Muscle tissue
- Created by: JS007
- Created on: 10-12-17 14:14
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- Muscle tissue
- Skeletal muscle
- Striated: regular light and dark bands.
- Due to the myofilaments that make up the fibre being thick (myosin - A band) or thin (actin - I band)
- Relative fast speed of contraction
- Controls voluntary movement
- Examples include breathing (contraction of diaphragm is considered voluntary)
- Each cell/fibre is multi-nucleated
- Cells can be up to 30cm long
- Nuclei are flattened and appear close to the sarcolemma
- Striated: regular light and dark bands.
- Smooth muscle
- Not striated
- Actin filaments are anchored irregularly to dense bodies in the sarcoplasm & sarcolemma
- Myosin filaments fit around the irregular web of actin filaments
- Instead of A & I bands sliding over each other, the entire cell contracts
- Due to anchored actin
- Relative slow contraction speed
- Controls involuntary movement
- Examples include blood vessels
- Not striated
- Cardiac muscle
- Striated: regular light and dark bands
- Responsible for involuntary movement
- Contraction is stimulated by the SAN (sinoatrial node)
- All cells are connected by gap junctions
- These are physical holes in the cell membrane (connexons)
- Made up of the protein connexin
- Relative intermediate speed of contraction
- Specific to the heart
- Cells have a single nucleus and are made up of myocytes
- Skeletal muscle
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