lecture 3-22 muscle types & circulatory sys I

lecture 3-22 muscle types & circulatory sys I - 2. A...

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Chapter 49 (continued) Learning objectives • Know the characteristics of slow and fast muscle fibers. • Distinguish among skeletal muscle, cardiac muscle, and smooth muscle. Chapter 42 (pp.867-883) Learning objectives • Distinguish between open and closed circulatory systems. List the three basic components common to both systems. • Using diagrams, compare and contrast the circulatory systems of fish, amphibians, non-bird reptiles, and mammals or birds.
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Figure 49.35 Summation of twitches Tetanus is a state of smooth and sustained contraction -produced when motor neurons deliver a volley of action potentials
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Animal Circulatory Systems – Two designs More complex animals Have one of two types of circulatory systems: open or closed Both of these types of systems have three basic components 1 . A circulatory fluid (blood – or hemolymph)
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Unformatted text preview: 2. A set of tubes (blood vessels) 3. A muscular pump (the heart) Some animals do not have a circulatory system. Their body tissues are so thin that they can simply absorb O through their skins. Nutrients simply diffuse from the digestive system to the other tissues. (ex. Flatworms, jellyfish .) In insects, other arthropods, and most molluscs Blood bathes the organs directly in an open circulatory system ( fig. 42.3a ) In a closed circula-tory system, the liquid inside the vessels ( blood ) and the liquid outside the vessels ( inter-stitial fluid ) do not mix, but rather stay separated by the vessel walls. A powerful four-chambered heart Was an essential adaptation of the endothermic way of life characteristic of mammals and birds...
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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 3-22 muscle types & circulatory sys I - 2. A...

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