GCSE Biology Specification

OCR A J247

Section B3.2: Coordination and control – the endocrine system

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#B3.2a

describe the principles of hormonal coordination and control by the human endocrine system

use of chemical messengers, transport in blood, endocrine glands and receptors

#B3.2b

explain the roles of thyroxine and adrenaline in the body

thyroxine as an example of a negative feedback system

#B3.2c

describe the role of hormones in human reproduction including the control of the menstrual cycle

oestrogen, progesterone, FSH and testosterone

#B3.2d

explain the interactions of FSH, LH, oestrogen and progesterone in the control of the menstrual cycle

#B3.2e

explain the use of hormones in contraception and evaluate hormonal and non-hormonal methods of contraception

relative effectiveness of the different forms of contraception

#B3.2f

explain the use of hormones in modern reproductive technologies to treat infertility

#B3.2g

explain how plant hormones are important in the control and coordination of plant growth and development, with reference to the role of auxins in phototropisms and gravitropisms

unequal distribution of auxin

#B3.2h

describe some of the variety of effects of plant hormones, relating to auxins, gibberellins and ethene

controlling growth, controlling germination, fruit ripening, flower opening and shedding of leaves

#B3.2i

describe some of the different ways in which people use plant hormones to control plant growth

selective herbicides, root cuttings, seedless fruit (parthenocarpic fruit development), altering dormancy