Physio EX Exercise:The Muscular System:Skeletal Muscle Tissue

The Muscular System: Skeletal Muscle Tissue
1.

Fill in the characteristics of the three muscle types:
Muscle Type

Cardiac

Shape of cell

Skeletal

branching chains of cells single, long cylindrical

# of nuclei

15 um in diamter, small

Striations

yes, has myofibrils and

sarcomers

Control

involuntary

100 um in size, big

Smooth single, spindle shape cells

2-10 in diameter, medium

yes, presences of myofibrilsno presence of myofibrils and sarcomeres voluntary involuntary

2.

tendons
What attaches muscles to bone? _____________________.

3.

The whole muscle is composed of muscle cells (fibers) grouped in bundles called ______________. fascicles 4.

Name the connective tissue coverings surrounding the following:
Whole muscle __________________ epimysium perimysium
Fascicles __________________ endomysium Muscle cell __________________

5.

Match the following three terms with their definitions:
2

Sarcolemma

Sarcoplasmic reticulum
Cytosol
6.

- endoplasmic reticulum in muscle cell
3

- intracellular fluid around organelles
- plasma membrane of muscle cell

1

Match the following three terms with their definitions:
Terminal cisternae

3

- T-tubule + 2 terminal cisternae

T-tubules 2
Triad 1
7.

- part of sarcolemma—carries action potential
- part of sarcoplasmic reticulum—stores calcium ions

Myofibrils consist of contractile proteins called ___________________. microfilaments Name the two types and what they’re composed of:
_______________
thin filaments

composed of ___________________ protien actin

protien myosin thick filaments
_______________ composed of ___________________

8.

Arrangement of myofilaments. Give the letter name of each band:
Dark band → A band
___
I
Light band → ___ band

Match two definitions with each band:
I

- contains only thin filaments
A contains
I-

defined by length of thick filament

A defined
9.