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rica_ross
on FreezingBlue Flashcards.
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Sessile
Anchored in one place
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Myofibrils
- Filaments embedded in muscle fibers
- Further dived into contractile units
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Sarcomere
- Contractile units of muscle
- Thick and thin filaments
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Sacrolemma
Membrance surrounding muscle fiber
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- Z- Defines boundaries of single sacromere
- M line- runs down center
- I band- contains only filaments thin
- H zone- Thick filaments only
- A band- Spans entire length thick and thin overlap
- During contraction A does not chang size, ony I band and H zone do because they contain only one type of filament
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Ach in muscle contraction
must be cleared from synapse to stop signal
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As Action Potential reaches interior muscle what happens with calcium
Power Stroke
- Sarcroplasmic reticilum releases calcium
- Calcium binds to tropin causing tropomysn to expose myosin binding site on actin
- Myosin binds to actin creating bridge
- Myosin pulls on actin and draws thin filaments to h zone and shortens sarcomere to A band length
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Threshold for contraction must be enough to
- get response but below means no response
- above threshold response can increase depending on stimulus
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Smooth Muscle
involuntary actions by ANS, slower contractions
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Skeleton Function
Support, movement, protection
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Hydrostatic Skeleton
- Fluid Skeleton, under lots of pressure within body cavity
- ex: earth worms
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Endoskeleton
Cartilage and bones
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Cartilage
- Connectie tissue made from flexible chrondrocyte cells
- Most lack blood vessels and nerves
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Diaphysis
- Clyindrical shape of long bones
- Compact bone around bone marrow
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Epiphyses
Dilated ends of long bones
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Bone Marrow
Where red and white blood cells are made
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Epipyseal Plate
- Growth plate made of cartilaginous disk seperates diaphysis from epiphysis
- site longitudinal growth
- when growth stops plate solidifies
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Periosteum
Fibrous sheath that protects bone
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Haversian Canal
Tiny channels that allow nutrients into bones
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Canaliculi Channel
Channel that eliminates waster
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Pseudopods
Ameboid organisms
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Chemotaxis
Move in direction based on gradient of diffusable chemical signals
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