Specialized cells in plants and animals have unique structures and functions. The document discusses several types of specialized cells including red blood cells, white blood cells, nerve cells, muscle cells, sperm cells, egg cells, root hair cells, palisade cells, and xylem cells. Red blood cells carry oxygen throughout the body while white blood cells protect the body by killing bacteria. Nerve cells carry electrical signals and coordinate functions. Muscle cells allow movement by contracting. Sperm and egg cells are reproductive cells that combine during fertilization. Root hair cells absorb water and minerals in plant roots. Palisade cells contain chloroplasts to perform photosynthesis. Xylem cells transport water and provide structure in plant stems.