A 15-year-old girl presented to the Accident & Emergency Department with a history of prolonged wheezing for the past 36 hours. She has never smoked but has a history of 'wheezy bronchitis' as a child and eczema as an infant. On examination, she was tired and unwell, with a rapid respiratory rate (20/min) and tachycardia (140/min). A diagnosis of bronchial asthma was made.
1. Draw the structure of an antibody.
2. Classify antibodies and discuss each class briefly.
3. Describe the role of B cells and mast cells in an allergic reaction. In your answer name the class of antibody involved and discuss both the sensitisation and effector phases of the response.

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What is the first question you need help with, and what answers have you come up with so far?

You can most likely find this in your text or Google the topics.