IGCSE Biology - Hormones (14.3)

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Cambridge IGCSE Biology (0610/0970)
Chapter 14 - Coordination and response
Topic 14.3 - Hormones
For exams in 2023, 2024 & 2025 (core and extended)

As always this video follows the Cambridge syllabus exactly and contains absolutely everything you need to know for your final exam!

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@igpecomplete - Cambridge IGCSE PE
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Timestamps:
0:00 Contents
0:31 Hormones
1:24 Endocrine glands
1:50 Role of adrenaline
2:35 Role of adrenaline (extended)
3:17 Nervous vs hormonal control

Core content:
- Describe a hormone as a chemical substance, produced by a gland and carried by the blood, which alters the activity of one or more specific target organs: Hormones are transported to target organs by the circulatory system. They bind to receptor proteins in the cell membrane.
- Identify in diagrams and images specific endocrine glands and state the hormones they secrete, limited to:
(a) adrenal glands and adrenaline
(b) pancreas and insulin
(c) testes and testosterone
(d) ovaries and oestrogen
- Describe adrenaline as the hormone secreted in ‘fight or flight’ situations and its effects, limited to:
(a) increased breathing rate
(b) increased heart rate
(c) increased pupil diameter
- Compare nervous and hormonal control, limited to speed of action and duration of effect

Extended content:
- State that glucagon is secreted by the pancreas
- Describe the role of adrenaline in the control of metabolic activity, limited to:
(a) increasing the blood glucose concentration (b) increasing heart rate