Chapter 2

Chapter 2 - Chapter 2 How do cells provide protection and...

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Chapter 2 How do cells provide protection and support to the body? Different cells provide different types of protection and support to the body. Bone cells secrete a mineralized matrix, making the bone a strong structure that protects soft tissues such as the brain. Eye cells secrete tears(contains lysozyme), which wash and clean the outer surface of the eye. How do cells maintain internal homeostasis? The cell membrane acts as the gatekeeper to what goes into and leaves the cell. It is made up of mostly lipids and protein and is selectively permeable, meaning it only lets certain molecules pass through the membrane. When there is too much of a certain molecule inside the cell, the cell membrane allows some of the molecules to permeate the membrane and leave the cell. Conversely, when there is too much of a molecule outside the cell and not enough inside the cell, the cell membrane will allow enough of the molecule to permeate to maintain homeostasis. What are three common characteristics of all cells? Cells are capable of growth and differentiation. Cells are also capable of producing gametes. What is the role of cells in the metabolism of fuel molecules for energy? Cells consume energy and provide for the biosynthesis of proteins and macromolecules. The energy metabolized by cells is used for movement, secretion, and all other activities. Cells produce macromolecules for the use of other cells and for themselves. What are the major roles of the cell? The major roles of cells are to provide protection and support. What information can be obtained by the electron microscope? Electron microscopes use electrons to produce magnified images of objects that are smaller than the wavelengths of visible light. What are the differences between a scanning and a transmission electron microscope? Scanning electron microscopes is used to visualize cell surfaces and surfaces of internal structures. Transmission electron microscope visualizes structures within a cell in discrete layers. Is blood an extracellular or an intracellular fluid?
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Chapter 2 - Chapter 2 How do cells provide protection and...

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