Download Muscles

Muscles
Interesting Muscle Facts
1. Thirty facial muscles create looks like surprise, happiness,
sadness, and frowning
2. Eye muscles are the busiest muscles in the body. Scientists
estimate they may move more than 100,000 times a day
3. Largest muscle in the body is the gluteus maximus muscle
in the buttocks.
4. It takes 10 muscles to smile, 12 muscles to frown ... and 1
to make a difference!
5. Smallest muscle in our body is in the inner ear and is called
stapes
What makes our bodies move?
MUSCLES!!!
– Marionettes are puppets on
strings. By pulling different
strings, you make these
puppets dance, bow or wave
their arms. Your skeleton is
similar to the puppet’s body.
It does not move unless
something pulls on its bones.
The strings that pull on your
bones are your MUSCLES.
What is Muscle?
Muscle is a tissue composed of
bundles of elongated cells
capable of contraction and
relaxation to produce
movement in an organ or body
part.
Muscle Fibres
Parts of the muscle
Tendon:
• white cord made up of
extremely strong tissues
• Connects muscle to the
bone
Body:
• thick part of the muscle
Aponeurosis:
• membrane of connective
tissue separating the
muscle from the adjacent
muscles
Tendon vs. Ligament
Functions of Muscles
A. Movement of limbs and organs
B. Posture maintenance
–
Even while you are still your muscles are continuously at work
in order to maintain your posture
C. Joint stabilization
–
Without muscles, some of our joints would not stay in place
D. Heat Release
–
–
–
Muscle contraction requires chemical energy
75% of this chemical energy is transformed into thermal
energy (ie. heat).
The thermal energy that is released helps maintain body
temperature at 37C
Your turn to figure it out!
Voluntary Movement
Voluntary Muscle
Involuntary Movement
Involuntary Muscle
A.
B.
C.
D.
Answers.
• A. Voluntary
• B. Involuntary
• C. Voluntary
• D. Involuntary
Voluntary vs. Involuntary Muscle
• Muscle can be voluntary or involuntary
a) Voluntary - consciously controlled by the brain
Ex: raising your arm to scratch your head
b) Involuntary - not consciously controlled by the
brain.
Ex: the contraction of the diaphragm during inhalation
There are 3 Types of Muscle
All the functions of muscle are carried out by
3 different muscle tissues:
1.Skeletal (Striated)
2.Smooth
3.Cardiac
Skeletal Muscle (voluntary -striated)
Skeletal Muscle
•
•
•
•
Voluntary
Striated appearance
Attached to the bones of the skeleton
Can generate a lot of force but tire easily: low
endurance
Smooth Muscle (Involuntary - no striations)
Smooth Muscle
• Involuntary
• No striations
• Make up the walls of the internal organs such
as the bladder, stomach, and uterus.
• Do not generate as much force as skeletal
muscle but do not tire easily: medium
endurance
Cardiac Muscle (involuntary - striated)
Cardiac Muscle
•
•
•
•
Involuntary
No striations
Found only in the heart
Has great strength and endurance
Antagonistic Muscles
• All muscles work in pairs. Whether they are
striated muscle, smooth muscle or cardiac
muscle makes no difference, all muscles must
work in pairs.
Antagonistic Muscle
Pair
biceps
triceps
When biceps contracts, the triceps
elongates and relaxes.
When the triceps contracts the biceps
elongates and relaxes.