10 Questions
What is the defining characteristic of a complete digestive system?
It has two openings, mouth and anus
What type of circulatory system directly bathes the cells and tissues in blood?
Open type
In which group of animals does the digestive system have only a single opening to the outside of the body?
Platyhelminthes
What is the term for the pattern where organs have associated to form functional systems, each concerned with a specific physiological function?
Organ system level of organisation
What is the defining characteristic of an incomplete digestive system?
It has only a single opening to the outside of the body that serves as both mouth and anus
What type of symmetry is commonly exhibited by sponges?
No symmetry
What is the primary function of the water transport or canal system in sponges?
Food gathering
What is the material that supports the body of sponges?
Spicules or spongin fibres
How do sponges reproduce asexually?
By budding
What is the reproductive characteristic of sponges?
Hermaphroditic (both male and female reproductive organs in the same individual)
Study Notes
Digestive System
- A complete digestive system is characterized by having two openings: a mouth and an anus.
Circulatory System
- Open circulatory systems directly bathe cells and tissues in blood.
Body Structure
- Animals in the phylum Platyhelminthes (flatworms) have a digestive system with only one opening to the outside of the body.
Organ Systems
- The pattern of organs associated to form functional systems, each concerned with a specific physiological function, is called organ system organization.
Digestive System
- An incomplete digestive system is characterized by having only one opening, serving as both mouth and anus.
Body Symmetry
- Sponges commonly exhibit asymmetry or radial symmetry.
Water Transport System
- The primary function of the water transport or canal system in sponges is to bring in food and oxygen and remove waste products.
Body Support
- The material that supports the body of sponges is a skeleton made of spicules or spongin.
Reproduction
- Sponges reproduce asexually by budding, where a new individual grows from the body of the parent.
- Sponges are hermaphroditic, meaning they have both male and female reproductive cells.
Test your knowledge of animal organ systems and their complexities with this quiz. Explore the differences in organ system organization in different animal groups and their physiological functions.
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