Muscle Mechanics Quiz

What is a graded muscle response?

• A type of muscle fiber

• A single, rapid contraction of a muscle

• How a muscle cell responds to different types of stimuli

• The maximum tension a muscle can exert

What primarily stimulates skeletal muscle fibers?

• Hormonal stimuli

• Neural stimuli

• Chemical stimuli

• Physical stimuli

What is a muscle twitch?

• The maximum tension a muscle can exert

• A very brief and rapid contraction of a muscle in response to a single neural stimulus

• A type of graded muscle response

• A sustained muscle contraction

What makes up a motor unit?

• A single muscle fiber

• Motor neuron and the muscle fibers it supplies

• Multiple muscle twitches

• A group of muscle cells

What are the phases of a muscle twitch?

• Stimulation, action, and deactivation

• Latent, contraction, and relaxation

• Activation, peak, and deactivation

• Contraction, relaxation, and recovery

What happens during the latent phase of a muscle twitch?

• The muscle returns to resting state

• Cross bridges between actin and myosin are forming but not yet causing movement

• The muscle reaches its peak tension

• The muscle fiber shortens, causing movement

What determines the strength of a graded muscle response?

• The type of muscle fiber

• The frequency and strength of the neural stimuli

• The amount of muscle fibers involved

• The duration of the neural stimulus

What is temporal or wave summation?

• The process of increasing muscle tension by increasing the frequency of stimulation

• A single, prolonged contraction without relaxation

• The recovery phase after a muscle twitch

• A decrease in muscle tension over time

What is incomplete or unfused tetanus?

• The final phase of a muscle twitch

• A type of bacterial infection

• A sustained and quivering muscle contraction

• A single, rapid muscle contraction

What is the role of calcium in muscle contraction?

• It deactivates the cross bridges

• It stimulates the release of acetylcholine

• It binds to troponin, changing the shape of tropomyosin to allow actin-myosin binding

• It activates the myosin heads