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Leaving Cert Biology: Endocrine system

How often Endocrine system comes up on the Biology papers, every year it was asked, and questions to try.

HL Asked on 6 of the last 10 Higher Level papers, most recently in 2026. most years

OL Asked on 8 of the last 10 Ordinary Level papers, most recently in 2026. most years

June 2027 is the first exam on the new Biology course. These come from the 2016–2026 papers, so read them as a guide.

Endocrine system, Higher Level(6 marks)

Quick ones on Endocrine system.

(a)Hormone that lowers blood glucose?
  1. Adrenaline
  2. Insulin
  3. Thyroxine
(b)Hormone preparing the body for fight or flight?
  1. Oestrogen
  2. Insulin
  3. Adrenaline
(c)Swelling of the thyroid due to lack of iodine?
  1. Goitre
  2. Rickets
  3. Diabetes
Show the answers

(a) Insulin

(b) Adrenaline

(c) Goitre

Your turn: Higher Level questions on Endocrine system.

Higher Level

Asked on 6 of the last 10 Higher Level papers, most recently in 2026. most years

Every paper, year by year

YearWhere it came up
2026Q7
2025Not asked
2024Q16
2023Q17
2022Not asked
2021Q6
2019Q14
2018Q6, Q14
2017Not asked
2016Not asked

Links open the State Examinations Commission’s paper for that year.

More Endocrine system questions

Endocrine system, 2 marks

Banned drugs, based on testosterone, that athletes use to build muscle?

  1. Antibiotics
  2. Antihistamines
  3. Anabolic steroids
Show the answer

Anabolic steroids

Hormonal manipulation in sport is illegal and harmful, e.g. liver damage and infertility. Hormones are also used legally in medicine and agriculture.

Endocrine system, 2 marks

Hormone injected by people with type 1 diabetes?

  1. Oxytocin
  2. Insulin
  3. Adrenaline
Show the answer

Insulin

The pancreas makes too little insulin, so blood glucose stays high. Insulin injections are a hormonal manipulation used in health.

Ordinary Level

Asked on 8 of the last 10 Ordinary Level papers, most recently in 2026. most years

Every paper, year by year

YearWhere it came up
2026Q17
2025Q3, Q6
2024Q17
2023Q17
2022Q6
2021Q14
2019Q14
2018Not asked
2017Not asked
2016Q12

Links open the State Examinations Commission’s paper for that year.

More Endocrine system questions

Endocrine system, 2 marks

Which hormone lowers the level of glucose in the blood?

  1. Adrenaline
  2. Thyroxine
  3. Insulin
Show the answer

Insulin

Insulin is made by the pancreas after a meal and makes the liver and muscles take glucose out of the blood.

Endocrine system, 2 marks

Which gland produces adrenaline?

  1. The pituitary gland
  2. The adrenal gland
  3. The thyroid gland
Show the answer

The adrenal gland

The adrenal glands sit on top of the kidneys. Adrenaline prepares the body for fight or flight.

Endocrine system, 2 marks

Which disorder is caused by a lack of insulin?

  1. Diabetes
  2. Anaemia
  3. Scurvy
Show the answer

Diabetes

Without insulin the blood glucose stays too high and sugar appears in the urine. It is treated with injected insulin and a controlled diet.

Other Biology topics

All of Leaving Cert Biology