GENERAL HISTOLOGY

Detailed explanation-1: -Cell membrane is the Gate keeper of cell because this membrane help in regulating the entrance and exit of molecules into and out of the cell.

Detailed explanation-2: -The cell’s outer membrane acts as a gate, preventing intruders from invading the cell. But viruses, like HIV, manage to sneak through the cell’s protective barrier.

Detailed explanation-3: -A: Facilitated diffusion works like a gate, the cell membrane acts as the gate keeper. When something that wants to enter a cell reaches a cell membrane and it can not enter via diffusion, a gate will open and allow the molecule to enter. The proteins that sit on the outside of the cell membranes act as the gates.

Detailed explanation-4: -Mitochondria. The mitochondrion, mitochondria denotes plural, is a double membrane bound organelle. Its inner membrane contains many infoldings called cristae.