Muscular tissues Flashcards
Types of muscle tissues
Skeletal
Cardiac
Smooth
Striated muscle?
Skeletal
Cardiac
Involuntary tissue
Cardiac
Smooth
Features of skeletal muscles
Multiple nuclei
Lots of mitochondria
Myofibrils - myosin (thick) - actin (thin)
Organisation of skeletal muscles
organ - fibre - myofibril - filament - myosin/actin
How do motor neurons affect muscles?
Vertebrates - one motor neuron supplies muscle fibres as lots of axons
Arthropod - Lots of motor neurons supple muscle fibre.
What prevents fatigue?
asynchronous motor units - sub-maximal
Roles of skeleton
Support
Protection
Movement
Filaments of cytoskeletal?
Microfilaments
Intermediate filaments
Microtubules
Three main skeletal systems
Hydrostatic - annelids
exoskeletal - anthropods
endoskeletal - vertebrates
Hydrostatic system
Fluid movement - worms
Exoskeletal
Rigid - chitin
Protective
Limits growth and movements
Endoskeletal
Skeleton
Brain - skull
Organs in coelom
Circulatory
Leverage movement
