Download File

Seats: period 1
 SMART board
Miss Andrews’ Desk 
6
Jamal
5
Shamena
4
Dorothy
3
Shantiera
2
Martell
1
Jimmy
12
Marcie
11
Deshandre
10
Stephanie
9
Tatiana
8
Christian
7
Lisa
18
Devon
17
Auziana
16
Patricia
15
Ashley
14
Erick
13
Osmar
24
Salma
23
Rasheed
22
Queenashe
21
Jorge
20
Fabian
19
Samuel
28
Briana
27
Kiara
26
Samantha
25
Oscar
32
Richard
31
Diquan
30
29
Seats: period 5
 SMART board
Miss Andrews’ Desk 
6
Abdi
5
Noel
4
Kiala
3
Kaila
2
Dominique
1
Melodie
12
Mary
11
Brittany
10
Nakerie
9
Maria
8
Daniel
7
Felix
18
Troy
17
Edwin
16
Noemi
15
Justine
14
Rosana
13
Minerva
24
Andre
23
Jakar
22
Tyrone
21
Luis
20
Juan
19
Vonnisha
28
Louis
27
Breanna
26
Melody
25
Renee
32
31
30
29
Catalyst
1. What happens when a beetle gets turned
onto its back? How does the structure of its
exoskeleton contribute to the problem?
2. List the names of at least 3 muscles you use
in gym class.
3. Which athlete is stronger, A or B? Why do you
think this?
A
4. Which athlete would have a better marathon
time?
5. Which athlete would be more likely to be
able to lift 700 lbs?
B
Passport Tracker
“Education is our passport to the future, for tomorrow
belongs to the people who prepare for it today.”
BIG goal = 80%
ET Shout Out!
1
80% party!
BIG goal = 80%
ET Shout Out!
5
Unit 5: Rock Your
Body!
Objectives
 We are learning about…
 the
Agenda
muskuloskeletal system
 We will be successful when we can…
 explain how the
musculoskeletal
system works with other systems to support
the body & allow for movement
broken
ulnar bone
•
Catalyst 8
•
Flash back! 5
•
Muscle Intro 15
•
Link it! 5
•
Fiber Types 15
•
Announcements 2
Muscular System
The muscular system is made up of all of the muscles
in a person’s body.
The main functions of the muscular system are:
1. Provide movement
2. Maintain body temperature
3. Maintain posture
 The muscular system connects to the skeletal
system via tendons (NOT ligaments…!)
FuNcTiOn 1: Movement
Muscles allow our skeletal system to move through contraction & relaxation.
FuNcTiOn 2: Body Temperature
Our muscles shiver to increase our body temperature when we are cold.
FuNcTiOn 3: Posture
Our muscles help us to stand tall.
Types of Muscle
1 Skeletal muscles work in pairs
 one muscle contracts while the
other one relaxes to move bones of
the skeletal system
 Contract means to tighten or
get shorter
 Relax means to loosen or get
longer
There are 3 types of
muscle fibers:
 skeletal muscle
 cardiac muscle
 smooth muscle
Cardiac Muscle
2• Cardiac muscle is found in the heart & helps pump blood
 We canNOT consciously control it…this is called
involuntary control
…opposite = voluntary control
Quick Check! Do skeletal muscles move via involuntary or
voluntary control?
•Shorter than skeletal muscle cells
•Have branches that join end to end
•Areas where branches join = gap junctions
•Gap junctions coordinate contraction so when
one cell contracts, others quickly follow
Smooth Muscle
3 Smooth muscle is found in digestive system & blood vessels
 It helps break down food and changes the size of blood
vessels to help us regulate body temperature
 We canNOT consciously control it…
involuntary
http://my.hrw.com/hssc_2012/hmd_na_bio/nsmedia/videoclips/videoplayer.html?bio_ch33_s2_v02.flv
Linked Systems
All of the human body systems work together!
Choose 1 other system that the muscular system
interacts with and explain in detail how they are linked.
Digestive system
Circulatory system
Skeletal system
Respiratory system
How do genetics affect athletics?
 Scientists want to know if race, gender, or
ethnicity play a role in the genetics that
account for the success of an athlete in a
particular sport
 Health & exercise are very lucrative
industries!
3 Types of Muscle Fibers
 Slow Twitch
– Type I
 Fast Twitch
– Type IIa
– Type IIb
 On average, humans have about 50% slow twitch
and 50% fast twitch fibers
 Our fiber type may influence the sports where we
are stronger
Type I
 Slow muscle contractions
 High resistance to fatigue…it takes a long time to get tired!
 Uses aerobic respiration
 Endurance performers have a higher percentage of slow
twitch fibers
– In the Olympics, marathon runners have had as much as 80% of their
muscle composition as slow twitch fibers
Type IIa
 Fast muscle contractions…between slow & really fast twitch fibers!
 Generates less force than Type IIb
 Uses some anaerobic & some aerobic respiration
 Type IIa fibers are utilized most during moderate exercise
such as swimming, ½ mile races, & long durations of weight
lifting
Type IIb
 Fastest muscle contractions
 Produce the most force and fatigue quickly…it does not take
long to get tired!
 Use anaerobic respiration
 Sprinters, shot putters, and 1 repetition maximum weight
lifters have an abundance of these fibers
– Olympic sprinters have as much as 80% fast twitch muscle
composition
Relative percentages of fast and slow twitch
fibers in a range of sporting activities
How do genetics affect athletics?
 While more research is being conducted, at this time,
scientists do not believe that you can just change
your fiber type from slow to fast twitch.
 However, it is believed Type IIa fibers can become
faster or slower depending on your training
schedule.
 Current research suggests you are born with a
specific amount of each fiber type and that’s how
you’ll stay.
Turn it in 
1.
Catalyst
(big basket)
2. Musculoskeletal: Muscles
#12 (binder)
Wednesday,
February 19th