1. Insulin is produced by an endocrine gland and is transported in the blood - Edexcel - GCSE Biology - Question 1 - 2018 - Paper 1
Question 1
1. Insulin is produced by an endocrine gland and is transported in the blood.
(a) (i) Which row shows the endocrine gland and the target organs for insulin?
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Worked Solution & Example Answer:1. Insulin is produced by an endocrine gland and is transported in the blood - Edexcel - GCSE Biology - Question 1 - 2018 - Paper 1
Step 1
Which row shows the endocrine gland and the target organs for insulin?
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Answer
The correct answer is C: pancreas, liver and muscles. Insulin is produced by the pancreas, which is an endocrine gland, and its main target organs are the liver and muscles.
Step 2
Which part of the blood transports insulin to its target organs?
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Answer
The correct answer is A: plasma. Insulin is dissolved in the plasma and transported to its target organs through the bloodstream.
Step 3
Explain why the blood glucose concentration then decreases.
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Answer
After a meal, the blood glucose concentration increases due to the intake of carbohydrates. Subsequently, insulin is released into the bloodstream by the pancreas. Insulin facilitates the uptake of glucose by body cells, particularly in the liver and muscles, where it is either used for energy or stored as glycogen. This decreases the concentration of glucose in the blood.
