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Describe the coordination of a reflex action.

the receptor detects stimulus. The receptor generates an electrical impulse sent to the CNS by neurons (sensory). Chemical messengers (neurotransmitters) carry the electrical impulse across a synapse. Neurot...
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Answered by Fola O. • Biology tutor
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Describe the differences in structure of arteries, veins and capillaries.

Arteries: carry blood away from the heart, have thick muscular walls, have small lumens, and contains blood under high pressure. Veins: carry blood to the heart, have thin walls, have large lumens, contains ...
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Answered by Mehjaben R. • Biology tutor
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Explain what the reflex arc is, how it is different to how the central nervous system normally works, and how the arc itself works.

To answer this question, you need to know what the reflex arc is and why we need it. The reflex arc is a pathway of neurones (nerve cells) and their connections (synapses) that doesn't go through the conscio...
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Answered by Lana B. • Biology tutor
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Describe how non-specific human defence systems stop you from falling ill. [6 marks]

your skin covers almost all parts of your body to prevent infection from pathogens, your nose has hairs within them which act as a physical barrier to infection, mucus is produced by goblet cells in your nos...
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Answered by Elicia C. • Biology tutor
7977 Views

What is the action of insulin?

Insulin is the hormone that controls how glucose gets into your cells to give them energy after you eat. If you think of your cells having a lock on them and insulin is the key. Once your food is digested, t...
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Answered by Sophie B. • Biology tutor
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