This preview shows page 1. Sign up to view the full content.
Unformatted text preview: Skeletons in Animals Movement is one of the essential features of living things. Cellular movement is observed in one- celled amoebas, ciliates, and flagellates. Flagella whip about to produce cellular motion, while cilia beat synchronously to propel a cell. In animals, movement is essential for locating food and seeking mates. The movement process is centered in the muscle cell, which contracts and relaxes. The contraction yields great force, which is applied against a surface by means of a skeleton. Skeletal systems provide structure or protection to a variety of organisms. A water-based skeleton provides the structure necessary for movement in worms. The hard external skeleton provides a protective mechanism for many organisms but also assists in movement of insects. The internal skeleton present in many animals provides the structural network for support, protection, and...
View Full Document
- Fall '07