Question

Describe the load-velocity relationship of an isotonic contraction and how it varies with preload.

a. Load-velocity relationship depends on muscle color.
b. Load-velocity relationship is unaffected by preload.
c. Load-velocity relationship is directly proportional to preload.
d. Load-velocity relationship is inversely proportional to preload

Answer 1

The load-velocity relationship of an isotonic contraction varies with preload. It is inversely proportional to preload, meaning that as the preload increases, the load-velocity relationship decreases, resulting in slower muscle shortening. The correct option is d. The load-velocity relationship is inversely proportional to the preload

Step-by-step explanation:

In an isotonic contraction, the load-velocity relationship describes the relationship between the load (external resistance) and the velocity of muscle shortening.

The load-velocity relationship of an isotonic contraction is inversely proportional to preload. Preload refers to the initial stretch or length of the muscle fibers before contraction.

When preload increases, the load-velocity relationship decreases, meaning that a greater preloaded muscle fiber will generate less velocity during contraction.

On the other hand, when preload decreases, the load-velocity relationship increases, resulting in faster muscle shortening. The correct option is d. The load-velocity relationship is inversely proportional to the preload