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Lab 9 Review
Muscle - Skeletal Muscles
16
Anatomy
Undergraduate 1
11/08/2011

Additional Anatomy Flashcards

 


 

Cards

Term
3 types of Muscles
Definition

Smooth

Cardiac 

Skeletal

Term
Smooth Muscle
Definition
Involuntary
Non-Striated
Uninucleated
Spindle Shaped Cells, form sheets
 
Term
Cardiac Muscle 
Definition
  • Involuntary
  • Striated
  • Uninucleated
  • Intercalated Discs
  • Branching
Term
Skeletal Muscle
Definition
  • Voluntary
  • Striated - caused by alternating light/dark bands
  • Multinucleated - located on the edge of the cell
  • Elongated Cells - Muscle fibers/Myofibers (myo = muscle) 
Term
4 functions of skeletal muscle
Definition
  1. Produces movement
  2. Maintains Posture
  3. Stabilizes Joints
  4. Generates heat
Term
4 Characteristics of Skeletal Muscles
Definition
  1. Excitability – responds to certain stimuli, i.e. chemical neurotransmitters or hormones
  2. Contractility – capacity to shorten and develop tension
  3. Extensibility – capacity to stretch without damaging tissue (flexion/extension – opposing pairs of muscles)
  4. Elasticity – Muscle tissue returns to original shape after contraction or extension

Term

Epimysium

 

Definition

CT surrounding the entire skeletal muscle, connects muscle to the tendon (cord like) or (aponeuroses)

Term
Perimysium
Definition

CT surrounding bundle of fascicles

Term
Endomysium
Definition

CT surrounding individual muscle fibers/cells 

Term
Fascicles 
Definition

made up of bundles of muscle fibers/cells

Term
Myofibril
Definition

bundles make up muscle fiber.  They have alternating dark and light bands.

Term
Sarcromeres
Definition
the smallest contractile unit of muscle; it is the functional unit of skeletal muscle 
Term
Sarcolemma
Definition
Plasma membrane; covers muscle fiber
Term
Sarcoplasmic Reticulum
Definition

(this is the smooth ER of the muscle cell) interconnecting tubules running along the myofibril.  Stores and releases calcium on demand when muscle fiber is stimulated to contract.

Term
Terminal Cisternae
Definition

crosschannels of SR where calcium isreleased into the cytoplasm of the muscle fiber.  These always occur in pairs

Term
T tubule
Definition

continuous with sacrolemma, run between Terminal Cisternae,  transmit the action potential inside the fiber to each sarcomere to signal release of calcium.

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