A. Cells have characteristic structures and functions that make them distinctive.
B. Processes in a cell can be classified broadly as growth, maintenance, reproduction, and homeostasis.
C. Life can be organized in a functional and structural hierarchy ranging from cells to the biosphere.
D. Most multicellular organisms are composed of organ systems whose structures reflect their particular function.
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Hormones are produced in the endocrine glands and are released in the blood stream. This tutorial will help the learners to understand how the hormones reach their target cells in order to communicate the message.
Type: Tutorial
This tutorial demonstrates how the structure of a signal molecule determines its function. Signal molecules can interact with either intracellular or extracellular receptors. For a signal molecule to bind with an intracellular receptor it must be able to pass through the cellular membrane. Generally signal molecules that enter the cell are nonpolar and fat soluble. These signal molecules can pass through the lipid bilayer of the cell membrane. Signals that bind with extracellular receptors are proteins or other types of molecules that cannot readily pass through the membrane.
This challenging tutorial addresses the concept at a high level of complexity.
Type: Tutorial