Awareness and arousal are associated with different parts of the brain. Awareness involves the , whereas arousal is determined by the .

prefrontal cortex/reticular activating system

Explanation:

The prefrontal cortex is the part of the frontal lobe of the brain. The function of the prefrontal cortex is to control the planning, motivation, decision making, controls the emotions, behavior and also responsible for the awareness of self and the surrounding.

This region consists of cortical urinary center which controls the urination, anterior and middle arteries which controls the flow of blood. Thus this center is essential for self-awareness.

The reticular activating system can be defined as the system of neuron network. This is located in the brain stem, this is projected anteriorly to the hypothalamus which produce a behavior response. It is also connected to the posteriorly to the thalamus and is responsible for activation of awake in an individual.

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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!