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.
The epidermis of a plant is the single, clear layer of cells that cover the roots, stems, flowers, fruits, and leaves. It acts like a protective covering from the sun, temperature changes, and moisture changes in the environment.Often a waxy coating, called a cuticle, adds an extra layer of protection.erry has a master's degree in environmental communications and has taught in a variety of settings. The epidermis of a plant is often overlooked, but it's an important barrier between the elements and the other tissues. Here, you'll learn about the structure and functions of the upper epidermis of a leaf.