1. tissues
& organs
the ileum
the leaf

2. organ system cells tissue organ palisade mesophyll palisade cells
Group of cells carry out same functions
Group of tissues carries out one or ore function
Group of organs work together to carry out function
palisade
mesophyll
palisade
cells
spongy
cells
spongy
mesophyll
leaf
Photosynthesis
Transpiration
epidermal
cells
epidermis
xylem
vessels
vascular
bundles
sieve tubes
companion
cells

3. organ system cells tissue organ blood lymph circular muscle ileum
Group of cells carry out same functions
Group of tissues carries out one or ore function
Group of organs work together to carry out function
blood
lymph
circular
muscle
Complete digestion
Absorb digested food
Move undigested food to colon
ileum
muscle
cells
longitudinal
muscle
columnar
epithelial
cells
epithelium
goblet
cells
connective

4. lumen cs ileum outer serosa Connective tissue
Very thin protective & supportive
muscularis externa
Outer longitudinal muscle:
pendular movements
Inner circular muscle:
local constrictions &
peristalsis
Churn & mix food
mucosa
In contact with food
Highly specialised
to increase SA
Villi & microvilli
lumen
submucosa
Connective tissue/
blood vessels/
lymphatic tissue
Transport absorbed food
muscularis mucosa
Thin layer muscle extends into centre villi
Moves villi to increase contact with food in lumen

5. structure of a villus Goblet cells: Columnar epithelial cell:
Secretes mucus
Protects lining against enzyme digestion
& lubricates to facilitate movement
The inner layer of epithelial cells
is highly folded & has specialised cells:
Columnar epithelial cell:
Microvilli, increase SA for enzyme attachment
Mitochondria, energy, AT
Together the microvilli form
a Brush border
Crypt of Lieberkuhn gland:
Cells at base continually divide by mitosis & move up the surface
to replace cells that are sloughed off
Paneth cells have an antimicrobial function, protecting cell neighbours

6. absorption antibodies in babies glucose & aas glycerol & fatty acids
Pinocytosis
antibodies
in babies
lacteal
AT &
Facilitated Diff
glucose
& aas
glycerol &
fatty acids
Simple diffusion
Capillary network
Lymph vessels

7. tissue layers muscosa lacteal muscularis mucosa submucosa
circular muscle
muscularis externa
longitudinal muscle
serosa