Part 1 - Muscle Anatomy and Physiology Model Building

Down below are a couple notes over important words that have to do with muscle movement. Also below those notes is my explanation over muscle movement and my example.

Key Terms:

• Tendon- a flexible but inelastic cord of strong fibrous tissue attaching a muscle to a bone
• Fascia- connective tissue fibers, primarily collagen, that form sheets or bands beneath the skin to attach, stabilize, enclose, and separate muscles and other internal organs
• Epimysium- a layer of connective tissue, which ensheaths the entire muscle
• Perimysium- a sheath of connective tissue that groups muscle fibers into bundles or fascicles
• Fascicles- a bundle or a cluster
• Endomysium- a wispy layer of areolar connective tissue that ensheaths each individual muscle fiber, or muscle cell
• Muscle fibers- a long, multi-nucleated muscle cells, or myofibers, that make up skeletal muscle
• Myofibrils- a basic rod-like unit of a muscle
• Protein filaments- long chain of proteins
• Plasmalemma- a plasma membrane that bounds a cell, especially one immediately within the wall of a plant cell
• Mitochondria- a membrane bound organelle found in most eukarytoic cells
• Nucleus- the central and most important part of an object, movement, or grou, forming the basis for its activity and growth
• Sacroplasm- of a muscle fiber is comparable to the cytoplasm of other cells but it unusually contains large amounts of glycosomes.

Physiology

Skeletal, cardiac and smooth muscle all work together to create contractions. Contraction is stimulated by electrical impulses transmitted by the nerves. All skeletal muscle and many smooth muscle contractions are faciliated by the neurotransmitter acetylcholine. 

Function

The way a muscle functions is determined by its location. The cross-sectional area of a muscle determines the amount of force it can generate by defining the number sacromeres which can operate in parallel. When a sacomere contracts, the Z lines move close together, and the I band becomes smaller and the A band stays the same width. At full contraction, the thin and thick layers overlap.

My Project