Exit Ticket #2 for Muscle Contractions Vocabulary Quest

What is a motor unit?

• A single muscle fiber and the proteins inside it

• A motor neuron and all the muscle fibers it controls

• A bundle of muscle fibers within a fascicle

• A group of tendons that work together

A single, brief contraction in response to a single stimulus is called a:

• Tetanus

• Twitch

• Recruitment

• Threshold stimulus

Which of the following describes a graded muscle contraction?

• A contraction that varies in strength depending on the number of motor units activated

• A contraction that always produces the same amount of force

• A single contraction of a muscle fiber due to one nerve impulse

• A complete and sustained contraction with no relaxation

What is tetanus in muscle physiology?

• A) A disease that causes muscle spasms

• B) A single muscle contraction followed by relaxation

• C) A smooth, sustained muscle contraction resulting from rapid stimulation

• D) The partial contraction of a muscle at rest

What process increases the number of motor units activated to produce a stronger contraction?

• Muscle tone

• Threshold stimulus

• Recruitment

• Twitch

The minimum level of stimulation needed to cause a muscle contraction is called the:

• Recruitment level

• Graded contraction

• Muscle tone

• Threshold stimulus

7. What is muscle tone?

• The ability of a muscle to partially contract and maintain a level of tension

• The complete relaxation of a muscle

• The process of muscle growth

• The breakdown of muscle fibers

Which of the following best describes muscle tension?

• The resistance of a muscle to passive stretch

• The force a muscle exerts when it contracts

• The number of motor units activated in a contraction

• The ability of a muscle to stretch beyond its resting length

Which of the following best describes the sliding filament theory?

• A) Muscle fibers slide past each other, shortening the muscle

• B) Actin and myosin filaments slide past each other, causing muscle contraction

• C) Myosin heads detach from actin filaments, leading to muscle relaxation

• D) Calcium ions slide into the muscle fiber, initiating contraction

What is the function of ATP in muscle contraction?

• D) It inhibits muscle contraction

• B) It binds to actin, allowing myosin to attach

• A) It provides the energy needed for myosin heads to detach from actin

• C) It breaks down calcium ions