- Created by: Say_kaa
- Created on: 22-04-21 03:19
Hormones: substances that stimulate target cells via the blood
→ released directly into the blood plasma from endocrine glands
- produces slow, long-lasting & widespread responses
The endocrine system contains several different glands = each gland secretes different chemicals called hormones directly into the bloodstream.
Hormones travel in the blood to a specific/target organ or receptor & bring about a response. The response becomes a long-term change.
The pituitary gland
- in the brain
- secretes several hormones (reproductive hormones) => Follicle-stimulating hormone (FSH) & Luteinising hormone (LH).
The thyroid gland
- located in the front of the neck below the larynx
- releases a hormone called thyroxin => helps to regulate the basal metabolic rate.
- islets of Langerhans: groups of hormone-secreting cells: a cells => glucagon b cells => insulin
The adrenal glands