Download The Muscular System

 Your skeletal and muscular systems work together
to make you move.
 The actions of muscles,
bones and joints working
together is like a lever .
Muscles that you are able to
control are voluntary muscles.
Muscles that you cannot control
consciously are involuntary
muscles.
Types of Muscle Tissue
 Skeletal Muscle- the muscles that move bones.
They are the most common and are attached
to bones by thick
bands of tissue
called tendons.
They look striped, or striated when viewed
under a microscope. They are voluntary and
are able to contract quickly, but will
become tired more easily than involuntary
muscles.
Smooth Muscle
Smooth Muscle :
nonstriated, involuntary
muscles that slowly contract
and relax. They are found
in your intestines,
bladder , blood vessels,
and other organs.
Cardiac Muscle
- striated muscle found ONLY in the
heart. It is involuntary and on average
contracts about 70 times per minute.
Working Muscles
Muscles in the body work
in pairs. When one
muscle contracts, the
other one relaxes . When
muscles contract, they
become shorter. When
muscles relax, they
become longer . Muscles
ALWAYS pull. They never
push.
.
Muscles can become larger or
smaller depending on how
much they are used.
Your muscles use lots of energy to contract and
relax. Your blood carries energy-rich
molecules (glucose) and oxygen to your
muscle cells where the chemical energy in the
molecules is released.
This energy changes to both mechanical energy
and thermal energy
.
.