key stage 3 national strategy science pulmonary vein aorta digestive system heart pulmonary artery...
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Key Stage 3 National Strategy Science
pulmonaryvein
aorta
digestivesystem
heart
pulmonaryartery
lungs
liver
kidneys
rest of body
upper limbs and head
The mammalian circulatory system
Slide 3.12
Key Stage 3 National Strategy Science
red bloodcell
white bloodcell
red bloodcell
platelet
red bloodcell
white bloodcell
plasma
red bloodcell
white bloodcell
platelet
Blood cells
Slide 3.14
Key Stage 3 National Strategy Science Slide 4.21
upperepidermis
mesophyll
lowerepidermis
waxcuticle
palisademesophyll
waxcuticle
chloroplast
spongymesophyll
airspace
stoma
guard cell
Diagram of cross-section of a leaf
Key Stage 3 National Strategy Science
nuclearmembrane
Parent cell with 4 chromosomes.
Chromosomes replicate forming pairs of chromatids.
Pairs of chromosomes arrange themselves in the centre of the cell.
The chromosomes separate and move to opposite ends of the cell.
The first cell division occurs.
The chromosomes now separate from each other and move to opposite ends of the cells.
The second cell division occurs.
Sex cell division
Slide 4.29
Key Stage 3 National Strategy Science
Determining sex in humans
Male parent provides sperm with either an X or Y chromosome. Female parent provides eggs with an X chromosome. The possible combinations in the offspring are:
Male parent
Female parent
X
X
X
Y
X
X
X
X
X
X
Y
Y
Slide 4.31