Correct Option
The correct option is Spermatozoa
Explanation
Cellular movement in humans is primarily classified into three types: amoeboid, ciliary, and flagellar. Flagellar movement relies on the presence of a flagellum, a long, whip-like organelle that generates propulsion through undulatory motion.
Option Analysis
- Spermatozoa Sper Spermatozoa are the only cells in the human body that possess a flagellum. The flagellar tail enables the sperm to swim through the fluid medium of the female reproductive tract to reach the ovum for fertilization.
- Osteocytes Osteocytes: Incorrect. Osteocytes are mature bone cells enclosed within lacunae in the bone matrix. They are stationary cells and do not exhibit locomotion.
- Platelets Platelets: Incorrect. Platelets are cell fragments involved in hemostasis. While they can change shape and extend pseudopodia (amoeboid-like changes) during activation, they do not possess flagella or exhibit flagellar movement.
- Chondrocytes Chondrocytes: Incorrect. Chondrocytes are the cells found in cartilage. They are embedded within the cartilaginous matrix and do not possess locomotor organelles like flagella.
Key Takeaway
Flagellar movement in humans is exclusively exhibited by spermatozoa. In contrast, ciliary movement is found in the respiratory tract and fallopian tubes, while amoeboid movement is characteristic of leukocytes (e.g., macrophages).