Final answer:
Isotonic contractions refer to muscle contractions that produce a shortening muscle while maintaining a constant contraction strength at a given load.
Step-by-step explanation:
In Biology, the muscle contractions that produce a shortening muscle with a constant contraction strength at a given load are called isotonic contractions. In isotonic contractions, the tension in the muscle remains constant while the length of the muscle changes. There are two types of isotonic contractions: concentric and eccentric. Concentric contractions involve the muscle shortening to move a load, while eccentric contractions occur as the muscle lengthens.