Web1.2 - Nerves & Hormones. 1.2 - Nerves & Hormones. The nervous system and hormones enable us to respond to external changes. They also help us to control conditions inside our bodies. Hormones are used in some forms of contraception and in fertility treatments. Plants also produce hormones and respond to external stimuli. WebFREE Biology revision notes on Biological Molecules: Key Terms. Designed by the teachers at SAVE MY EXAMS for the AQA A Level Biology syllabus. ... It avoids the nervous system being overwhelmed by impulses. Synapses act as a barrier and slow down the rate of transmission of a nerve impulse that has to travel along two or more neurones;
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