Module 7: The Muscular System Part 3
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10 terms
Terms | Definitions |
|---|---|
 striated, involuntary, square ends, mononucleated, more sarcoplasm, larger mitochondria, large T-tubules, less sarcoplasmic reticulum | What is the general anatomy of cardiac muscle? |
| cardiac muscle fibers branch and interconnect within two separate networks: atria and ventricles | Describe the special characteristics of the heart muscle |
| through intercalated discs that connect neighboring cells. | How are the two networks atria and ventricles connected in the heart? |
| the discs are composed of desmosomes which hold the fibers together and gap junctions which allows direct communication btwn adjacent cells. | What are these intercalated discs? |
| contract/relaxes 75/min, higher oxygen requirement then regular tissue, require more ATP has a larger mitochondria. Generates little ATP via the glycogen-lactic acid pathway, but can use lactic acid to generate ATP. Contraction is intrinsic meaning stimulated by within heart. Intrinsic stimulation comes form autorhythmic cells | Describe heart physiology |
| intrinsic contraction, contraction is stimulated from within, autorhythmic cells | What type of contraction does the heart use and what makes it special? what cells are involved |
| there is a larger influx of Ca++ into the sarcoplasm | Why does cardiac muscle remain contracted for longer? |
| smaller than skeletal muscle fibers, have 10-15 thin filaments per thick filament and have intermediate filaments that attach to dense bodies like Z discs. They form networks joined by gap junctions that are arranged in sheets or layers. | Smooth muscle Anatomy |
| The duration of contraction is longer than in skeletal muscle | Describe the contraction of smooth muscle: |
| involuntary control, stimulated by action potential from autonomic nervous system regulated by hormones and local factors | What is the regulation of smooth muscle contraction? |
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