chapter 3 cells copy

chapter 3 cells copy - Anita Badro SCI101 Chapter 3 Cells...

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Anita Badro SCI101 Chapter 3 Cells 3.1 1. what are the units to measure cells ? c. Micrometers 2. Describe three types of differentiated cells. Nerve cells are long with threadlike extensions that can be used to transmit motor or sensory information. Muscle cells are slender and rod-like which contract to move parts of the body. Epithelial cells, specifically simple squamous, are thin and flattened for gas exchange. 3.2 A Composite Cell 3. The three major parts of a cell are b. the nucleus, cytoplasm, and the cell membrane 4. Distinguish between the cytoplasm and the cytosol of a cell. The cytoplasm is composed of specialized structures called cytpolasmic organelles suspended in a liquid called cytosol. The cytoplasm surrounds the nucleus and is contained by the cell membrane. 5. Explain the general function of organelles. Organelles divide the labor in a cell by partitioning off certain areas or providing specific functions, such as dismantling debris or packaging secretions. 6. Define selectively permeable. Selectively permeable means that the cell membrane allows some substances to pass through easily, while excluding other substances. 7. Describe the structure of a cell membrane and explain how this structural organization provides the membrane’s function. The basic structure of the cell membrane consists of a phospholipid bilayer. It contains embedded protein molecules. It functions to keep the inner portion of the cell intact. It controls the entrance and exit of substances. 8. List three functions of membrane proteins. The functions of membrane proteins include acting as a receptor to combine with a specific substance such as a hormone, while some form narrow passageways, or channels, through which various molecules and ions can cross the cell membrane. Others function as enzymes in signal transduction.
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9. State a way that cellular adhesion is essential to health; and a way that abnormal cellular adhesion harms health. Cellular adhesion enables cells to aggregate to form tissues. Certain cellular adhesion molecules also assist the immune system in recognizing “self” and “non-self” cell surfaces. Abnormal cellular adhesion could indicate a potential threat to health.
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