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lecture 3-22 muscle types & circulatory sys I

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

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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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