Muscular system Chapter 6.

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Presentation transcript:

Muscular system Chapter 6

Types of muscle tissue skeletal smooth cardiac

Skeletal muscle anatomy basics Muscle fiber (= muscle cell) Fascicle Muscle (the whole organ) Tendons

(wrapped by perimysium) Epimysium Figure 9.1 Connective tissue sheaths of skeletal muscle: epimysium, perimysium, and endomysium. Bone Perimysium Endomysium (between individual muscle fibers) Muscle fiber Fascicle (wrapped by perimysium) Epimysium Tendon in middle of a fascicle Blood vessel (a) (b)

Microscopic anatomy of individual skeletal muscle fiber

The sarcomere the functional unit of skeletal muscle made of:

Actin regulatory proteins troponin tropomyosin

Sliding filament model of contraction: the contraction

Remember the splitting of ATP? Results in an ADP molecule, a P group, and energy

Sliding filament model of contraction: the contraction

What happens if. . . there is no Ca2+? there is no ATP?

What causes muscle contraction in the first place? neuromuscular junction

Neuromuscular junction

Muscle coordination synergists antagonists

Pathologies Muscular dystrophy

Smooth muscle

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