Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

A&P CH8 Key terms

A&P CH8 Muscular System

actin a protein that, with myosin, contracts muscle fibers
antagonist a muscle that acts in opposition to a prime mover
aponeurosis a sheet of connective tissue by which certain muscles are attached to adjacent muscles
fascia a sheet of fibrous connective tissue that encloses a muscle
insertion the end of a muscle attached to a movable part
motor neuron a neuron that transmits impulses from the central nervous system to an effector
motor unit a motor neuron and its associated muscle fibers
muscle impulse impulse that travels along the sarcolemma to the transverse tubules
myofibril contractile fibers within muscle cells
myosin a protein that, with actin, contracts and relaxes muscle fibers
neurotransmitter chemical that an axon end secretes to stimulate a muscle fiber to contract or a neuron to fire an impulse
origin end of a muscle that attaches to a relatively immovable part
oxygen debt the amount of oxygen required after physical exercise to convert accumulated lactic acid to glucose
prime mover muscle responsible for a particular body movement
recruitment increase in number of motor units activated as stimulation intensity increases
sarcomere the structural and functional unit of a myofibril
synergist a muscle that assists the action of a prime mover
threshold stimulus stimulation level that must be exceeded to elicit a nerve impulse or a muscle contraction