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Unit 5 Day 1 Anatomy To understand is to forgive, even oneself. Alexander Chase Today’s Agenda Return Tests Notes on objectives 1-3 Practice objectives 1-3 Plans for tomorrow Fig. 38.26, p. 663 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 triceps relaxes biceps contracts at the same time, and pulls forelimb up triceps contracts, pulls the forelimb down at the same time biceps relaxes Fig. 38.18, p. 656 one muscle cell bundle of muscle cells surrounded by connective Tissue (endomysium biceps outer sheath of connective tissue around muscle (epimysium) Fig. 33.9, p. 566 muscle’s outer sheath (connective tissue) fascicle muscle cell myofibril perimysium Fig. 38.20a, p. 658 one myofibril inside cell: sarcomere Z band sarcomere Z band H zone Z band Fig. 38.20b, p. 658 I band A band I band Thin filament Thick filament one actin thin filament molecule 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 Cross-bridge forms between an actin and a myosin filament sarcomere between contractions actin myosin actin same sarcomere contracted Actin filament slides past myosin filament, toward sarcomere’s center, in a power stroke The cross bridge is broken Another crossbridge forms between same filaments Another power stroke slides actin filament closer to the center of sarcomere Fig. 38.21, p. 659 TRICEPS BRACHII BICEPS BRACHII PECTORALIS MAJOR DELTOID SERRATUS ANTERIOR TRAPEZIUS EXTERNAL OBLIQUE LATISSIMUS DORSI RECTUS ABDOMINUS GLUTEUS MAXIMUS ADDUCTOR LONGUS SARTORIUS BICEPS FEMORIS QUADRICEPS FERMORIS GASTRONEMIUS TABIALIS ANTERIOR Fig. 38.19, p. 657 For Tomorrow Gloves Groups Depelting ADP + Pi Pathway 1 DEPHOSPHORYLATION CREATINE PHOSPHATE Relaxation Contraction creatine Pathway 2 AEROBIC RESPIRATION oxygen Pathway 3 GLYCOLYSIS ALONE glucose from bloodstream and from glycogen breakdown in cells Fig. 38.22, p. 660 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 troponin tropomyosin myosin head actin myosin binding site blocked myosin head actin Fig. 38.24, p. 661 peak relaxation stimulus contraction starts time number of stimuli per second number of stimuli per second tetanic contraction twitch Fig. 38.25, p. 662 repeated stimulation receptor endings peripheral axon cell body axon axon ending cell body axon cell body axon axon endings dendrites SENSORY NEURON INTERNEURON dendrites MOTOR NEURON Spinal cord STIMULUS Biceps stretches. RESPONSE Biceps contracts Fig. 34.13, p. 583 Click to view animation. animation Unit 5 Day 2 The most difficult thing in life is to know yourself. Thales Today’s Agenda Depelting Depelt Clean-up instructions Depelt Specimen abdominal side up on tray. Incision through pelt only…no muscles. Cut fascia, lift, cut fascia. Unit 5 Day 3 If you want to be respected by others, the great thing is to respect yourself. Fyodor Dostoyevsky Unit 5 Day 4 Too many people overvalue what they are not and undervalue what they are. Malcom Forbes Unit 5 Day 5 Striving for excellence motivates. Striving for perfection is demoralizing. Dr. Harriet Braker
