Introduction
D Cells in animals specialize 31 differentiate ( similar to
plants )
D Tissues in animals are made up of cells that are similar
/
In structure
$ function
D Animals don't have meristem ontic tissue
↳ have stem
They
→ Un
specialised cells
① Adult stem cells
↳ main :
undergo
purpose
↳ Location : bone marrow mitosis
→ has limited specialisation
←
② Embroytic stem cells some of them specialise
↳ Location : Umbilical cord
↳ Unlimited specialisation
humans can 't
ps
q[y5
CD BUT as we
s
.
control what it specialises into
→
W
'
Y o
↳ specialise
, Mammalian tissue (4)
① Epithelium tissue
↳ Create boundaries eg .
surrounding skin 13 kidney
CD simple or stratified
↳ squamous or cuboidal or columnar
② Connective tissue
LD support , protect , join
↳ many different types : solid semi -
solid
Liquid
t t t
bone
cartilage blood
③ Nerve communication
↳ communication
↳ Made up of neurons
④ Muscle
Crs Movement
↳ 3 types :
D cardiac → heart
→ involuntary
D skeletal / striated →
eg .
ar m
→ voluntary
D smooth →
eg
:
digestive → throat
→ involuntary
, Epithelial tissue
Epithelium → noun
Epithelial → adjective
Epithelia → plural
→ Tissue that covers the body
↳ protective function ( creates a boundary
→ Also covers outside of the organ CD sometimes
the inside ) eg
.
stomach
→ Different types
function
→ Named according to or
shape
D No ,
of layers
D shape
D ciliated → has Cillian ( little hairs )
D Glandular
D keratinized
Explanation
D No .
of layers
→
simple I layer
-
→ stratified -
more than I
D shape
]
D squamous
-
squashed
D columnar -
rectangular shape
→ Take from
D cubical cube shape
top layer
-
D Cilliated → has little hairs
iced
D karat in
CD is protein → skin
hair
nails
D Glandular → protein that secrets something