supplying the cell b2.1
- Created by: faiqa1331
- Created on: 11-10-18 05:49
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- supplying the cell b2.1
- diffusion (b2.1.1)
- passive
- movement of particles from an area high concentration to an area of low concentration
- rate increased by:
- short diffusion distance
- higher concentration gradient
- larger surface area
- osmosis (b2.1.2)
- movement of water molecules from an area of high concentration to an area of low concentration
- across a partially permeable membrane
- example:water into root hair cells
- active transport (b2.1.3)
- requires energy (atp)
- movement of molecules against a concentration gradient
- lots of mitochondria is needed
- you get the atp from respiration
- mitosis (b2.1.4)
- method by which cells replicate
- body cells divide into to genetically idenical daughter cells
- 1) interphase:
- the dna replicates
- other oraganells replicate
- the cells grow bigger
- 2) mitosis
- i) the chromosomes line up in the middle of the cells
- ii) the chromosomes are pulled to opposite ends
- iii) two new nuclei are formed which will 46 chromosomes each
- 3) cytokenis
- i) the cell membrane pinches in and two new daughter cells are made
- ii) the daughter cell will now grow and perform mitosis
- cell differentiation (b2.1.5)
- sperm cell
- tail = swim
- mitochondria = energy
- acrosome = enzymes to digest cell membrane
- fat cell
- small cytoplasm = large fat reserve
- red blood cell
- no nucles
- biconcave
- lots of haemoglobin
- carries oxygen
- cilliated cell
- the cilia = move substances along
- sperm cell
- stem cell (b2.1.6)
- undifferentiated cells
- divide for growth or repair
- plants
- found in meristems
- animals
- embryonic
- found in embryo
- can differentiate into all cells
- adult
- found in body tissue
- can differentiate into some cells
- embryonic
- diffusion (b2.1.1)
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