Lecture12nth - Muscle spindles stretch receptors in...

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Unformatted text preview: Muscle spindles stretch receptors in skeletal muscles "normal muscle cells" – extrafusal muscle fibers innervated by alpha motor neurons "muscle spindle cells" – intrafusal fibers innervated by gamma motor neurons (Loudon Fall 2010 note-taking helper file) Figure 13-3a Muscle spindles monitor muscle length and prevent overstretching (Loudon Fall 2010 note-taking helper file) Figure 9-4 Figure 13-4a Gamma motor neurons cause intrafusal fibers to contract (Loudon Fall 2010 note-taking helper file) Figure 13-5a Alpha (extrafusal) and gamma (intrafusal) motor neurons fire together (Loudon Fall 2010 note-taking helper file) Figure 13-5b More complex reflex: Inhibition of antagonistic muscles AND stimulation of other muscles (Loudon Fall 2010 note-taking helper file) Figure 13-8 Tetanus in a muscle vs. tetanus the disease • You get tetanus shots to protect yourself from the disease tetanus or "lockjaw" (bacterium Clostridium tetani) • Bacteria produce tetanospasmin (neurotoxin) - selectively blocks neurotransmitter release at inhibitory synapses see Fig. 13-7 and 13-8 (Loudon Fall 2010 note-taking helper file) Cardiovascular system transport pump (heart) and tubes (blood vessels) (Loudon Fall 2010 note-taking helper file) Figure 14-1 Blood moves from areas of higher pressure to lower pressure (Loudon Fall 2010 note-taking helper file) Figure 14-2 MOVIE TIME! http://www.oneonta.edu/academics/Chem399/ (Loudon Fall 2010 note-taking helper file) Figure 14-3 Note that pressure is higher in top figure, so same flow rate but different stress on blood vessel walls (Loudon Fall 2010 note-taking helper file) Figure 14-4c Flow is proportional to (radius)4, so a vessel with twice the radius has 2 x 2 x 2 x 2 = 16x the volume flow rate (Loudon Fall 2010 note-taking helper file) Figure 14-5 ...
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This note was uploaded on 12/01/2010 for the course BIO SCI Bio Sci E1 taught by Professor Catherineloudin during the Spring '10 term at UC Irvine.

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