Notes for Muscle Tissue

1
Notes for Muscle Tissue

• Sara McKee
• smckee3_at_kent.edu
• SI spring 2009

2
Characteristics of Muscle Tissue

• E
• Responds to stimuli
• C
• Shortens
• E
• Stretches
• E
• Returns to original shape

3

• Cardiac Muscle Tissue
• Muscle cell called
• Located in the heart
• Striated
• Uninucleated
• Short Branched
• Involuntary
• Intercalated discs allow
• No Stem cells

• Smooth Muscle Tissue
• Located in
• Not striated
• Uninucleated
• Spindle shaped
• Arranged in sheets
• Involuntary
• Can divide to repair if injured

4

• Skeletal Muscle Tissue
• Muscle cell
• Attach to
• Multinucleated because
• Striated
• Voluntary
• Do not divide but
• The Sarcolemma
• The Sarcoplasm
• Can be stimulated to contract simultaneously by

5
Skeletal Muscle Fibers

• T-Tubules
• cause/ensure
• Form a tunnel for ECF to drain into muscle cell
• Sarcoplasmic Reticulum
• encircles each myofibril
• Stores Ca for

6
Levels of Organization
Muscle Cell- Muscle Fasicle- Muscle
Fiber- Epimysium- CT that surrounds Perimysium-
CT that surrounds Endomysium- CT that surrounds
7
The Sarcomere

• This is the Functional unit of the muscle
• They extend from Z-disc from Z-disc
• Actin is also called the
• Myosin is also called the
• Titan attaches to
• Its job is to