Insulin. Insulin is a hormone made by the beta cells in the pancreas. It is the key that opens the doors of cells and allows glucose to get into the cell. Each cell needs glucose to function. Carbohydrates in food are broken down into glucose which enters the blood stream.
The pericycle is a cylinder of parenchyma or sclerenchyma cells that lies just inside the endodermis and is the outer most part of the stele of plants.
But no, actually a trichome is a part of many plants and is a small hair like growth on the surface of leaves (and sometimes stems). These little hairs can be very functional in some plants. For example, a Venus fly trap has highly developed trichomes used to capture itâs prey.