Ms. waters is thinking about a discussion in class today that surprised her. she learned that if she burns her finger, for example, a simple pathway of communication occurs, from sensory neurons through interneurons in the spinal cord back out through motor neurons. this pathway is more commonly referred to as a(n):

This pathway is more commonly referred to as a reflex arc.

A reflex arc is the pathway of neurons that controls a reflex (an involuntary reaction to a stimulus).  A reflex arc involves a few nerve cells and the information is transmitted from the body to the spinal cord. There are two types of reflex arc which are; somatic reflex arc that affects muscles, and autonomic reflex arc that affects inner organs. Most reflex arcs are composed of sensory neurons, receptors, interneurons, motor neurons and muscles.

i think that d. wind is the answer.   i missed the question when i answered a. currents.

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!