Amuscle contracts in response to an impulse carried by the type of neuron known as what

i think it is dna, i'm not totally sure but i think it might be.

the elements of art are the visual tools that the artist uses to create a composition. these are line, shape, color, value, form, texture, and space.

the principles of art and design are balance, contrast, emphasis, movement, pattern, rhythm, and unity/variety.