Muscle Tissue Which way to the anatomy classroom?... This way…
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Transcript of Muscle Tissue Which way to the anatomy classroom?... This way…
Muscle TissueWhich way to the anatomy classroom?... This way…
Introduction
• Lets be very honest…• Many of the things that define
us as humans and as individuals are based on muscular movements• The ability to walk upright• The ability to play sports• The ability to play the saxophone• The ability to talk a selfie
Introduction
• Here is an unconventional example• My friend Jon is a professional
eater• The muscles that he uses defines
what he does• In fact we often talk about the
different types of muscles that could help him in his competitions
Muscle Tissue
• Muscle tissue is designed to help movement of the body or in the body• It is a diverse set of tissue that is
specialized for contraction• This contraction will pull on two
anchored bases and will allow for movement
Muscle Tissue
• There are three main types of muscle tissue• Skeletal Muscle• Cardiac muscle• Smooth Muscle
• These three different types of muscles are responsible for the entire movement system of the body
Skeletal Muscle
• Skeletal muscle is composed of large muscle cells that are designed to make strong contractions• It is a significant amount of your
body weight• 42% in men• 36% in women
Skeletal Muscle
• Skeletal muscle cells can be up to one foot in length• Single muscle cells are often
called muscle fibers• Muscle fibers are often bundled
with other muscle fibers to increase their strength and resistance to damage• These bundles give your muscle
a striped or striated appearance
Skeletal Muscle
• Skeletal muscles are controlled by the nervous system• This means that for a skeletal muscle
to contract a signal must come from a set of nerves• Since you have a large amount of
control over your nerves, you have a large amount of control over your muscle fibers• This means most of your muscle
movements come from striated voluntary muscle
Cardiac Muscle Tissue
• Ok… lets try an experiment• On the count of three I would
like everyone to try to make their heart stop beating for three seconds• This is not long enough for a
change in our bodies• Ready…• Set…• Go!
Cardiac Muscle Tissue
• Cardiac muscle tissue is located in the heart and is designed for long term involuntary use• These cells are designed to
contract many times a minute for the entirety of a human life• When they decide to take a 10
minute break… an organism dies• Cardiac muscle cells are referred
to as cardiocytes
Cardiac Muscle Tissue
• Cardiac tissue anchors on itself so it forms very strong interconnections with itself• This creates branching networks
of muscle cells that are interconnected• These connections occur at
places called intercalated discs
Cardiac Muscle Tissue
• Cardiac muscle cells do not wait for a nerve stimulus to start a contraction• Instead they use a signal that is
generated from a group of cells called pacemaker cells• These cells monitor the level of
blood needed in the body and send impulses that cause the heart to beat
Smooth Muscle Tissue
• Smooth muscle tissue is involuntary muscle tissue located in the walls of hollow organs • These muscles are designed to
create both short and long contractions that are not controlled the organism• Imagine how much concentration
and effort it would take for someone to control food from their mouth until it left them as waste
Smooth Muscle Tissue
• The smooth muscle tissue that lines the body is controlled by the nerves in the brain• However the part of the brain
that controls the smooth muscle tissues is at the base of the brain • This is the area of the brain that
we have very little (almost no) control over
Smooth Muscle Tissue
• Smooth muscle is often found in flat sheets that line organs• If it was bulky it would block
these hollow organs• This means that it does not
bundle the same way that skeletal muscle does• Because of the lack of muscle
control by the brain and the lack of bundles of fibers smooth muscle is referred to as nonstriated involuntary muscle