00:01
So to conclude our lecture
on the muscular system,
recall that the muscular system
is made up of
three different types
of muscles.
00:09
We have skeletal muscles,
cardiac muscles,
and smooth muscles.
00:14
Skeletal muscle cells
are referred to
as skeletal muscle fibers
and are multinucleated
and striated.
00:23
The major functional properties
of our skeletal muscle fibers
include their
electrical excitability,
their contractility,
their extensibility,
and their elasticity.
00:37
The contractility of our
muscle fibers involves
the sliding of microfilaments
in the skeletal muscle fiber.
00:46
Contraction is coupled
with electrical excitation
of the
skeletal muscle fiber.
00:54
Impulses come from
the nervous system
to the muscular system
at the
neuromascular junction.
01:03
Cardiac muscles differ from
skeletal muscles
as they are
involuntary muscles.
01:09
While there are some
similarities,
cardiac muscles also exhibit
differences
in their structure
and their function.
01:17
Finally,
smooth muscles are also
going to differ
from our skeletal muscles.
01:23
While they are also involuntary
like our cardiac muscles,
they use different
regulatory proteins
during the process
of a contraction
compared to skeletal muscles.
01:36
This concludes our lecture on
the muscular system.
01:40
Thank you for listening.