Edexcel B1 Topic 2 Controlling an Internal Environment

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Topic 2 Responses to a changing environment
2.1 Define homeostasis as the maintenance of a stable internal environment
2.2 Demonstrate an understanding of the homeostatic mechanisms of:
a thermoregulation and the effect of temperature on enzymes
b osmoregulation
c blood glucose regulation
B1: Influences on life
2.3 Explain how thermoregulation takes place, with reference to the function of the
skin, including:
a the role of the dermis ­ sweat glands, blood vessels, nerve endings, hair, erector
muscles and sebaceous glands
b the role of the hypothalamus ­ regulating body temperature
2.4 Explain how thermoregulation takes place, with reference to:
a vasoconstriction
b vasodilation
c negative feedback
2.5 Recall that hormones are produced in endocrine glands and are transported by the
blood to their target organs
2.6 Explain how blood glucose levels are regulated by insulin and excess blood glucose
is converted to glycogen in the liver
2.7 Explain how blood glucose levels are regulated by glucagon causing the conversion
of glycogen to glucose
2.8 Recall that Type 1 diabetes is caused by a lack of insulin
2.9 Explain how Type 1 diabetes can be controlled, including the roles of diet and
injection of insulin usually into the subcutaneous fat
2.10 Explain how, in Type 1 diabetes, the level of physical activity and diet affect the
amount of insulin required
2.11 Recall that Type 2 diabetes is caused by a person becoming resistant to insulin
2.12 Explain how Type 2 diabetes can be controlled by diet and physical activity
2.13 Evaluate the correlation between obesity (including calculations of BMI) and
Type 2 diabetes
2.14 Explain how plant growth substances (hormones) bring about:
a positive phototropism in shoots
b positive gravitropism (geotropism) in roots
2.15 Explain how auxins bring about shoot curvature using cell elongation

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Investigate tropic responses
2.17 Analyse, interpret and evaluate data from plant hormone experiments, including
the action of auxins and gibberellins
Unit B1: Influences on life
2.18 Demonstrate an understanding of the uses of plant hormones, including:
a selective weedkillers
b rooting powder
c seedless fruit
d fruit ripening
2.19 Recall that the central nervous system consists of the brain and spinal cord and
is linked to sense organs by nerves
2.20 Explain the structure and function of Dendron and axons in the nervous system
2.…read more

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