Majors animal: Anatomy of Hydra
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each of the black spaces below before clicking
on it to display the answer.
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| Tentacles | Defense and prey capture
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| Mouth | Ingestion of food and elimination of indigestible particles (egestion)
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| Hypostome | Elevated mound of tissue that expands or contracts to regulate size of mouth opening
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| Cnidocytes | Specialized stinging cells located in the epidermal layer of the tentacles and body wall
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| Gastrovascular cavity | Chamber within which extracellular digestion of prey occurs; only opening is through the mouth
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| Bud | Product of asexual reproduction; will fall off when mature and become a self-sufficient organism
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| Gonads | Organs for sexual reproduction; Hydra are dioecious, meaning than an organism has either testes or ovaries, but not both
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| Basal disc | Specialized region for attachment to substrate
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| Epidermis | Outer tissue layer; specialized for protection
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| Gastrodermis | Inner tissue layer; specialized for digestion
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| Mesoglea | Inert, acellular, jellylike substance that aids in supporting the body
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