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Do Now: Major Muscles of the Leg

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Presentation on theme: "Do Now: Major Muscles of the Leg"— Presentation transcript:

1 Do Now: Major Muscles of the Leg

2 Gluteus Maximus Gastrocnemius

3 Important Announcements
There are 2 weeks in the semester 1 standards on Muscles (1 grades) 1 Vocabulary Quizzes (1 grade) 1 Review Game (prizes for winners) 1 Final Project – Simulation Lab (6 grades) 1 Final Exam (8 grades)

4 Muscle Strains and Sprains video
All cells have a fine network of actin and myosin fibers that contribute to cellular movement. But only muscle cells have them in such great abundance and far more organized for contraction. SMOOTH MUSCLE Smooth muscle was the first to evolve. Lining of blood vessels, wall of the gut, iris of the eye. Some contract only when stimulated by nerve impulse. Others generate electrical impulses spontaneously and then are regulated by nervous system. CARDIAC MUSCLE Small interconnected cell with only one nucleus. Interconnected through gap junctions. Single functioning unit that contract in unison via this intercellular communication. Mostly generate electrical impulses spontaneously. Regulated rather than initial stimulation by nervous system. SKELETAL MUSCLE Fusion of many cells so multi-nucleated. Attached by tendon to bone. Long thin cells called muscle fibers.

5 Whiteboard Activity Directions:
Write or draw on your whiteboard (recorder) (Opinion) What do you THINK the difference is between a hamstring STRAIN and SPRAIN? Share a story with your group! (talking only) Have YOU or someone YOU KNOW ever suffered from a muscle strain or sprain? All cells have a fine network of actin and myosin fibers that contribute to cellular movement. But only muscle cells have them in such great abundance and far more organized for contraction. SMOOTH MUSCLE Smooth muscle was the first to evolve. Lining of blood vessels, wall of the gut, iris of the eye. Some contract only when stimulated by nerve impulse. Others generate electrical impulses spontaneously and then are regulated by nervous system. CARDIAC MUSCLE Small interconnected cell with only one nucleus. Interconnected through gap junctions. Single functioning unit that contract in unison via this intercellular communication. Mostly generate electrical impulses spontaneously. Regulated rather than initial stimulation by nervous system. SKELETAL MUSCLE Fusion of many cells so multi-nucleated. Attached by tendon to bone. Long thin cells called muscle fibers.

6 Review… Organization of Skeletal muscle
nuclei tendon muscle fiber (cell) myofibrils actin and myosin

7

8 Structure of striated skeletal muscle
Muscle Fiber muscle cell divided into sections = sarcomeres Sarcomere functional unit of muscle contraction alternating bands of thin (actin) & thick (myosin) protein filaments

9 Muscle filaments & Sarcomere
Interacting proteins thin filaments braided strands Actin thick filaments myosin

10 Muscle Injury Videos Watch Only (no notes)
Video: Pulling a Hamstring Video: Muscle Tendon Sprains and Strains Video: Distal Biceps Repair

11 Reading: Strains and Sprains
Directions: Read and annotate. Answer the checking for understanding questions.

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