Muscle cell
Same same but different
Muscle cell
Other organismal cells
sarcoplasm
cytoplasm
sarcoplasmic reticulum
smooth endoplasmic reticulum (SER)
sarcosome
mitochondrion
sarcolemma
cell membrane
New terminology
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So these new words are nothing new to you,
they only have different words
The reason is it is a specialized cell with special
functions
Most importantly it needs to be able to contract
Three different muscles
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Striated muscle cell
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Cardiac muscle cell
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Smooth muscle cell
Smooth muscle
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Smooth muscle is not under voluntary control
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It is not as highly organized as the other types
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You'll find this in arteries, guts, urinebladder,
Uterus, respiratory tract and reproductive tract
Examples of smooth muscle cells
Striated muscle cell
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Features a repeated unit called sarcomere
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Is highly organized
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Control is voluntary (except for heart cells)
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All (except heart) is somehow attached to
skeleton
Have several nucleus and not placed in the
centre
Myofibrils are consisting of repeating segments
of sarcomeres – long fibrous proteins
Build up of Striated muscle
Sarcomere
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This is how it looks under microscope
Cardiac cells
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Striated muscle
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Not voluntary control
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Central nuclei as opposed to striated cells
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Usually only one nucleus (up to 4)
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High mitochondrial density (why???)