Cross bridges are formed during muscle contraction when binds to .

Cross bridges are formed during muscle contraction when actin binds to myosin.

Explanation:

Contraction of muscle allows shortening of muscles fibers.

The process of contraction begins when an action potential arrives at neurotranmitter junction (neuron binds to muscle fiber). Acetylcholine (ACh) is released and the receptors recieved the signal which allows to open the sodium ion channel and results in action potentialin sarcolema. This triggers the release of calcium ion from sarcoplasmic reticulum (SR).

Muscle fiber are consiste of several fiber protein actin, myosin, tyrosin and troponin. Actin fiber binds to myosin and form a cross-bridge that allows the binding of calcium ion at myosin and generate ATP which causes contarction of muscle fiber.

Hence, when actin binds to myosin a crossbridge forms the ATP gneeration and causes contraction.

fabric is silk wool ext. paper isnt

explanation:

u cant make fabric out of paper cause paper comes from wood while fabric comes from animals

science-ocean floors and habitats study guide by volleyballqueen3817 a major advance in ocean-floor mapping. list four sections of the ocean floor. algae that use sunlight to produce their own food through photosynthesis. all of the feeding relationships that exist in a habitat. drying out, predators, find food.