Parts of the sarcomere

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final study guide for dr delferts class

A band

middle area in the sarcomere where thick and thin filaments are found.

A band
I band
Z disc
H zone
M line
sarcomere
neuromuscular junction
myoglobin
satellite cells
transverse tubules
sarcoplasmic reticulum
sarcolemma
sarcoplasm

I band

lighter, contains thin filaments but no thick filaments

A band
I band
Z disc
H zone
M line
sarcomere
neuromuscular junction
myoglobin
satellite cells
transverse tubules
sarcoplasmic reticulum
sarcolemma
sarcoplasm

Z disc

separate one sarcomere from the next

A band
I band
Z disc
H zone
M line
sarcomere
neuromuscular junction
myoglobin
satellite cells
transverse tubules
sarcoplasmic reticulum
sarcolemma
sarcoplasm

H zone

area of only thick filaments

A band
I band
Z disc
H zone
M line
sarcomere
neuromuscular junction
myoglobin
satellite cells
transverse tubules
sarcoplasmic reticulum
sarcolemma
sarcoplasm

M line

Supporting proteins that hold the thick filaments together in the H zone

A band
I band
Z disc
H zone
M line
sarcomere
neuromuscular junction
myoglobin
satellite cells
transverse tubules
sarcoplasmic reticulum
sarcolemma
sarcoplasm

sarcomere

contractile unit of muscle

A band
I band
Z disc
H zone
M line
sarcomere
neuromuscular junction
myoglobin
satellite cells
transverse tubules
sarcoplasmic reticulum
sarcolemma
sarcoplasm

neuromuscular junction

The connection between the motor neuron and muscle fiber

A band
I band
Z disc
H zone
M line
sarcomere
neuromuscular junction
myoglobin
satellite cells
transverse tubules
sarcoplasmic reticulum
sarcolemma
sarcoplasm

myoglobin

An oxygen-storing, pigmented protein in muscle cells.

A band
I band
Z disc
H zone
M line
sarcomere
neuromuscular junction
myoglobin
satellite cells
transverse tubules
sarcoplasmic reticulum
sarcolemma
sarcoplasm

satellite cells

myoblasts that persist in mature skeletal muscle

A band
I band
Z disc
H zone
M line
sarcomere
neuromuscular junction
myoglobin
satellite cells
transverse tubules
sarcoplasmic reticulum
sarcolemma
sarcoplasm

transverse tubules

Invaginations, or deep indentations, of the sarcolemma into the sarcoplasm of the skeletal muscle cell

A band
I band
Z disc
H zone
M line
sarcomere
neuromuscular junction
myoglobin
satellite cells
transverse tubules
sarcoplasmic reticulum
sarcolemma
sarcoplasm

sarcoplasmic reticulum

stores and releases calcium into sarcoplasm after nervous stimulation

A band
I band
Z disc
H zone
M line
sarcomere
neuromuscular junction
myoglobin
satellite cells
transverse tubules
sarcoplasmic reticulum
sarcolemma
sarcoplasm

sarcolemma

The plasma membrane of a muscle cell

A band
I band
Z disc
H zone
M line
sarcomere
neuromuscular junction
myoglobin
satellite cells
transverse tubules
sarcoplasmic reticulum
sarcolemma
sarcoplasm

sarcoplasm

the cytoplasm of a muscle fiber

A band
I band
Z disc
H zone
M line
sarcomere
neuromuscular junction
myoglobin
satellite cells
transverse tubules
sarcoplasmic reticulum
sarcolemma
sarcoplasm

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