The human body has various defense mechanisms to protect itself from infection.
The table below lists several cells, structures, and molecules involved in the human immune response.
| Letter | Cell, structure, or molecule |
|---|---|
| A | antibodies |
| B | B-lymphocytes |
| C | ciliated epithelium |
| D | histamine |
| E | keratinocytes |
| F | memory cells |
| G | macrophages |
| H | mucus |
Which letter or letters indicate structures or secretions that act as primary defenses to prevent the entry of pathogens into body tissues?
Which letter or letters indicate cells capable of performing phagocytosis?
Which letter or letters indicate molecules that specifically bind to antigens on pathogens to neutralise them or mark them for destruction?
During an inflammatory response, mast cells release histamine and cytokines. State the role of each of these molecules:
A person is bitten by a dog suspected of having rabies. They are immediately given an injection of rabies immunoglobulin (pre-formed antibodies). Which type of immunity is functioning when the patient is given the rabies immunoglobulin injection? Select from: natural active, natural passive, artificial active, or artificial passive.
Explain your answer to part (i).
40 exam-style questions on OCR A A Level Biology Communicable diseases, disease prevention and the immune system. Each one has a worked solution and a mark scheme showing where the marks go.