Muscle Flashcards
sliding-filament model
hypothesis that thin filaments (actin) & thick filaments (myosin) slide past one another during contraction
- sliding shortens sacromere
- 1954 - proposed by Huxley & Hanson (individually @ same time)
evidence of sliding filament model of muscle contraction
light & dark bands in sacromere changed when muscles relaxed or contracted
- light bands become narrower
- dark bands no change
types of muscle
(1) cardiac muscle
(2) smooth muscle
(3) skeletal muscle
cardiac muscle
type of muscle
location: heart
function: move food & help regulate blood pressure
properties: involuntary
striated due to sacromeres
smooth muscle
type of muscle
location: intestines, arteries, digestive tract, lungs, etc.
function: pump blood
properties: involuntary
skeletal muscle
type of muscle
location: attached to skeleton
function: move skeleton
properties: voluntary
striated due to sacromeres
level of muscle organization
(1) muscle
(2) muscle fiber/cell
(3) myofibril
(4) sacromere
adenosine triophosphate (ATP)
causes conformational change by releasing head from actin in thin filament
adenosine diphosphate (ADP)
causes myosin neck to straight & head to pivot
- mysosin head bonds to new actin subunit
sacromere
smallest component of muscle
- contractile unit
- Z disc to Z disc
myosin
binding sites on thin filament
tissue
group of cells that function as a unit
types of tissue
(1) epithelial
(2) connective
(3) muscle
(4) nervous
epithelial tissue
tissues that cover or line
connective tissue
if not other 3 tissue then it is connective tissue
(ie) bone tissue & blood cells
