Cell Specialisation + Maths Flashcards
(11 cards)
Epithelial tissues structure and function
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
Stomach structure
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
Leaf structure
- 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
What is Digestive system made up of ?
- salivary glands, oesophagus, stomach, duodenum,ileum, pancreas and liver
Epithelial cell in small intestine
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
How to calculate dilution ?
Desired Volume / stock conc X desired conc = volume of solute you need
Total desired volume - volume of solute = volume of water needed
What affects the accuracy of measurement in volume ?
The larger the volume= the less accurate the measurement is
What is serial dilution ? How does it work ?
By making first desired solution with known dilution factors, then continue take some solution from the first one made to make the second dilution and so on
E.g. x10 -> x100 -> x1000 -> x10000
How to calculate uncertainty from measurement of volume ?
If provided to nearest 0.5cm3 = resolution not uncertainty
Uncertainty = resolution of each gradation / 2
How to Percentage uncertainty ?
Uncertainty / measured volume x100
How to reduce uncertainty ? (2)
1) use more precise equipment
2) use a larger volume measured
