Because of the thin flat body of flatworms, gases can simply diffuse in and out of the body. ... Which of the following accurately describe bilateral flatworms? They have dorsoventrally flattened bodies.
What are the excretory and Osmoregulatory functions of flatworms?
Flagellated have osmoregulatory and excretory functions in flatworms. ... In a flatworm, which of the following are ciliated cells that primarily function in maintaining osmotic balance between internal and external environments? Flame cells. In a mollusk, the secretes the shell, while the muscular is used for locomotion.
Which of the following accurately describes bilateral flatworms?
Because of the thin flat body of flatworms, gases can simply diffuse in and out of the body. ... Which of the following accurately describe bilateral flatworms? They have dorsoventrally flattened bodies.
Which of these are parasitic flatworms?
The parasitic flatworms include flukes (classes Monogenea and Trematoda) and tapeworms (class Cestoda). There are more than 4,000 species of Monogenea, 9,000 of Trematoda and 5,000 of Cestoda.
What is a flatworm quizlet?
Flatworms are soft, flattened worms that have tissues and internal organ systems . They are the simplest animals to have three embryonic germ layers, bilateral symmetry, and cephlization.
Which of the following best describes cnidarians quizlet?
Which of the following best describes cnidarians? They have radial body symmetry and tissues but lack stinging cells . They have radial body symmetry, lack tissues, but have stinging cells. They are asymmetrical and have tissues and stinging cells.
Which of the following accurately describes gas exchange in mollusks?
Which of the following accurately describes gas exchange in mollusks? Tracheoles are in direct contact with individual cells , allowing oxygen and carbon dioxide th diffuse across the plasma membrane. Ciliated gills propel water through the mantle cavity, where ctenidia extract oxygen and carbon dioxide is carried away.
What is the body type of flatworms?
Flatworms’ bodies are bilaterally symmetrical and they have a defined head and tail region. They have a central nervous system containing a brain and a nerve cord. Clusters of light-sensitive cells on either side of their head make up what are called eyespots.
What are flatworms characteristics?
Characteristics. Flatworms are flattened and have bilateral symmetry . They are triploblastic (have 3 embryonic tissue layers: ectoderm, mesoderm, and endoderm) and therefore have organ-level of organization. There is no body cavity, so they are acoelomate.
Are flatworms Osmoregulators?
Flatworms are unsegmented, bilaterally symmetrical worms that lack a coelom (acoelomate) but that do have three germ layers. Some forms are free living but many are parasitic. ... Excretion and osmoregulation by flatworms is controlled by “flame cells” located in protonephridia (these are absent in some forms).
What are the two examples of flatworms?
- Liver fluke.
- Planaria.
What are the two types of flatworms?
There are three main types of flatworms: flukes, planarians, and tapeworms . Some flatworms are free living organisms, but most are parasitic.
What are 2 parasitic flatworms?
While there are several parasitic flatworms, tapeworms and flukes are the two most commonly studied types. These flatworms are capable of causing diseases in different host organisms, such as fish, dogs, domesticated animals, and humans.
What are two distinguishing characteristics of flatworms?
They are bilaterally symmetrical (i.e., the right and left sides are similar) and lack specialized respiratory, skeletal, and circulatory systems; no body cavity (coelom) is present. The body is not segmented; spongy connective tissue (mesenchyme) constitutes the so-called parenchyma and fills the space between organs.
What is another name for flatworms?
The flatworms, flat worms, Platyhelminthes, or platyhelminths (from the Greek πλατύ, platy, meaning “flat” and ἕλμινς (root: ἑλμινθ-), helminth-, meaning “worm”) are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.
Why are flatworms called acoelomates?
Flatworms are called acoelomate animals. They do not possess a body cavity or coelom Since there is no body cavity in these animals their body is solid without a perivisceral cavity.
