Lecture_4 - I. Musculoskeletal System a. Muscle Action i....

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I. Musculoskeletal System a. Muscle Action i. Flexion : biceps and brachii 1. Figure 39-7, pg 835 2. Decreasing angle in the joint  ii. Extension 1. triceps 2. brachii 3. Figure 39-7 pg 834 iii. Abduction/adduction 1. Abduct: take away 2. Adduct: bring it back down  iv. Protraction/retraction 1. Arm straight in front of you: protraction 2. Bringing it back down: retraction v. Pronation/supination 1. Supine: palm facing upwards 2. Pronate: palm facing downwards  b. Skeletal Muscles (vs cardiac and smooth)  i. Muscle cell comparison (in Adams interactive program); Also,  Table 38-3, p 815  ii. Skeletal Muscle 1. Elongated cell 2. Multiple peripheral nuclei 3. Visible striations 4. Voluntary  iii. Cardiac Muscle 1. Branching cell 2. Single central nucleus 3. Visible striations 4. Involuntary 5. Intercalated discs  iv. Smooth Muscle 1. Spindle-shaped cell 2. Single central nucleus 3. Lack visible striations 4. Involuntary  v. Cerebrum, motor cortex is responsible when you want to take  notes in a class
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vi. For review: Read and know “Smooth muscle and cardiac  muscle…” on page 842 vii. Anatomy 1. 2. Follow Fig. 39-9,pg 837/838 3. CW-Adams Interactive physiology 4. ADAM Anatomy Review 5. Pg 836 d 6. Muscle fibers a. Single, elongated, multinucleated cell   b. Individual muscles in bundles called fassicle?  c. Endomysium layer of connective tissue that is  isolating the muscle fiber in the fassicle(?) d. Muscle is connected to the bone by a tendon  e. 39-9b  7. Myofibrils a. Tubes within the muscle cell itself  b. “Myo” muscle  c. “ils” smaller unit of the muscle fiber  d. Longitudinal divisions of cytoplasm(7) 8. Myofilaments a. Repeating sets Each unit is a sarcomere  (subunits of the myofibrils which are the subunits of  muscle fibers) b. Sarcomere i. The contracting unit ii. 2 types of myofilaments 1. Thin myofilaments a. Actin (quaternary level of  protein) b. Aka “Thin filaments” c. Fig 39-10, p 838, SFT-12  2. Thick myofilaments
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This note was uploaded on 04/06/2008 for the course BIOLOGY 102 taught by Professor Ta during the Spring '08 term at Rutgers.

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Lecture_4 - I. Musculoskeletal System a. Muscle Action i....

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