Title: Anatomy & Physiology chapter 11 Physiology of the Muscle Flashcards - Cram.com
Headings: Anatomy & Physiology Chapter 11 Physiology Of The Muscle
Anatomy & Physiology Chapter 11 Physiology Of The Muscle
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What are the three major functions of the skeletal muscles? (a) endomysium, (b) perimysium, (c) epimysium

Name some features of the muscle cell that are not found in other types of cells
Excitability, contractibility, and extensibility

What causes the striations observed in skeletal muscle fibers? The striations r a result of the A bands of sarcomeres appearing as relatively wide, dark stripes under the microscope, which alternate with narrower, lighter colored stripes formed by the I bands

Why is the triad relationship between T tubules and the SR important
The triad allows an electrical impulse traveling along a T tubule to stimulate the membranes of adjacent sacs of the SR

Describe the structure of thin and thick myofilaments, and name the kinds of proteins that compose them
Thin filament (actin, troponin,& tropomyosin): molecules strung 2gether like beads 2 form 2 fibrous strands that twist around each other. Describe the structure of thin and thick myofilaments, and name the kinds of proteins that compose them
Thick filament (myosin): shaped like golf clubs,w/ their long shafts bundled together 2 form a thick filament & their “heads” sticking out from the bundle

What is the role of calcium ions (Ca++) in muscle contraction? Calcium ions released from the SR bind to troponin in the thin filament allow tropomyosin 2 shift frm its position blcking the active sites of actin molecules, thus initiating the chemical reactions that produce contractions

Where does the energy stored in ATP come from? Catabolism of foods

What is the role of myoglobin in muscle fibers?