate muscle contraction.

• It is the main component of the sarcolemma.

• It is responsible for the release of calcium ions.

What happens to the muscle when the concentration of calcium ions decreases?

• The muscle contracts more forcefully.

• The muscle relaxes.

• The muscle becomes paralyzed.

• The muscle begins to twitch uncontrollably.

What is the role of the sarcoplasmic reticulum in muscle contraction?

• It provides the energy for muscle contraction.

• It is the site where actin and myosin interact.

• It stores and releases calcium ions.

• It is the site where acetylcholine is released.

What is the role of the Tropomyosin in muscle contraction?

• It blocks the myosin binding sites on actin.

• It provides the energy for muscle contraction.

• It is the site where acetylcholine is released.

• It is responsible for the release of calcium ions.