Cell Specialisation

Question 1

Epithelial tissues structure and function

Answer 1

found in animals, consist of sheet of cells
- line the surfaces of organs, have protective or secretory function
E.g. thin, flat cells for diffusion- alveoli of lungs
- Cilia used to move mucus over the epithelial surface

Question 2

Stomach structure

Answer 2

Made up of tissues : 1) muscle to churn and mix stomach contents. 2) epithelium to protect stomach wall and produce secretion 3) connective tissues to hold together other tissues

Question 3

Leaf structure

Answer 3

• palisade mesophyll- made of leaf palisade cells that carry out photo.
• spongy mesophyll for gaseous diffusion
• epidermis to protect leaf + allow gaseous diffusion
• phloem to transport organic materials AWAY from leaf
• xylem to transport water and ions INTO leaf

Question 4

What is Digestive system made up of ?

Answer 4

• salivary glands, oesophagus, stomach, duodenum,ileum, pancreas and liver

Question 5

Epithelial cell in small intestine

Answer 5

F: absorb food efficiently
- walls contain villi to increase SA for absorption
- it folds in their cell membrane called microvilli, it increases SA more
- lots of mitochondria to provide energy for transport of digested food molecules into cell