Diversity of Form and Function Lab Practical Invertebrates and Vertebrates

Sea anemone pedal disc

a foot-like organ at the base that anchors it to hard surfaces

Sea anemone oral disc

the flat, circular top part that holds its mouth and its ringed by stinging tentacles

Sea anemone tentacles

captures prey, defends against predators, and moves food to the mouth

Sea anemone gastrovascular cavity

a central sac-like internal space that acts as a combined stomach, circulatory system, and hydrostatic skeleton

Sea anemone septa

vertical, curtain-like tissue walls that divide the animal’s central gastrovascular system cavity into smaller chambers

• increases surface area for digestion, gas exchange, and nutrient absorption, while also providing structural support

Earthworm clitellum

a thick, smooth, band-like swelling on the body wall of a sexually mature earthworm that is essential for reproduction

Earthworm esophagus

a tube that moves food from the pharynx to the crop, while using calciferous glands to release calcium carbonate and neutralize acids that in the ingested soil

Earthworm crop

an internal digestive organ that temporarily stores food

Earthworm gizzard

a thick muscular organ in an earthworm’s digestive system that mechanically grinds up soil, sand, and organic matter

Earthworm intestine

a long, straight tube that runs through most of the body from segment 15 to the very end, handling chemical digestion and nutrient absorption

Earthworm hearts (5 pairs)

aortic arches that function like __ to pump blood into their bodies

Earthworm vesicles

large, cream-colored paired organs that mature and store the worm’s own sperm cells