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2.6
2.6.6 - 2.6.8- Tissue
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Main types of tissue:
Connective
Muscle
Epithelial
Nervous
Specilised cell : tissue : organ : organ system : organism
Connective
tissue:
provides
support
and
structure
found in the
skin
,
bones
, and
blood vessels
Types of cartilage:
Hyaline
: forms embryonic skeleton and covers end of adult bonds, found in the nose and trachea
Fibrous
: found in discs between vertebrae and in the knee joint
Elastic
: found in the outer ear and form the epiglottis (in the back of throat)
In the cartilage there’s
chondroblasts
which form an extra
cellular matrix
and then enter
G0
,
chondrocytes
then maintain the
matrix.
3 types of muscle tissue:
cardiac
skeletal
smooth
Cardiac muscle
makes up walls of the
heart
looks
striated
cross links allow
contraction
muscle movement is
involuntary
Skeletal:
connected to bones by
tendons
looks
striated
contracts
in
1
direction only
voluntary
movement
Smooth
:
found in
intestine
,
uterus
,
bladder
Not
striated
tapers
away to form a
point
propels
substances
along
involuntary
Epithelial
tissue is a type of tissue that covers the
outside
of the body and lines the
inside
of the body:
squamous
close
together
No
blood
vessels
has projections-
villi
and
cillia
3 main types of plant tissue:
epidermal
vascular
meristematic
epidermal tissue is the
outer
layer of the leaf
epidermal tissue is the outer layer of the leave:
squamous
has a waxy cuticle- decrease water lost
vascular
tissue make up the
xylem
an
phloem
which togther are called the
vascular bundle.
meristemtic tissue
contains
stem cells
found in
roots
and
shoots
Doesnt contain
chloroplasts
has little
celluse
to allow space to grow
Plant organs
flowers-
sexual reprodution
leaves-
photosynthesis
stem-
supports- transport- storage
roots-
absorbs water, minerals and acts as an anchor
organ is a collection of tissues that work togther to perform a job or function- 11 organ systems in the human body
Key organ system examples:
nervous
respiratory
digestive
circulatory
excretory