Shared Flashcard Set

Details

Muscle
Muscle Characteristics
41
Anatomy
Undergraduate 1
03/23/2012

Additional Anatomy Flashcards

 


 

Cards

Term
Extensiblity
Definition
The characteristic that allows muscles to be extended or shortenend.
Term
Excitablity
Definition
The enviorment changes and then the muscles respond.
Term
Contractcility
Definition
The trait that sets muscles apart from other tissue.
Term
Irriability
Definition
Another word for Excitability: The enviorment changes and then the muscle responds.
Term
Endomysium
Definition
The reticular fibers that surround individual muscle fibers.
Term
Sarcoplasm
Definition
Cytoplasm for muscle cells.
Term
Titin
Definition
Helps actin recoil.
Term
Sarcomeres
Definition
The fuctional unit of muscles
Term
Action Potential
Definition
The system of message transmission.
Term
Twitch
Definition
Type of contraction represented by a single stimulus/contraction/relaxation sequence
Term
Incomplete tetanus
Definition
A muscle producing peak tensions with visible relaxation during rapid cycles of contraction and relaxation 
Term
Complete tetanus
Definition
A muscle that is stimulated so frequently that the relaxation phase is completely eliminated
Term
Wave summation
Definition
When a muscle is stimulated repeatedly for several seconds with a constant stimulus, the amount of tensions gradually increases to a maximum. 
Term
Excitability
Definition
Ability to receive and respond to a stimulus 
Term
Contractility
Definition
Ability to shorten forcibly when adequately stimulated
Term
Extensibility
Definition
Ability to be stretched or extended
Term
Elasticity 
Definition
Ability of a muscle to resume its resting length after being stretched 
Term
Isotonic contraction 
Definition
Contraction of muscle during which the muscle changes in length and the tension remains constant through most of the contractile period 
Term
Isometric contraction 
Definition
Contraction of muscle during which the tension continues to increase but the muscle neither shortens nor lengthens 
Term
Concentric contraction 
Definition
Contraction of the muscle in which the muscle shortens and does work
Term
Eccentric contraction
Definition
Contraction of muscle in which the muscle contracts as it lengthens 
Term
Cramp 
Definition
Sustained spasm, or tetanic contraction
Term
Fibromyositis
Definition
Inflammation of a muscle, its connective tissue coverings and tendons, and capsules of nearby joints 
Term
Myalgia 
Definition
Muscle pain resulting from any muscle disorder 
Term
Strain
Definition
Excessive stretching and possible tearing of a muscle caused by muscle overuse or abuse 
Term
Action potential
Definition
Propagation of an electrical current along the sarcolemma 
Term
Resting potential
Definition
The initial polarized state
Term
Repolarization
Definition
Restoration of membrane potential to resting potential
Term
Refractory period
Definition
The time when fiber cannot be stimulated until repolarization is complete
Term
End plate potential
Definition
Electrical event occurring only at neuromuscular junction 
Term
Electrical conditions of a resting sarcolemma
Definition
Outside positive relative to the inside 
Term
Depolarization and generation of action potential
Definition
Production of an end plate potential at the motor end plate and consequent depolarization of adjacent areas
Term
Propagation of the action potential
Definition
Increased positive charge inside sarcolemma changes permeability of adjacent areas, opening voltage-regulated Na+ channels 
Term
Repolarization
Definition
Change in sarcolemma after the wave of depolarization; Na+ channels close and K+ channels open, allowing K+ to create a positive charge outside the membrane
Term
tone
Definition
means a continued mild or partial contraction of an entire muscle is muscle
Term
Lactic acid
Definition
increases in quantity during repetitive muscle contraction
Term
peristalsis
Definition
The alternating contraction and relaxation of opposing layers of smooth muscle
Term
True or False: In the initial stages of repolarization, the ionic conditions are restored, returning the membrane to its resting potential.
Definition
False: In the initial stages only, the electrical conditions are restored. Ions are left unbalanced.
Term
True or False: Below-threshold stimuli results in only a small amount of muscle response movement.
Definition
False: Below-threshold stimuli no muscle response occurs.
Supporting users have an ad free experience!