Transcript The Human body

Most muscles work
together in pairs. One
muscle pulls while the
other muscle relaxes.
When you bend your arm
the biceps muscle pulls
and the triceps muscle
relaxes. When you make
your arm straight, the
biceps muscle relaxes and
the triceps muscle pulls.
Muscles are very important. They help you do
almost everything — from pumping blood
throughout your body to lifting your heavy
backpack. You control some of your muscles
and others, like your heart, do their jobs
without you thinking about them at all.
 You
use 17 muscles when you smile.
 You use 43 muscles when you frown.
 Provides
voluntary
movement of body


Enables breathing, blinking,
and smiling
Allows you to hop, skip,
jump, or do push-ups
 Maintains
posture
 Produces heat
 Causes
heart beat
 Directs circulation of
blood


Regulates
blood
pressure
Sends blood to different
areas of the body
 Provides
organs


Moves food through digestive tract
Enables bladder control
 Causes



movement of internal
involuntary actions
Reflex actions
Adjusts opening of pupils
Causes hair to stand on
end: goosebumps.
 There
are
three main
types of
muscle tissue
Skeletal
(striated)
 Cardiac
(heart)
 Smooth
(visceral)

Muscle Type
Skeletal
Cardiac
Smooth
Attached to bone Heart
Walls of internal
organs + in skin
Function
Movement of
bone
Beating of heart
Movement of
internal organs
Control Mode
Voluntary
Involuntary
Involuntary
Location
 ______Flexor
Muscle that bends the joint when
contracted.
Extensor Muscle that straightens the joint
 ________when contracted.
Contracted muscle
 __________
is short, firm, tight
and thicker around.
Relaxed
_______ muscle is
stretched, long, loose
and thinner around.
 Muscles
are bundles of cells and fibers.
 Muscles work in a very simple way. All they
do is tighten up--that is, contract--and relax.
 You have two sets of muscles attached to
many of your bones which allow them to
move.
 There are 630 active muscles in your body
and they act in groups.
 Muscles can only pull. They never push.