Biological cell membranes are selectively permeable, which means that the ease and rate of small molecules passing through membranes vary widely. The plasma membrane regulates exchange of nutrients, oxygen, inorganic ions, waste products, and water. The cellular membrane’s molecular organization controls permeability.
Answer:
The correct answer is b. reticular activating system.
Explanation:
The reticular activating system is located before the hypothalamus and mainly controls the activation of the awakening system and the day/night oscillations. Therefore, it's responsible for the consciousness states when sleeping.
