describe the principles of hormonal coordination and control by the human endocrine system
use of chemical messengers, transport in blood, endocrine glands and receptors
describe the principles of hormonal coordination and control by the human endocrine system
use of chemical messengers, transport in blood, endocrine glands and receptors
**explain the roles of thyroxine and adrenaline in the body
thyroxine as an example of a negative feedback system**
describe the role of hormones in human reproduction including the control of the menstrual cycle
oestrogen, progesterone, FSH and testosterone
explain the interactions of FSH, LH, oestrogen and progesterone in the control of the menstrual cycle
explain the use of hormones in contraception and evaluate hormonal and non-hormonal methods of contraception
relative effectiveness of the different forms of contraception
explain the use of hormones in modern reproductive technologies to treat infertility
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
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
**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**