By applying mild electrical stimulation to parts of an animal's cortex, gustav fritsch and eduard hitzig triggered body movements. they discovered what is now called the ) motor cortex. b) visual cortex. c) auditory cortex. d) somatosensory cortex.

Motor Cortex

Explanation:

The motor cortex is principal part of the brain that involves motor (motion) functions. The motor cortex's function involves planning, deciding, and executing physical movements.

In 1870 Gustav Fritsch and Edvard Hitzig showed that electrical stimulation of the cerebral cortex of a dog produced movements involuntarily.

This experiment was a crucial event in the development of modern neuroscience.

It became an experimental evidence for cerebral cortex involvement in motor function, the electrical excitability of the cortex, the topographic representation in the brain, and the localization of function in different regions of the cerebral cortex.

im not in connections yet but i might can you some questions. what grade are you in?

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!