Cnidocyte: Difference between revisions
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== Cnidocyte == | |||
[[File:Nematocyst1.jpg|thumb|right|A nematocyst, a type of cnidocyte, ready to discharge.]] | |||
A '''cnidocyte''' is a specialized cell | A '''cnidocyte''' is a specialized cell found in members of the phylum [[Cnidaria]], which includes organisms such as [[jellyfish]], [[sea anemones]], and [[corals]]. These cells are primarily used for capturing prey and defense against predators. Cnidocytes contain organelles called [[nematocysts]], which are capable of delivering a sting to other organisms. | ||
==Structure== | == Structure == | ||
[[File:Model_Overview.png|thumb|left|Model overview of cnidocyte structure and function.]] | |||
Cnidocytes | Cnidocytes are complex cells that contain a capsule-like organelle called a nematocyst. The nematocyst is a coiled, thread-like structure that can rapidly evert to deliver toxins. The cnidocyte is equipped with a trigger mechanism, known as a cnidocil, which, when stimulated, causes the nematocyst to discharge. | ||
== Function == | |||
[[File:Nematocyst-discharged.png|thumb|right|A discharged nematocyst showing the everted thread.]] | |||
The primary function of cnidocytes is to capture prey and provide defense. When the cnidocil is triggered, the nematocyst discharges, and the thread penetrates the target, injecting toxins that can immobilize or kill the prey. This mechanism is highly efficient and allows cnidarians to capture prey much larger than themselves. | |||
== Development == | |||
[[File:Cnidocyte_development_in_hydra.png|thumb|left|Development of cnidocytes in Hydra.]] | |||
Cnidocytes | Cnidocytes develop from interstitial cells in the epidermis of cnidarians. The development process involves the differentiation of these cells into mature cnidocytes, complete with a fully formed nematocyst. This process is crucial for the maintenance of the cnidarian's ability to capture prey and defend itself. | ||
== | == Types of Cnidocytes == | ||
There are several types of cnidocytes, each with a specific function: | |||
* '''Nematocytes''': These are the most common type and are responsible for delivering the sting. | |||
* '''Spirocysts''': Found in some cnidarians, these cells release a sticky thread used for adhesion rather than stinging. | |||
* '''Ptychocysts''': These are used by some sea anemones to construct their tubes. | |||
==Related | == Ecological Role == | ||
Cnidocytes play a crucial role in the ecology of cnidarians. By enabling these organisms to capture prey, cnidocytes help maintain the balance of marine ecosystems. They also provide a defense mechanism that deters predators, allowing cnidarians to thrive in various environments. | |||
== Related Pages == | |||
* [[Cnidaria]] | * [[Cnidaria]] | ||
* [[Nematocyst]] | * [[Nematocyst]] | ||
| Line 37: | Line 35: | ||
* [[Sea anemone]] | * [[Sea anemone]] | ||
* [[Coral]] | * [[Coral]] | ||
[[File:Chironex_fleckeri_nematocysts_01.jpg|thumb|right|Nematocysts from the box jellyfish ''Chironex fleckeri''.]] | |||
[[Category:Cnidarians]] | [[Category:Cnidarians]] | ||
[[Category: | [[Category:Animal anatomy]] | ||
[[Category: | [[Category:Stinging cells]] | ||
Revision as of 14:18, 21 February 2025
Cnidocyte
A cnidocyte is a specialized cell found in members of the phylum Cnidaria, which includes organisms such as jellyfish, sea anemones, and corals. These cells are primarily used for capturing prey and defense against predators. Cnidocytes contain organelles called nematocysts, which are capable of delivering a sting to other organisms.
Structure
Cnidocytes are complex cells that contain a capsule-like organelle called a nematocyst. The nematocyst is a coiled, thread-like structure that can rapidly evert to deliver toxins. The cnidocyte is equipped with a trigger mechanism, known as a cnidocil, which, when stimulated, causes the nematocyst to discharge.
Function
The primary function of cnidocytes is to capture prey and provide defense. When the cnidocil is triggered, the nematocyst discharges, and the thread penetrates the target, injecting toxins that can immobilize or kill the prey. This mechanism is highly efficient and allows cnidarians to capture prey much larger than themselves.
Development
Cnidocytes develop from interstitial cells in the epidermis of cnidarians. The development process involves the differentiation of these cells into mature cnidocytes, complete with a fully formed nematocyst. This process is crucial for the maintenance of the cnidarian's ability to capture prey and defend itself.
Types of Cnidocytes
There are several types of cnidocytes, each with a specific function:
- Nematocytes: These are the most common type and are responsible for delivering the sting.
- Spirocysts: Found in some cnidarians, these cells release a sticky thread used for adhesion rather than stinging.
- Ptychocysts: These are used by some sea anemones to construct their tubes.
Ecological Role
Cnidocytes play a crucial role in the ecology of cnidarians. By enabling these organisms to capture prey, cnidocytes help maintain the balance of marine ecosystems. They also provide a defense mechanism that deters predators, allowing cnidarians to thrive in various environments.
Related Pages
