(1) they keep toxic substances out of the cell;
(2) they contain receptors and channels that allow specific molecules, such as ions, nutrients, wastes, and metabolic products, that mediate cellular and extracellular activities to pass between organelles and between the cell and the outside environment;
(3) they separate vital but incompatible metabolic processes conducted within organelles.
The mechanics of cytokinesis are not yet completely understood, but a great deal is known about the critical timing of its events and other aspects of the final step in the cycle of any one cell. The four stages of cytokinesis are initiation, contraction, membrane insertion and completion .
Air would go through the trachea, then the bronchi, the bronchioles, and then the alveoli.
Hey there!
If there is a temperature difference between two objects, the object that has a higher temperature will want to level out its heat. Therefore, it will transfer the heat it needs to the other object if it allows until they are the same temperature.
I hope this helps!
