Muscle Structure Flashcards
Which 2 muscle tissues are striated?
Skeletal and cardiac
What are the properties of Skeletal muscle?
Skeletal muscle is a voluntary striated muscle that is attached to bone or fascia. This muscle tissue is multinucleate
What does skeletal muscle provide?
Locomotion; the ability to move
What are the properties of Cardiac muscle?
Cardiac Muscle is an involuntary striated muscle tissue. It is mononucleate and autorhythmic (the heart)
What are the properties of Smooth muscle?
Smooth muscle is involuntary and not striated. Like Skeletal muscle it is mononucleate but controlled by autonomic nervous system
Where can smooth muscle be found?
in the walls of many of our hollow organs (ex: gastrointestinal tract)
What are the 5 properties of muscle tissue?
- Excitability
- Conductivity
- Contractability
- Extensibility
- Elasticity
What is Excitability?
responding to chemicals released from motor neurons (muscle cells + neurons share characteristics)
What is Conductivity?
can propagate electrical signals over membrane
What is Contractability?
ability to shorten in response to an action potential to generate force
What is Extensibility?
ability to stretch or extend without damaging tissue
What is Elasticity?
ability to return to its original shape after being stretched (elastic fibers)
What is a muscle fiber?
an individual muscle cell
What is a fascicle?
a group of muscle cells within the belly of a muscle
What is a myofibril?
The major component of a muscle cell (takes up the most intracellular volume)
