Chapter 11: Skeletal Muscles and Producing Body Movements Flashcards
Name 5 different ways the muscular system contributes to homeostasis.
1) stabilizes body posture
2) produces movements
3) regulates organ volume
4) moves substances within the body
5) produces heat
Describe how skeletal muscles produce movements
Skeletal muscles exert force on tendons, which in turn pull on bones and other structures (ex. skin).
Contracting skeletal muscles moves one of its:
a) tendons
b) joints
c) articulating bones
d) b and c
e) a and c
articulating bones
most muscles cross at least ____ joint and are attached to the ______ bone that form that joint
one
articulating
Bones move _____ in response
a) unequally
b) equally
c) simultaneously
equally
____ is the attachment of a muscle’s tendon to a stationary bone or end opposite the insertion
a) insertion
b) origin
c) belly (body)
origin
_____ is the attachment of muscle’s other tendon to a moveable bone opposite the origin
a) insertion
b) belly (body)
c) origin
insertion
____ is the fleshy portion of muscle between tendons
belly (Body)
Define “Actions”
the main movement during contraction
The following would describe the “closing of a door” in the analogy of a spring on a door frame.
a) origin
b) action
c) insertion
d) body
action
Define “Reverse muscle action”
A RMA is a specific movement where actions are reversed (ex. positions of origin and insertion are switched).
T/F
The position of a muscle origin can be switched to become the muscle insertion.
True! This is called a reverse muscle action (RMA)
In the Spring on a doorframe analogy, _____ would be the end attached to the frame, whereas the _____ would be the end attached to the door.
a) lever
b) origin
c) fulcrum
d) load
e) insertion
a) origin
b) insertion
