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27 October 2008

27 October 2008. Lab This Week: Frog Muscle II: Testing a Hypothesis based on Isometric twitch contractions Reminder: Bring textbook to lab Run t-test in SPSS Ready to write Abstract (see assignment) Finish Ch 10 Control of Body Movement Begin Ch12 Cardiovascular Physiology. Fig. 10.07.

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27 October 2008

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  1. 27 October 2008 Lab This Week: Frog Muscle II: Testing a Hypothesis based on Isometric twitch contractions Reminder: Bring textbook to labRun t-test in SPSS Ready to write Abstract (see assignment) Finish Ch 10 Control of Body Movement Begin Ch12 Cardiovascular Physiology

  2. Fig. 10.07 Senses (transduces) muscle tension

  3. Golgi tendon organs oppose excessive muscle tension.Not monosynaptic!

  4. Fig. 10.01 Initiates motor command

  5. Fig. 10.02

  6. Fig. 10.10a

  7. Somatotopy Fig. 10.11

  8. Not monosynaptic! Fig. 10.12 Pyramidal tract Corticospinal tractCorticobulbar tract Extra-Pyramidal tracts Rubrospinal,Reticulospinal,Vestibulospinal tracts

  9. Movement Disorders Huntington’s chorea Parkinsonism Ballism andhemiballism Cerebellar disorder

  10. Ch 12 Cardiovascular Physiology 6 sections p. 359-439 2 CV labs: 1 Frog heart, 1 Human EKG and Blood Pressure

  11. Circulatory System Circulates • Nutrients: glucose, amino acids, fatty acids, ketones, etc • Wastes: • Hormones: bound & free • Gases: CO2 and O2 • Formed Elements: Cells and Cell Fragments • Erythrocytes, Leukocytes, Thrombocytes = Platelets Other roles of the Cardiovascular System Thermoregulation Blood Clotting Reproduction (ex: penile erection)

  12. Formed elements Blood volume ~ 5 liters Figure 12.01 Serum = plasma – clotting factors Entering and Exiting the blood Components…… Discontinuous capillaries in bone marrow, spleen, & liver permit erythrocytes to enter and exit blood. The Scoop on Tissie Hct = percentage of blood volume occupied by RBCs Anemia Blood doping & erythropoietin (hormone that stimulates erythrocyte production in bone marrow) to increase hematocrit

  13. Fig. 12.02 When left heart can’t pump all the blood it receives from pulmonary circuit (due to high aortic pressure and/or damage to left ventricle) blood accumulates in pulmonary circuit. This is congestive heart failure. Symptom: shortness of breath. Arteries..away from heartVeins..return to heart Regional blood flow determined by arteries and arterioles. Resting Cardiac Output = 5L/min for each side!

  14. Figure 12.04 CO = 5L/minfor each circuit Up to 35 L/min in strenuous exercise

  15. What’s missing? Pulmonary circuit 5 liters/min 5 liters/min Systemic Circuit Resistance Vessels Microcirculation Exchange Vessels Capacitance vessels

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