Online Test — Chemical Coordination and Integration
15 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 15
Coordination using chemical messengers is done by the:
Nervous system
Endocrine system
Skeletal system
Muscular system
Explanation: The endocrine system coordinates using hormones.
Question 2 of 15
A hormone is carried from a gland to its target by the:
Nerves
Blood
Bones
Air
Explanation: Hormones travel in the blood to their targets.
Question 3 of 15
Endocrine glands are called ductless because they:
Have many ducts
Release hormones directly into blood
Make bile
Store fat
Explanation: They release hormones directly into the blood, without ducts.
Question 4 of 15
Compared with nervous control, hormonal control is:
Faster and shorter-lasting
Slower and longer-lasting
Electrical
Instant and brief
Explanation: Hormonal effects are slower to start but last longer.
Question 5 of 15
The 'master gland' is the:
Thyroid
Pituitary
Pancreas
Adrenal
Explanation: The pituitary controls many other glands — the master gland.
Question 6 of 15
Thyroxine, which controls metabolism, is made by the:
Thyroid gland
Pituitary gland
Pancreas
Ovary
Explanation: The thyroid gland makes thyroxine (needs iodine).
Question 7 of 15
Insulin and glucagon, which control blood sugar, are made by the:
Liver
Pancreas
Adrenal gland
Thyroid
Explanation: The pancreas makes insulin and glucagon.
Question 8 of 15
The 'fight-or-flight' hormone is:
Insulin
Adrenaline
Thyroxine
Oestrogen
Explanation: Adrenaline, from the adrenal gland, prepares the body for emergencies.
Question 9 of 15
The male sex hormone made by the testes is:
Oestrogen
Testosterone
Insulin
Adrenaline
Explanation: The testes make testosterone.
Question 10 of 15
Growth hormone is secreted by the:
Pituitary gland
Pancreas
Adrenal gland
Ovary
Explanation: The pituitary makes growth hormone.
Question 11 of 15
A hormone affects only its target organ because those cells have matching:
Ducts
Receptors
Enzymes only
Vacuoles
Explanation: Target cells carry specific receptors that fit the hormone.
Question 12 of 15
Too little insulin (or poor response to it) causes:
Goitre
Diabetes mellitus
Dwarfism
Anaemia
Explanation: Lack of effective insulin causes diabetes mellitus.
Question 13 of 15
Goitre (thyroid swelling) is usually caused by a lack of:
Iron
Iodine
Calcium
Sodium
Explanation: Iodine deficiency causes goitre; iodised salt prevents it.
Question 14 of 15
Too little growth hormone in childhood causes:
Gigantism
Dwarfism
Diabetes
Goitre
Explanation: A shortage of growth hormone in childhood causes dwarfism.
Question 15 of 15
The amount of each hormone is kept in balance by:
Feedback control
Digestion
Breathing
Reflexes
Explanation: Feedback mechanisms keep hormone levels balanced.