Muscle Flashcards
Muscle tissues are highly specialized to do what
contract and shorten to produce movement
how many types of muscle tissues are there name them
there are 3, skeletal muscles, cardiac muscles, and smooth muscles
skeletal muscles tissue is packaged by what tissue
connective tissue
connective tissue packaged skeletal muscles tissue into what organs
skeletal muscles
skeletal muscles are attached to what
the skeleton
we can control skeletal muscles how
voluntarily consciously
these skeletal muscles form what
the flesh of the body or the so called muscular system
when skeletal muscles contract they do what
pull on bones or skin
the contraction of these skeletal muscles results in what
gross body movement or facial expressions
describe cells of skeletal muscles
The cells of skeletal muscle are long, cylindrical, multinucleate, and they have obvious striations (stripes).
skeletal muscle cells are uni or multi nucleated
multi
skeletal muscle cells are striped or no
yes they are striped
skeletal muscles are elongated how does that help their function
provide a long axis for contraction
skeletal muscles are often called what
muscle fibers
cardiac muscle is found only in the
heart
when cardiac muscle contracts what happens
As it contracts, the heart acts as a pump and propels blood through the blood vessels.
does cardiac have stripes
yes it has stripes
cardiac cells are uni or multi nucleated
uni nucleated
describe cardiac cells
uni nucleated relatively short, branching cells that
fit tightly together (like clasped fingers) at junctions called intercalated discs.
what is the name of the junction that cardiac cells fit in
intercalated discs
describe intercalated discs
contain gap junctions that allow ions to pass
freely from cell to cell
the intercalated cells allowing that ties the cardiac cells to a what
This ties the cardiac cells into a functional syncytium resulting in rapid conduction of the exciting electrical impulse across the heart.
what does the functional syncytium result in
rapid conduction of the exciting electrical impulse across the heart
how are cardiac muscles controlled
Cardiac muscle is under involuntary control, which means that we cannot consciously control the activity of the heart.
why is it called smooth muscles tissue
no striations are visible
describe cells of smooth muscle tissue
The individual cells have a single nucleus and are spindle-shaped (pointed at each end)
smooth muscles cells are uni or multi nucleated
single nucleus
where is smooth muscles found, give examples
Smooth muscle is found in the walls of hollow organs such as the stomach, uterus, and blood vessels.
As smooth muscle in its walls contracts, what happens to the cavity of the internal organ
the cavity of an organ alternately becomes
smaller (constricts when smooth muscle contracts)
or enlarges (dilates when smooth muscle relaxes)
so that substances are propelled through the organ
along a specific pathway.
smooth muscle:
the cavity constricts when what
smooth muscle contracts
smooth muscle:
the cavity dilates when what
smooth muscle relaxes
the contraction and relaxation of smooth muscle allows for what
that substances are propelled through the organ
along a specific pathway
in comparison to other smooth muscle contracts much more what
slowly
Peristalsis
a wavelike motion that keeps food moving through the small intestine, is typical of its activity
