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



Contractility The ability of skeletal muscle to shorten with force
Excitability The capacity of skeletal muscle to respond to a stimulus
Extensibility The ability to be stretched
Elasticity ability to recoil to their original resting length
Empimysium Connective tissue sheath surrounding the skeletal muscles
Facia is another connective tissue located outside the epimysium
Fibers faciculi are composed of single muscle cells
Endomysium each fiber is surrounded by loose connective tissue
Myofibrils A thread like structure that extends from one end of the fiber to the other
Actin Myofilaments Thin myofilaments
myosin myofilaments thick myofilaments
sarcomeres are joined end to end
resting membrane potential charge difference across the membrane
action potential brief reversal back to charge
motor neurons a nerve cell that carry action
neuromuscular junction each branch connects to muscle
synapse near the center of the cell
motor unit form a single muscle
presynaptic terminal space between the presynaptic terminal
synaprtic vesicles contains presynaptic terminal
acetylcholine diffuses across synaptic cleft
acetylcholinesterase rapidly broken down by enzymes
sliding filament mechanism sliding of actin myofiliments
muscle twitch contraction of an entire muscle
threshold will not respond to stimulants
all or none response phenomenon
lag phase beginning of contraction
contraction phase time of contraction
relaxation phase time when muscle relaxes
tetany muscle remains contracted
recruitment increase in number of motor units
creatine phosphate can store high energy molecules
anaerobic respiration without oxygen
aerobic respiration with oxygen
oxygen debt amount of oxygen needed for chemical reaction
muscle fatigue used during muscle contraction
isometric length of muscle does not change
isotonic amount of tension produced
Created by: ryansteele