CAIE IGCSE Biology 14.3 Hormones Questions

Practise hormone questions by defining chemical messengers, matching endocrine glands, comparing control systems and interpreting adrenaline effects.

Exam points

define hormones as gland-produced chemicals carried in blood to alter target-organ activity
identify adrenal, pancreatic, testicular and ovarian glands and match their hormones in diagrams or tables
identify the pancreas as the gland that secretes glucagon
identify adrenaline as the fight-or-flight hormone and state its breathing, heart-rate and pupil effects
explain adrenaline's metabolic role: glycogen breakdown raises glucose for muscle respiration
compare nervous and hormonal control by speed and duration of effect

[Maximum number: 3]

Insulin is a hormone that regulates the concentration of glucose in the blood.

Describe what is meant by the term hormone.

[Maximum number: 1]

Substances move between blood and tissues at various sites in the circulatory system of mammals.

State the name of the organ that releases oestrogen into the blood.

[Maximum number: 1]

Which hormone causes an increase in breathing rate, an increase in heart rate and the widening of pupils?

insulin

adrenaline

oestrogen

testosterone

[Maximum number: 1]

State one difference between nervous and hormonal control systems.

[Maximum number: 1]

Which organ produces glucagon?

adrenal gland

liver

ovary

pancreas

[Maximum number: 3]

Adrenaline also affects blood glucose concentration.

Suggest how this is an advantage for the "fight or flight" response.

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