B3

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What are hormones?
chemicals secreted by glands.
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How are hormones transported around the body?
in the bloodstream.
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What does the hormone insulin do?
causes glucose to be removed from the blood.
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What is the eye an example of?
A sense organ.
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Which type of neurone transmits a signal from a sense organ to the central nervous system?
Sensory neurones
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Which type of neurone transmits a signal from the central nervous system to an effector, such as a muscle?
Motor neurones
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Compared with nervous responses, hormonal responses are:
slower acting and longer lasting
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According to Darwin's theory of evolution, how do new species evolve?
By natural selection.
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Which individuals are most likely to survive to reproduce?
Individuals that are well suited to their environment
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What is likely to happen to an individual that is poorly suited to its environment?
it will not survive to reproduce.
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What type of variation is inherited?
Genetic variation.
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Why do we have a good evolutionary record of the horse?
because the fossil record of its ancestors is complete.
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Why are white peppered moths likely to be more common than black ones in country areas?
because it is more difficult for birds to see them on clean birch bark.
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Other cards in this set

Card 2

Front

How are hormones transported around the body?

Back

in the bloodstream.

Card 3

Front

What does the hormone insulin do?

Back

Preview of the front of card 3

Card 4

Front

What is the eye an example of?

Back

Preview of the front of card 4

Card 5

Front

Which type of neurone transmits a signal from a sense organ to the central nervous system?

Back

Preview of the front of card 5
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