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45 Cards in this Set

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  • Back
zygote
fertilized egg
cleavage
numerous cell divisions no cellular growth
holoblastic cleavage
the entire egg divides
meroblastic cleavage
the egg divides only in a small area where the original nucleus was located
morula
a solid ball of cells possesing no central cavity (cell growth has taken place)
embryo
what an organism is called in its early stages of development
blastula
hollow ball
blastocoel
central cavity of blastula
gastrula
stage of embryonic dev. where a side of the blastula begins to push inward
blastopore
opening to the gastrocoel
fetus
occurs after an embryo and prior to birth
ectoderm
cells on outside of body
sense organs
CNS
endoderm
part of digestive tract
part of respiratory tract
inferior parts of urinary system
mesoderm
the skeleton
muscles
circulatory system
reproductive system
superior parts of urinary system
chorion (membrane of embryo)
outer membrane, gives rise to placenta
amnion (membrane of embryo)
thin membrane, amniotic fluid serves as shock absorber for the embryo
allantois (membrane of embryo)
blood vessels of the allantois help form umbilical cord
osteoblast
an immature bone cell
osteocyte
a mature bone cell
what is responsible for secreting matrix
osteoblast
concentric rings of osteoblasts
form around blood vessels in developing bone
what is hardened matrix
osteocyte
eat old bone tissue
osteoclast
matrix
any intercellular substance that is secreted by the cell
ossification
process by which bones are formed
3 ways bones are created
1. achondral- no carilage
2. exochondral- bone replace carilage from outside in
3. endochondral- bone replace cartilage from inside out
phagocytosis
process by which cartilage is removed
periosteum
tough connective tissue surrounding most bones
lacuna
pocket around osteocyte formed by intercellular matrix hardening
haversian system
concentric rings of lacuna containing osteocytes surrounding a haversian canal
lamellae
"thick" concentric rings of bone tissue (b/t lacuna)
haversian canal
connected transversly thru volkmann's canal
bones in body
about 206
compact bone
dense arrangement of bony tissue
spongy bone
construcion of many small, splinter like irregular rods
5 functions of skeletal system
1. support
2. protection
3. muscle attachment/leverage
4. blood formation
5. mineral salt storage
epiphasis
expanded portion at end of long bones
diaphysis
shaft portion of bones
red marrow
functions in RBC & some WBC formation
white marrow
functions as fat storage tissue
epiphyseal plate
growth plate
aponeurosis
a wide, flat, sheet-like tendon
fibrous membrane
helps to hold the joint together
synovial membrane
secrets synovial fluid
synovial fluid
lubricates joints to reduce friction also nourishes articular cartilage