Tissue and organs

Question 1

name the 5 layers (from the outside in) of the alimentary canal in the ileum.

Answer 1

Serosa-Thin protective and supportive layer
Muscularis externa- Contractions of longitudinal muscle=pendular movement, contractions of circular muscle=local constrictions for peristalsis
submucosa-connective tissue containing blood cells which transport absorbed food products
muscularis mucosa- surface with thin layer of muscles extending up into villi, and contract to control the wafting movement
mucosa- surface with villi

Question 2

Villi

Answer 2

Columnar epithelial cells=  many mitochondria and secrete enzymes 
Goblet cells= secrete mucus 
Crypts of Lieberkoohn=produce new epithelial cells 
Paneth cells= anti-microbial role

Question 3

name the 4 layers (top to bottom) of a leaf

Answer 3

Upper epidermis= transparent, waxy cuticle. protective role.
Palisade mesophyll-photosynthesizing region. Arranged regularly to contain as many as possible.
Spongy mesophyll-Gaseous exchange cells like xylem and ploem
Lower epidermis- Stomata= pores to allow exchange of gas Guard cells= turgid, open the stomata up, when flaccid, they close the stomata.