pre Class 11 - intro to muscle structure and function

skeletal muscle functions

-Produces major body movements -Stabilizes body positions -generates heat

troponin

3 subunit complex on the thin filament

electrical excitability

A property of both neurons and muscle cells

thin filament (actin)

What B?

Thick filament (myosin)

What is C?

titin filament

What is the spring like connector of the thick filaments to the Z disc?

sarcomere contraction

What is this stage of myofilament overlap?

sarcomere relaxation

What is this stage of myofilament overlap?

sarcoplasmic reticulum

What's this? -intracellular storehouse of calcium ions

Tropomyosin

blocks myosin binding sites on the thin filament during relaxation

muscle fascicles

bundles of muscle fibers

cardiac muscle function

contractions of the heart create pressure to propel blood through the circulatory system of the boy

Alpha actinin

primary structural protein of the Z-disc

myomesin

primary structural proteins of the M-line

three types of muscle

skeletal, cardiac, smooth

smooth muscle function

storage is accomplished by sustained contractions of ring-like bands of smooth muscle called sphincters

sarcomere

what is A? -contracting subunits making up each myofibril

myofibrils

what is C? -contractile assembly of proteins in a muscle cell

muscle fiber

what is D? -muscle cell

transverse tubules

what's this? -extension of the plasma membrane

Elasticity

Ability of a muscle to return to its original shape after a contraction or extension

Contractability

Ability of muscle to contract forcefully when adequately stimulated

Extensibility

Ability of muscle to stretch without being damaged