Muscular System Flashcards
Four cell types contribute movement
incudes:
- Amoeboid cells
- Flagellated cells
- Ciliate cells
- Muscle cells
are arranged usually in bundles or sheets.
Muscle cells or muscle fibers
Major function of muscular system
- Body movement and Maintenance of posture
- Respiration
- Production of body heat
- Communication
- Constriction of organs and vessels
- Heart beat
is the attachment site
that do not move during the
contraction
Origin
is the attachment
site that moves during contraction
Insertion
the bodily movement
cause by the contraction of
muscles.
Action
bends one part or another
Flexor
straight or extends apart
Extensor
draws a part away from the axis of the body
Abductor
lowers a part
Depressor
raises or elevates a part
Levator
rotates a part
Rotator
turn the ventral side down
Pronator
turn the ventral side up
Supinator
The ability of muscle cells to forcefully shorten.
Contractility
The ability to respond to a stimulus, which may be delivered from a motor neuron or a hormone
Excitability
The ability of a muscle to be stretched
Extensibility
3 properties of a muscle tissue
Contractility, Excitability, Extensibility
this is under the control of the will and forms the large proportion of the body musculature
Striated/Voluntary
the movement is not under the control of the will but under the control of the sympathetic nervous system; found in the walls of the digestive tract and other organs of the viscera; striations do not appear in this kind of muscle fiber.
Smooth/Nonstriated/Involuntary
found only in the heart. It is striated yet
involuntary
Cardiac
What do muscle fibers, or cells, consist of
bundles of myofibrils
Myofibrils contain bundles of
overlapping thick
myosin
overlapping thin protein filaments
actin
are the contractile units (fundamental
unit of muscle action)
Sacromeres
