6. Animal cells lack cell walls Therefore a skeleton is necessary to support the tissues of large animals
6. Animal cells lack cell walls Therefore a skeleton is necessary to support the tissues of large animals
Types of body symmetry Body shapes
Types of body symmetry Body shapes
Asymmetry Asymmetrical animais nave no pattern of symmetry. External Projections The simplest represent Flagellated animals(sponges) Chambers are asymmetrical 0.5cm
Asymmetry • Asymmetrical animals have no pattern of symmetry. • The simplest animals (sponges) are asymmetrical
Radial Symmetry The body parts of a radially symmetrical animal are arranged around a central axis so that each part extends from the center Animals that exhibit radial symmetry tend to be sessile(immobile Radial symmetry allows them to reach out in all directions
Radial Symmetry • The body parts of a radially symmetrical animal are arranged around a central axis so that each part extends from the center. • Animals that exhibit radial symmetry tend to be sessile (immobile). Radial symmetry allows them to reach out in all directions
Bilateral Symmetry One cut along the longitudinal axis will produce identical halves of a bilaterally symmetrical animal Bilateral symmetry is best for motile animals Body plan Includes Anterior and posterior ends Dorsal and ventral surfaces Right"and"Left"sides are mirror Images
Bilateral Symmetry • One cut along the longitudinal axis will produce identical halves of a bilaterally symmetrical animal. • Bilateral symmetry is best for motile animals. Body Plan Includes • Anterior and Posterior Ends • Dorsal and Ventral Surfaces • “Right” and “Left” sides are mirror images