How do hormones travel round the body?

in the blood. They are released into the blood by glands.

Which gland makes insulin?

pancreas. Insulin lowers the blood glucose concentration.

Which hormone is released when you are frightened?

adrenaline. It prepares the body for "fight or flight".

Which statement about hormones is correct?

Their effects usually last longer than those of nerves. They are slower to act but longer-lasting.

Where is testosterone made?

testes. It causes the changes in boys at puberty.

Hormones · Edexcel IGCSE Science (Double Award) revision

In plain words

Not every message in the body goes by nerve. Some are sent as chemicals released into the blood by glands. They travel everywhere but only affect the organs built to respond. They're slower than nerves, and their effects last longer.

Three things to know

A hormone is a chemical made by a gland and carried in the blood, which changes the activity of one or more target organs.
Adrenaline (adrenal glands) prepares the body for action: faster heart and breathing, wider pupils. Insulin (pancreas) lowers blood glucose. Testosterone (testes) and oestrogen (ovaries) are the sex hormones.
Compared with nerves, hormones are slower to act, travel in the blood rather than along neurones, and have effects that last longer.

Tips and tricks

The definition has three parts: made by a gland, carried by the blood, affects a target organ.
Adrenaline is "fight or flight": everything it does gets more oxygen and glucose to the muscles.

5 questions, about 2 minutes.

It lands in your notebook with its questions as flashcards.

Hormones: 5 questions and answers

These are the quiz’s questions. Do the quiz first, then come back here for the ones that got you.

How do hormones travel round the body?
- along nerves
- in the blood (the answer)
- through the gut
- in the lymph only
They are released into the blood by glands.
Which gland makes insulin?
- adrenal gland
- thyroid
- pancreas (the answer)
- ovary
Insulin lowers the blood glucose concentration.
Which hormone is released when you are frightened?
- insulin
- adrenaline (the answer)
- oestrogen
- ADH
It prepares the body for "fight or flight".
Which statement about hormones is correct?
- They act faster than nerves.
- Their effects usually last longer than those of nerves. (the answer)
- They are electrical signals.
- They are carried by neurones.
They are slower to act but longer-lasting.
Where is testosterone made?
- ovaries
- testes (the answer)
- pancreas
- pituitary
It causes the changes in boys at puberty.

5 questions

Tap an answer and you’ll see straight away whether it’s right, and why.

Worksheet

3 questions, 8 marks. Write your answers on paper, then check them.

Hormones

Edexcel International GCSE Science (Double Award) 4SD0 · 8 marks · papermunch.org

Name ______________________________ Date ______________

State what is meant by a hormone.[3]
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A chemical substance produced by a gland and carried by the blood, which alters the activity of one or more specific target organs.
I got this one
State three effects of adrenaline on the body.[3]
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Any three: increases heart rate, increases breathing rate, widens the pupils, increases the concentration of glucose in the blood.
I got this one
Give two differences between nervous control and hormonal control.[2]
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Nervous control is faster and its effects are shorter-lived; nerve impulses are electrical and travel along neurones, while hormones are chemicals carried in the blood.
I got this one

Answers: Hormones

1. A chemical substance produced by a gland and carried by the blood, which alters the activity of one or more specific target organs.
2. Any three: increases heart rate, increases breathing rate, widens the pupils, increases the concentration of glucose in the blood.
3. Nervous control is faster and its effects are shorter-lived; nerve impulses are electrical and travel along neurones, while hormones are chemicals carried in the blood.