Download Muscles

Overview of Muscles
Muscles
How many muscles are in the human body?
Over 600
Three types of muscles:
Cardiac - walls of heart, striated (striped), involuntary
Smooth- organs, involuntary
Skeletal - striated, voluntary
http://www.shapesense.com/fitness-exercise/muscle-anatomy/
Lesson objectives
Teachers' notes
"Bi" means 2
Another name:
"chest / pecs"
muscle attaches at 2
different points at one end
Muscle Movement:
Muscle Movement
moves the upper arm away
from the vertical midline of
the body (i.e. the action of
raising your arms to the
side).
Flexes the arm at the elbow.
bends the arm at the elbow
Muscle Movement:
Triangular muscle on the
outer edge of shoulder
bends the spine to the side
Rotates the spine (it twists the
torso)
Muscle Movement:
reaching forward
moves arm away from
body
Quad: means 4
Rectus- "straight"
Muscle Movement:
Flexes spine (bends the
spine to the front)
Quadriceps
Alternate name: "thigh"
Muscle Movement:
straightens the leg
Divided into 4 parts
(the rectus femoris muscle
forms part of the quadriceps
femoris muscle group, along
with vastus lateralis, vastus
medialis, and vastus
intermedius)
Shape: flate triangular
muscle
Muscle Movement:
Shape: broad flat muscle
on each side of the back
raises, rotates, draws back
the shoulders
Muscle movement:
pulls arms in to your sides
"Tri": 3
"Maximus": large
attaches at 3 points at one end
Composed of 3:
Muscle Movement:
minimus, medius, maximus
Extends / straightens the arm
Muscle Movement:
rotates the upper leg outward
Extends the leg at the hip
Hamstrings
Muscle Movement:
Muscle Movement:
bends the leg
raises the heel
Group:
the biceps femoris muscle
forms part of the hamstrings
muscle group, along with
semimembranosus and
semitendinosus
Achilles Tendon
(not a muscle)
Tendons connect muscle to bone
Muscle Contraction and Relaxation
Which muscle is contracting in picture A?
triceps
Which muscle is contracting in picture B?
Contraction: muscle shortens and thickens
Relaxation: muscle lengthens (gets longer)
biceps
Which muscles are relaxing/ stretching?
Hamstring,
gastrocnemius
Which muscle is contracting?
quadricep