Question

multiple choice 2 points
shortening a muscle while it maintains constant tension is called
an isotonic contraction
complete tetanus
an isometric contraction
incomplete tetanus
an isokinetic contraction

Explanation:

Analyze the question prompt

The question asks for the term that describes "Shortening a muscle while it maintains constant tension." This relates to the physiology of Skeletal Muscle Contraction.

Define the types of muscle contractions

• Isotonic contraction: A contraction in which muscle tension remains constant while the muscle changes length (either shortening in concentric or lengthening in eccentric contraction).
• Isometric contraction: A contraction in which the muscle develops tension but does not change length.
• Isokinetic contraction: A contraction in which the muscle contracts and shortens at a constant speed.
• Tetanus (complete/incomplete): A state of sustained muscle contraction evoked when the motor nerve emits action potentials at a high rate.

Match the definition to the correct option

The prompt specifies "shortening a muscle" (change in length) "while it maintains constant tension" (iso- means same, tonic refers to tension). This perfectly matches the definition of an isotonic contraction.

Answer:

• an isotonic contraction (Correct answer)
• complete tetanus
• an isometric contraction
• incomplete tetanus
• an isokinetic contraction