1. Muscular System

2. Did you know? 40% of our body weight is muscle
There are over 30 facial muscles
The meat you eat are the organisms muscles
Which the biggest muscle?
The heart is a muscle

3. Skeletal Muscle Fibers
Muscles of the Body
Made up of:
________ muscle tissue
_________ tissue
________ Vessels
___________
Skeletal
Connective
Blood
Skeletal Muscle Fibers

4. Skeletal Muscle Fibers
Are grouped in bundles called _________
__________ are bundled together by __________ tissue to create a __________.
Fasicle
Fasicles
Connective
muscle

5. Muscle Fibers (Muscles)
Contain many _________ which have two filaments 1. 2.
myofibrils
Actin
Myosin

6. Something to Ponder
Muscle fibers have many nuclei. Which other organelle would be the most abundant in muscle fibers? Why?

7. Actin _______ filament Thin Looks like ______________
A string of pearls

8. Myosin Thick ________ filament Looks like it has _____________
Oval heads

9. BRAINPOP!!! Flex Voluntary Skeletal Muscle Contract Tendon Involuntary
Striated
Cramp

11. The Pec Pop of Love

12. Which muscle is being used?

13. Which muscle is being used?

14. Which muscle is being used?

15. Muscle Review Game

16. Muscle Fatigue Videos https://www.youtube.com/watch?v=PzSnVyf_dkU

17. Voluntary vs Involuntary
Conscious control
You move them
Involuntary
Unconscious control
Move on their own

18. Sarcomere The ________ between _____ lines _________ when muscles move
distance Z
Contract
What is a Z line?
Point of attachment for myofibrils

19. Muscle Contraction

20. How do muscles contract?
________ heads bend inward and pull __________
It’s like _______________
This shortens the ______________
Does this require ATP (energy)?
Myosin
actin
Climbing a rope
sarcomere

21. Muscle Fatigue
Occurs when there is a ___________ in the ability for muscles to ___________
Short term vs long term fatigue
Why does this happen?
Not enough O2
reduction
contract
Short term (lifting heavy weights)
Long term (running a marathon)

22. Muscles Move in Pairs Muscles move in ____________ pairs opposite
While one _________ the other __________
Flexor- __________
Extensor- __________
opposite
contracts
relaxes
shortens
lengthens

23. Muscle Movement Activity Which muscles work in pairs to perform the following exercises?
#1: Bicep Curl
Flexor:
Extensor:
#2: Skull Crusher
#3: Leg Extension
Flexor:
Extensor:
#4: Wall Squat

24. Tendons vs Ligaments Tendons Ligaments Attach muscle to bone
Attach bone to bone

25. How does this effect movement?

26. How does this effect movement?

27. Livor Mortis Blood __________ in body parts closest to the ___________
Skin appears ____________
Onset __________ after death
Last about __________
accumulates
ground
Blue-purple
30 minutes
12 hours

28. What effects Livor Mortis?
Affected by things that __________ blood flow
E.X Tight clothing, Pressure from objects
Helps determine if _____________
impede
the body has been moved

29. Estimating Time of Death Rigor Mortis
The stiffening of ________ after death
Muscles remain ________ because ____________ accumulates
muscles
contracted
calcium

30. Continued Starts __________ after death
Begins to reverse around _________
2 hours
15 hours

31. What can you tell me about this victim?

32. Example #1 Is this livor mortis or rigor mortis?
Explain the pattern on the body?

33. Example #2 Which muscles are effected by rigor mortis?
How long has she been dead?

34. Example #3
Explain the markings on the pig

35. Example #4
Where does lividity appear?