How materials getting to the cells

Answer 1

It's unclear what you mean by "materials" in this case, so I'm going to assume you mean delivery via the circulatory system. Circulation throughout the body is able to collect hormones (from glands), glucose (from liver), oxygen (from lungs), and other chemicals. From the blood, these materials are delivered directly to cells following perfusion, the movement of blood into the capillary beds. Because capillaries are only one cell thick and the distance from the capillaries to neighboring cells is extremely small, these materials are able to diffuse freely from the blood to nearby cells. At this point, these chemicals will enter into the cells by either freely diffusing into the cell, moving into the cell through channel proteins, or actively transported inside by utilizing stored energy.

There are a lot of specifics for how different materials are transported to the cells (oxygen delivery via hemoglobin vs steroid delivery via albumin) but this is the general explanation behind, at least, circulatory delivery.