lecture 3-27 coaglulation, respiration I

lecture 3-27 coaglulation, respiration I - Chapter 42...

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Chapter 42 (p.882, pp.884-890) Learning objectives • Describe the structure of platelets. • Outline the sequence of events that occurs during blood clotting and explain what prevents spontaneous clotting in the absence of injury. ………………. . • Define gas exchange and distinguish between a respiratory medium and a respiratory surface. • Describe the different respiratory adaptations of aquatic and terrestrial animals. • For the human respiratory system, describe the movement of air through air passageways to the alveolus, listing the structures that air must pass through on its journey. • Explain how the respiratory systems of birds and mammals differ.
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Megakaryocyte Platelets – Origin: Cytoplasmic fragments of a large cell in bone marrow called… platelets Characteristics: 2-3 um size colorless no nucleus cytoplasm contains - smooth endoplasmic reticulum - mitochondria - granules w/ clotting proteins
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Hemostasis - prevents blood loss from damaged vessels. An overview in 3 steps: 1. Platelet activation gets “sticky”, releases factors more are activated 2. Platelets aggregate 3. Clot forms What happens in sequence…a little more detail: 1. Vasoconstriction – damaged endothelial cells immediately release a
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This note was uploaded on 03/19/2008 for the course BIO 311D taught by Professor Reichler during the Spring '08 term at University of Texas at Austin.

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lecture 3-27 coaglulation, respiration I - Chapter 42...

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