Unit 5 Day 1 Anatomy

1. Unit 5 Day 1 Anatomy To understand is to forgive, even oneself. Alexander Chase

2. Today’s Agenda • Return Tests • Notes on objectives 1-3 • Practice objectives 1-3 • Plans for tomorrow

3. Muscles Unit Fig. 38.26, p. 663

4. SMOOTH MUSCLE SKELETAL MUSCLE width of one muscle cell cells teased apart for clarity cell nucleus CARDIAC MUSCLE Obj. 1 junction between adjacent cells Fig. 33.8, p. 566

5. triceps relaxes triceps contracts, pulls the forelimb down biceps contracts at the same time, and pulls forelimb up at the same time biceps relaxes Fig. 38.18, p. 656

6. bundle of muscle cells surrounded by connective Tissue (endomysium biceps outer sheath of connective tissue around muscle (epimysium) one muscle cell Fig. 33.9, p. 566

7. muscle’s outer sheath (connective tissue) fascicle muscle cell myofibril perimysium Fig. 38.20a, p. 658

8. one myofibril inside cell: sarcomere sarcomere Z band Z band H zone Z band I band A band I band Fig. 38.20b, p. 658

10. Thick filament Thin filament

11. one actin molecule thin filament Arrangement of actin molecules in the thin filaments of a sarcomere parts of myosin molecule thick filament Arrangement of myosin molecules in the thick filaments of a sarcomere Fig. 38.20c, p. 658

12. Cross-bridge forms between an actin and a myosin filament sarcomere between contractions Actin filament slides past myosin filament, toward sarcomere’s center, in a power stroke actin myosin actin same sarcomere contracted The cross bridge is broken Another cross- bridge forms between same filaments Another power stroke slides actin filament closer to the center of sarcomere Fig. 38.21, p. 659

13. TRICEPS BRACHII BICEPS BRACHII PECTORALIS MAJOR DELTOID TRAPEZIUS SERRATUS ANTERIOR EXTERNAL OBLIQUE LATISSIMUS DORSI RECTUS ABDOMINUS GLUTEUS MAXIMUS ADDUCTOR LONGUS BICEPS FEMORIS SARTORIUS QUADRICEPS FERMORIS GASTRONEMIUS TABIALIS ANTERIOR Fig. 38.19, p. 657

14. For Tomorrow • Gloves • Groups • Depelting

15. ADP + Pi Pathway 1 DEPHOSPHORYLATION CREATINE PHOSPHATE Relaxation Contraction creatine Pathway 2 AEROBIC RESPIRATION Pathway 3 GLYCOLYSIS ALONE glucose from bloodstream and from glycogen breakdown in cells oxygen Fig. 38.22, p. 660

16. motor neuron section from spinal chord Signal from the neuron system travel along spinal cord, down motor neuron T tubule Sarcoplasmic reticulum (calcium storage) plasma membrane of skeletal muscle cell one of the myofibrils inside the muscle cell section from a skeletal muscle Z band Z band Fig. 38.23, p. 660,61

17. troponin tropomyosin myosin head actin myosin binding site blocked myosin head actin Fig. 38.24, p. 661

18. peak relaxation stimulus contraction starts time number of stimuli per second number of stimuli per second tetanic contraction Fig. 38.25, p. 662 twitch repeated stimulation

19. receptor endings peripheral axon cell body axon axon ending cell body axon cell body axon axon endings dendrites dendrites SENSORY NEURON INTERNEURON MOTOR NEURON Spinal cord STIMULUS Biceps stretches. RESPONSE Biceps contracts Fig. 34.13, p. 583

20. Click to view animation. animation

21. Unit 5 Day 2 The most difficult thing in life is to know yourself. Thales

22. Today’s Agenda • Depelting instructions • Depelt • Clean-up

23. Depelt • Specimen abdominal side up on tray. • Incision through pelt only…no muscles. • Cut fascia, lift, cut fascia.

25. Unit 5 Day 3 If you want to be respected by others, the great thing is to respect yourself. Fyodor Dostoyevsky

26. Unit 5 Day 4 Too many people overvalue what they are not and undervalue what they are. Malcom Forbes

27. Unit 5 Day 5 Striving for excellence motivates. Striving for perfection is demoralizing. Dr. Harriet Braker