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B1 Chapter 2 Continued- Coordination and Control (Hormones And Control Of…
B1 Chapter 2 Continued- Coordination and Control
Controlling Conditions
Body controls internal environment
Water content
Water always leaving body-sweat, breathing out
Lose excess water in urine-produced by kidneys
Ion content
Lose ions in sweat and urine
Temperature
Must keep constant
Enzymes wont work properly if not controlled
Blood sugar level
Energy source for cells
Controlled by panceas
Hormones And Control Of Growth
Plants sensitive to light gravity and moisture
Phototropism-Shoots grow towards light
Gravitropism-Roots grow towards gravity
Roots also grow towards water
Auxins-Hormone controls gravitropism and phototropism
Unequal distribution-unequal growth
Bending of shoot or root
Plant growth hormones used as weed killers and to stimulate root growth
Using Hormones
Women
Contraceptive pill -prevents unwanted pregnancies
Hormones also help pregnancy
Older women have babies
Side effects in some women
Plants
Used by farmers and gardeners
Weedkillers
Encourage roots to grow before cuttings planted
Encourage fruit to ripen
Can cause damage to environment