The sponge, which lacks the true digestive system, relies on the intracellular digestive process of the choanocytes for energy intake. The limitation of this type of digestion is that the food particles must be smaller than the individual cells.
What does not have a complete digestive system?
In summary, the digestive system is a set of organs or cells that break down food into small nutrients that can be used by animals. The incomplete digestive system has only one opening for food intake and waste removal. These systems are more primitive and are present in lower animal species such as jellyfish and sponges.
Why doesn't the sponge need a body system?
The sponge has no internal organs. They have no muscles, nervous system, or circulatory system. The walls are lined with many small pores called pits that allow water to flow into the sponge. .. Sponge can obtain microorganisms such as algae and bacteria as food from the opening.
How does the sponge feed if there is no digestive system?
The sponge has no nervous system, digestive system, or circulatory system. They rely on maintaining a constant flow of water through their bodies to get food and oxygen and get rid of waste products. Sponges have a unique feeding system among animals.
What does incomplete digestion mean?
The incomplete digestive system consists of a digestive cavity with one opening. A single opening acts as both the mouth and anus. The complete digestive system consists of a gastrointestinal tract with two openings. One opening is the mouth. .. Invertebrates may have one of these two digestive systems. 2021
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