How does cancer spread in the human body?

Correct option is D

Sol. Cancer spreads (metastasizes) through both the lymphatic system and the bloodstream. Cancer cells can detach from the primary tumor, enter the lymphatic vessels or blood vessels, and travel to distant organs, where they form secondary tumors (metastases). The lymphatic system is a common route for cancers like breast cancer, while the bloodstream is a key pathway for cancers like leukemia and sarcomas.
Explanation of each option:
· (a) Through the skin – Incorrect. Cancer does not spread through the skin; instead, it invades deeper tissues via the lymphatic system and bloodstream. Skin cancers like melanoma can invade the skin layers but do not metastasize externally.
· (b) Through the lymphatic system – Correct, but incomplete. The lymphatic system is a key route for cancer spread, particularly for carcinomas (e.g., breast, lung, and prostate cancer), which often spread to lymph nodes first.
· (c) Through the blood – Correct, but incomplete. Cancer cells can enter the bloodstream and spread to distant organs, leading to metastases in places like the liver, lungs, and bones.
· (d) Both (b) and (c) – Correct answer. Most cancers spread through both the lymphatic system and blood, making this the most comprehensive and accurate answer.