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.
In herbaceous dicot stems, the vascular system makes a ring, with the phloem to the exterior and xylem to the interior. In woody dicot plants, the rings grow to make a complete ring around the stem. Xylem growth makes the âannual ringsâ used to tell a treeâs age.In woody dicot plants, water and mineral movement occurs in the more recent years of xylem rings.igure 3. Cross section of dicot stems: Left: herbaceous dicot stem (vascular bundles are arranged in a circle) Right: woody dicot stem (phloem and xylem make complete rings around the stem). Figure 4. Cross section of woody dicot stems is used in identification. The pith may be solid, colored, hollow or chambered.