How does a mollusk excrete ammonia?

How does a mollusk excrete ammonia?

The vast majority of mollusks are aquatic and excrete nitrogen in the form of ammonia. In octopuses, however, nitrogen is excreted as ammonium chloride, which is quite strongly concentrated in the urine.

How do molluscs excrete?

The excretory system of mollusks is made up of tubular organs called nephridia that filter waste from internal body fluids. Waste generated by cells within the organism is dumped into the coelom, the fluid-filled internal body cavity. The nephridia are small tubes that open into the coelom.

What excretory system do molluscs have?

Mollusks have a coelom and a complete digestive system. Their excretory system consists of tube-shaped organs called nephridia (see Figure above). The organs filter waste from body fluids and release the waste into the coelom.

What are excretion glands?

n. A gland separating waste material from the blood.

Do molluscs have kidney?

In all adult molluscs the kidneys are of coelomic origin. The coelom in the molluscs consists of three regions : the pericardium, the coelomoducts which form the kidney, and the gonocoel. The heart is primitively dorsal to the gut and posterior in position.

Why do most land animals excrete urea instead of ammonia?

Nitrogenous wastes in the body tend to form toxic ammonia, which must be excreted. Mammals such as humans excrete urea, while birds, reptiles, and some terrestrial invertebrates produce uric acid as waste. Conversion of ammonia into uric acid is more energy intensive than the conversion of ammonia into urea.

What is the purpose of mollusk?

Mollusks are important in a variety of ways; they are used as food, for decoration, in jewelry, and in scientific studies. They are even used as roadbed material and in vitamin supplements.

What gland is responsible for excretion?

Kidneys. The paired kidneys are often considered the main organs of excretion. The primary function of the kidneys is the elimination of excess water and wastes from the bloodstream by the production of the liquid waste known as urine .

Do humans have antennal glands?

Antennal or maxillary glands are located in the head, and empty at the base of the second antenna or first maxilla.

Do all chordates have kidneys?

R: Kidneys help in the removal of metabolic wastes along with regulating the osmolarity of body fluids.

What will happen if our kidneys are not present?

If your kidneys stop working completely, your body fills with extra water and waste products. This condition is called uremia. Your hands or feet may swell. You will feel tired and weak because your body needs clean blood to function properly.

Where does the excretion of a mollusk go?

Excretion. The mollusks undigested food becomes a solid waste that is eliminated through the anus as feces.

How does a mollusk get rid of ammonia?

The poisonous ammonia is removed through the body fluids. The mollusks use a simple tubed shaped organ called the nephridia to eliminate the ammonia from the blood stream and to the outside.

What kind of excretion does a clam have?

Clams have the simplest arrangement; the region nearest to the pericardium has glandular walls and gives way to a nonglandular, wider tube that extends to the urinary opening. The vast majority of mollusks are aquatic and excrete nitrogen in the form of ammonia.

Where is the renal gland located in a mollusk?

The anatomical form of the renal gland varies from one class of mollusks to another, but a common plan is clearly evident. The renal gland is a relatively wide tube opening from a sac (the pericardium) surrounding the heart, at one end, and to the mantle cavity (effectively to the exterior) at the other.