– The Immune System –
The human immune system is a complex network of cells, tissues, and organs that work in harmony to protect the body from harmful pathogens. Functioning as the body’s defense mechanism, it plays a critical role in maintaining health and preventing diseases.
When foreign substances like bacteria, viruses, or toxins invade the body, the immune system springs into action. White blood cells, the soldiers of the immune system, recognize these invaders and initiate a response. Some white blood cells, known as phagocytes, devour the intruders, while others, called lymphocytes, remember the pathogens and enable a faster response in future encounters.
However, the immune system is not infallible. Sometimes, it fails to recognize harmful substances, leading to infections. Alternatively, it might wrongly identify harmless substances as threats, causing allergies. In more severe cases, it can even attack the body’s own cells, leading to autoimmune diseases.
Despite these potential issues, the immune system, in most cases, successfully protects the body, highlighting the impressive capabilities of biological systems in preserving human health.
Choose NO MORE THAN TWO words from the text for each answer.
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| Choose NO MORE THAN ONE word from the text for each answer.
The human body is equipped with an intricate network known as the immune system, functioning as a ______ mechanism against disease-causing organisms. Whenever foreign invaders such as bacteria, viruses, or toxins intrude, this system activates its ______, mainly white blood cells. Certain types, called phagocytes, ______ and eliminate these intruders, whereas lymphocytes keep a record of the pathogens for swift ______ in future invasions. However, the immune system may occasionally fail, either by not recognizing harmful substances, which leads to infections, or by wrongly attacking the body’s cells, causing ______ diseases. Nonetheless, it generally succeeds in safeguarding human health, reflecting the ______ capabilities of biological systems. |
Vocabulary Builder
- Find the synonyms (words with the same or similar meaning) to these 9 words from the original passage.
| Original Word | Variants Used |
|---|---|
| complex | ____________________ |
| network | ____________________ |
| protective | ____________________ |
| pathogens | ____________________ / ____________________ |
| triggers | ____________________ |
| harmful | ____________________ |
| consume | ____________________ |
| pathogens | ____________________ |
| autoimmune | ____________________ |
