The Muscular System: Skeletal Muscle Tissue

| December 24, 2015

The Muscular System: Skeletal Muscle Tissue
1. Fill in the characteristics of the three muscle types:
Muscle Type Cardiac Skeletal Smooth
Shape of cell
# of nuclei
2. What attaches muscles to bone? _____________________.
3. The whole muscle is composed of muscle cells (fibers) grouped in bundles called ______________.
4. Name the connective tissue coverings surrounding the following:
Whole muscle __________________
Fascicles __________________
Muscle cell __________________
5. Match the following three terms with their definitions:
Sarcolemma – endoplasmic reticulum in muscle cell
Sarcoplasmic reticulum – intracellular fluid around organelles
Cytosol – plasma membrane of muscle cell
6. Match the following three terms with their definitions:
Terminal cisternae – T-tubule + 2 terminal cisternae
T-tubules – part of sarcolemma—carries action potential
Triad – part of sarcoplasmic reticulum—stores calcium ions
7. Myofibrils consist of contractile proteins called ___________________.
Name the two types and what they’re composed of:
_______________ composed of ___________________
_______________ composed of ___________________
8. Arrangement of myofilaments. Give the letter name of each band:
Dark band ?? ___ band
Light band ?? ___ band
Match two definitions with each band:
– contains only thin filaments
– contains both thick and thin filaments
– defined by length of thick filament
– defined as distance between two thick filaments
9. Define the following terms:
Z line (disc) _____________________________________________________
H zone _________________________________________________________
10. What happens to these areas during contraction?
Z line (disc) _____________________________________________________
H zone _________________________________________________________
11. Define these two terms:
M line _________________________________________________________
Sarcomere ______________________________________________________
12. Organization of muscle. Put the following components in order, from smallest to largest:
fascicle muscle
myofibril myofilament
muscle muscle fiber (cell)

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