Which component of a thin filament binds to calcium once the calcium ion is released from the sarcoplasmic reticulum?

Ineed the definitions of all of these words nasap i will give 1o points to whoever awnsers

Four types of motile cells in human body?

The hypothesis of continental drift states that earth's continents, which are located on tectonic plates, move relative to each other. which of the following is true of the movement of the tectonic plates? a. tectonic plates only move once every million years. b. they move at a rate of approximately 5 centimeters per year. c. tectonic plates never move, only the continents located on them do. d. their movements are very rapid and occur at random times.