Final answer:
The cell membrane is responsible for allowing waste to exit, permitting entry of respiration chemicals, and controlling water movement. It operates via passive and active transport to regulate the cell’s internal environment.
Step-by-step explanation
The cell structure that allows waste to exit the cell, permits chemicals required for cellular respiration to enter the cell, and regulates the movement of water into and out of the cell is the cell membrane. This semipermeable membrane separates the cell from the external environment and controls the passage of organic molecules, ions, water, oxygen, and wastes. The cell membrane functions through passive and active transport processes, with osmosis being crucial for water regulation.
During passive transport, materials move through the membrane down their concentration gradient, requiring no energy. Active transport, on the other hand, requires energy to move substances against their gradient. The cell membrane's selective permeability is essential for maintaining the cell's homeostasis.