Week One quiz

contractions speed can vary
force generation can vary
innervated by somatic nervous system

origin- muscle attachment to the bone that typically does not move
insertion- muscle attachment to the bone that is moved during contraction
flexors-muscles that decrease joint angles
extensors-muscles that increase joint angles

broad at the origin and then taper to a narrow tendon

fibers form a ring around an opening

fibers are thicker in the middle and they taper at both ends "football shaped"

fibers run parallel to each other with no obivious taper to a tendon

fibers are going to connect obliquely to a tendon in ONE direction

fibers connect obliquely to a tendon in TWO directions feather type orientation

fibers connect obliquely to tendon in mulitple central tendons grouping of feathers but all connect to one stem

bind together muscle fibers
keeos muscles fibers in parallel aligment

surround whole muscle

surrond fascicles

surround muscle fibers

mito have a lot of them for energy
nuclei have multiple in one cell
cell membrane- called sarcolemma in skeletal muscles
cytoplasm- called sarcoplasm

have satellite cells allows for help in muscle growth and repair
-outside the sacrolemma but inside basel lamina
- when muscle grows nucleli as they intergrate into the cell

contain contractile proerties
lots of proteins

net like structure
holds Ca
network of membranous channels that surrounds each myofibrils

continuous with the sacrolemma
meranous channel that enxtends inwards from sacrolemma and passes trhough the fiber

from the actin and myosin

length of mysion and it is the dark band

light band
from the end of one mysin the the start of the next one

helps the strucutre and stability for myosin

holds the z dics

the zig zag of the at the end of actin and between the actin below it

is what aatches actin to the z dics

end of actin to end of actin

middle point of the sacromere

actin not myosin
h zone gets smaller
i band gets smaller
a band stays the same

thin filament
tropnin- balls
tropmysion-rope

tail-heavy chain
heads-hevay chain
2 rings round heads-light chain (helps sturcture and stability)

intermediate filaments that hold adjecnt sacrmeres together z dis to z dics
allows for more power and cohesiveness by having sacromese all aligned

protein tht holds action to the sacrolemma vvery important to organization of sacromeres