Muscular / Skeletal System Flashcards
connective tissue that is softer and more flexible than bone
cartilage
formed by ossification
two types: compact and spongy
bone
canals found in compact bone
Haversian canals
cells that build bone
osteoblasts
cells that break down old bone
osteoclasts
skeleton that includes: skull, vertebral column, and rib cage
axial skeleton
skeleton that includes: bones of appendages (arms and legs), and the pectoral and pelvic girdle
appendicular skeleton
point at which bones come together
joints
secretions lubricates joints
lines the capsule
synovial membrane
if joints are not properly lubricated, ________ occurs
Arthritis
connect bones to bones
ligaments
connect muscle to bone
tendons
point of attachment of a muscle to a stationary bone
origin
point of attachment of a muscle to a bone the moves
insertion
indicates a straightening of a joint
extension
refers to a bending of a joint
flexion
site of bone cell formation
bone marrow
three types of muscle
smooth
cardiac
skeletal
type of muscle in the digestive system
involuntary
autonomic nervous system
not striated
smooth muscle
type of muscle in the heart
involuntary
autonomic system
striated
cardiac muscle
type of muscle connected to bones
voluntary
somatic nervous system
striated
skeletal muscle
anatomy of a muscle
sarcomere»_space;> myofibril»_space;> fiber»_space;> bundle»_space;> muscle
contractile unit of a muscle
composed of thick (myosin) and thin (actin) filaments that slide past each other
composed of Z lines, M lines, I band, H zone, and A band
sarcomere
Individual muscle fibers exhibit a(n) ____________ response and will only be stimulated by a threshold intensity stimulus.
all-or-none
part of sarcomere that gets shorter during contraction
contains the Z-band
no myosin
I band and H-band
cytoskeletal element of sarcomere
holds actin together
Z lines
area of sarcomere that does not contain actin
H-band
part of sarcomere that contains myosin
does not get shorter during contraction
A band
includes the sarcomere
enveloped by a modified endoplasmic reticulum that stores Ca 2+ ions (sarcoplasmic reticulum)
Myofibril
modified ER that store Ca 2+ ions
envelopes myofibrils
sarcoplasmic reticulum
