1. Anatomy-Muscular System
Muscle Types, Characteristics & Function

2. Bellwork What do you know about muscles? What do muscles do?
What are some anatomical movements?
Flexion – Extension – Abduction – Adduction – Rotation – Circumduction – Supination – Pronation – Inversion – Eversion – Elevation – Depression – Protraction – Retraction
How was your weekend?

3. Objectives Students will be able to:
Define terms for muscle types & characteristics
Identify muscle types, characteristics & function
Label & give examples of muscle types

4. Terminology Myo Muscle Tendon Connects muscle to bone Contraction
Shortening or tensing of a muscle
Striated
Striped
Voluntary
Conscious control by will/choice
Involuntary
Not under conscious control

5. General Characteristics
Muscles provide ACTION for the body
Excitable
Muscles are electrically excitable
Action occurs when nerve cell stimulates the muscle cell
Contractable
Muscle cells contract
Shorten or tense

6. General Characteristics
Extensible
Ability to stretch from the normal resting length
Elastic
Ability to return from a stretch to normal resting length

7. Muscle Types-Smooth Characteristics
Occurs in layers in walls of hollow internal organs
Blood vessels, digestive system, urinary system & other internal organs
Involuntary

8. Muscle Types-Smooth Structure Elongated cells with tapered ends
Not striated
Shorter than skeletal muscle cells

9. Anatomy-Muscular System Muscle Types-Smooth
Function
Slower to contract & relax
Can maintain longer contraction (endurance)
Wave like contractions

10. Muscle Types-Smooth
Smooth Muscle Cells
Microscope View
Stained

11. Muscle Types-Smooth Myofibrils Contractile part of muscle fiber
Nucleus
Hereditary material, controls metabolism
Sarcoplasm
Protein to control cell metabolism
Cell Membrane
Surrounds cell
Myofibrils
Nucleus
Sarcoplasm
Cell Membrane

12. Muscle Types-Cardiac Characteristics Occurs only in the heart
Involuntary

13. Muscle Types-Cardiac Structure Striated cells joined end to end
Cells interconnected in branching networks
Intercalated disks between cells to hold cells together

14. Muscle Types-Cardiac Function Capable of long contractions
Has strength & appearance of skeletal muscle
Has endurance of smooth muscle

15. Muscle Types-Cardiac
Cardiac Muscle Cells
Microscope View
Stained

16. Muscle Types-Cardiac Striations Stripes Intercalated Disks
Branch
Striations
Stripes
Intercalated Disks
Separate cells & hold cell together
Nucleus
Contains hereditary material & controls cell metabolism
Nucleus
Intercaladed Disks

17. Muscle Types-Skeletal
Characteristics
Attached to bone by a tendon
Function together with bones to provides movement
Voluntary

18. Muscle Types-Skeletal
Structure
Striated
Cylindrical shape with rounded ends
Covered by loose connective tissue called “fascia”

19. Muscle Types-Skeletal
Function
Contraction occurs when muscle cell is stimulated by an electro-chemical impulse from a nerve
Muscle contracts & moves body part

20. Muscle Types-Skeletal
Skeletal Muscle Cells
Microscopic View
Stained

21. Muscle Types-Skeletal
Epimysium
Connective tissue surrounding muscle
Perimysium
Connective tissue surrounding bundle of fibers
Endomysium
Connective tissue surrounding muscle fiber
Blood Vessel
Perimysium
Endomysium
Epimysium
Bone
Tendon

22. Muscle Types-Skeletal
Fascicle
Small bundle
Muscle fiber
Elongated contractile cell
Muscle Fiber
Fascicle
Blood Vessel
Endomysium
Perimysium
Epimysium
Bone
Tendon

23. Muscle Types-Skeletal

24. Wrap it up…
Go back to your list of muscles from the beginning of class
What muscle type are they? - Label on your sheet
On that same sheet…
Take one of the muscle types and give me
One Characteristic
It’s structure
One function
Turn in.