Anatomy Unit 4 Ch 8 Muscular System Test

What is the role of myostatin in muscle development?

• It promotes muscle growth.

• It stops stem cells from developing into muscle cells.

• It increases fat storage in muscles.

• It enhances muscle contraction.

What is the function of fascia in skeletal muscles?

• It generates electrical impulses.

• It separates and holds muscles in position.

• It produces chemical energy.

• It connects muscles to bones.

What happens to a tendon in tendinitis?

• It becomes inflamed and swollen.

• It breaks down completely.

• It strengthens and becomes more flexible.

• It shortens and hardens.

What is the function of the synaptic cleft?

• It stores neurotransmitters.

• It separates the neuron and the muscle fiber membranes.

• It generates electrical impulses.

• It connects muscle fibers to bones.

What is the role of myosin in muscle contraction?

• It binds to actin and exerts a pulling force.

• It releases neurotransmitters.

• It forms the sarcolemma.

• It stores calcium ions.

What is the sliding filament model of muscle contraction?

• Interaction of actin and myosin filaments increasing overlap.

• Release of neurotransmitters into the synaptic cleft.

• Formation of the sarcolemma.

• Storage of calcium ions in the sarcoplasmic reticulum.

What happens when ATP binds to myosin during muscle contraction?

• Myosin heads attach to actin filaments.

• Myosin heads release from actin filaments.

• Calcium ions are released from the sarcoplasmic reticulum.

• Troponin changes shape to expose binding sites.

What happens to the calcium ions during muscle relaxation?

• They are released into the sarcoplasm

• They are actively transported back into the sarcoplasmic reticulum

• They bind to myosin

• They remain in the transverse tubules

What is the role of myoglobin in muscle cells during aerobic respiration?

• It stores glucose for energy.

• It increases the amount of oxygen available.

• It converts lactic acid to pyruvic acid.

• It releases carbon dioxide.

How many ATP molecules are generated per glucose molecule in skeletal muscle during aerobic respiration?

• 2 ATP

• 18 ATP

• 36 ATP

• 48 ATP