The calcium that triggers muscle contraction is stored in synaptic vesicles. the motor neuron. the mitochondria. the endoplasmic reticulum.

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.

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes

What substance acts to prevent sudden ph changes in bodily fluids?