This diagram covers Endocrine Glands — Adrenaline and Thyroxine within Hormones & Behaviour for GCSE Biology. Topic 8: Hormones & Behaviour It is section 3 of 10 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.
🧬 Endocrine Glands — Adrenaline and Thyroxine
Practice questions for Hormones & Behaviour
Which response does adrenaline prepare the body for?
State two effects of adrenaline on the body during a fight-or-flight response.
Quick recall flashcards
What is adrenaline and what does it do?
Adrenaline is a hormone released by the adrenal glands (on top of the kidneys) during stress or danger. It prepares the body for 'fight or flight' — increasing heart rate and releasing glucose for energy.
Name three effects of adrenaline on the body.
1. Increases heart rate (more blood to muscles).
2. Raises blood glucose levels (provides energy).
3. Dilates pupils and increases breathing rate (heightens alertness).