Does the earthworm have a respiratory organ or system?
Earthworms have no special respiratory organs. Gases are exchanged through the moist skin and capillaries, where the oxygen is picked up by the haemoglobin dissolved in the blood plasma and carbon dioxide is released. Water, as well as salts, can also be moved through the skin by active transport.
What is the respiratory organ of flatworm?
Flatworms have no specialized respiratory system; gases simply diffuse across the body wall.
What are the respiratory organ in cockroach and fish?
BREATHING IN FISH: Fish have a pair of gills. The breathe air, dissolved in water, through gills. BREATHING IN COCKROACH: Cockroach and other insects breathe through spiracles and tracheae. These hollow tubes are called trachea.
What do flatworms do to humans?
flatworms, which include tapeworms and flukes. roundworms, which cause ascariasis, pinworm, and hookworm infections.
How do flatworms obtain oxygen?
Flatworms do not have a respiratory system. Instead, they have pores that allow oxygen to enter through their body. Oxygen enters the pores by diffusion.
What does flatworms look like?
Flatworms have flat, symmetrical, leaf-shaped bodies that grow to a size smaller than a quarter. The oyster flatworm is cream-colored with short tentacles on its sides and has eyespots in two rows along its head.
What organs do flatworms not have?
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.
Do flatworms have a complete digestive system?
Like the cnidarians, flatworms have a digestive system with only a single opening into the digestive cavity, but in independently living marine flatworms the cavity branches into all parts of the body (Fig. 3.37 B). These flatworms feed through a pharynx.
What are some examples of 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 are the harmful effects of flatworms to humans?
Worm infections can lead to diverse and chronic conditions such as scarring of the eyes and blindness, swelling of extremities and immobility, blockage of digestion and malnutrition, anaemia and tiredness. They can also increase an individual’s risk of developing cancer and AIDS.