Planaria are flatworms
What is the excretory structure in flatworms?
Flatworms have an excretory system with
a network of tubules throughout the
body that open to the environment and nearby flame cells, whose cilia beat to direct waste fluids concentrated in the tubules out of the body. The system is responsible for regulation of dissolved salts and excretion of nitrogenous wastes.
Which type of excretory organs are used by Planaria?
Planarians can regenerate any missing body part, requiring mechanisms for the production of organ systems in the adult, including their prominent tubule-based filtration excretory system called
protonephridia
.
What is the structure of excretory?
The human excretory system comprises of the following structures:
two bean-shaped kidneys, two ureters, one urinary bladder, and one urethra
. Kidneys are the main organ of the human excretory system. The kidneys are paired organs and are located one on each side of the spine at the level of the liver.
What is the simplest type of excretory system found in planaria?
A flame cell
is a specialized excretory cell found in the simplest freshwater invertebrates, including flatworms, rotifers and nemerteans; these are the simplest animals to have a dedicated excretory system. Flame cells function like a kidney, removing waste materials. Bundles of flame cells are called protonephridia.
What are three organs in humans that get rid of cellular waste?
Organs of excretion include
the skin, liver, large intestine, lungs, and kidneys
. All of them excrete wastes, and together they make up the excretory system . The skin plays a role in excretion through the production of sweat by sweat glands.
What is the function of Protonephridia?
Protonephridia likely first arose as a way to cope with a hypotonic
environment by removing excess water from the organism (osmoregulation)
. Their use as excretory and ionoregulatory structures likely arose secondarily. These are excretory systems in phyla Platyhelminthes and are also called blind tubules.
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.
Can a flatworm detect touch?
Many flatworms have auricles. Auricles consist of angled projections from the sides of the head, which gives some flatworms’ heads an arrow-shaped appearance. Auricles contain concentrations of nerve cells. These nerves are
sensitive to both touch
, moisture and certain chemicals.
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 the types of excretion?
- Ammonotelism (Type of excretion- ammonia)
- Ureotelism (Type of excretion – urea)
- Uricotelism (Type of excretion – uric acid)
- Aminotelism (Type of excretion – amino acids)
- Guanotelism (Type of excretion – guanine)
What are examples of excretion?
The matter, such as
urine or sweat
, that is so excreted. Excretion is defined as the process of expelling waste matter, or the waste matter expelled by this process. When a person goes to the bathroom to urinate, this is an example of excretion. Urine is an example of excretion.
What is structure of nephron?
The nephron is the minute or microscopic structural and functional unit of the kidney. It is composed of
a renal corpuscle and a renal tubule
. The renal corpuscle consists of a tuft of capillaries called a glomerulus and a cup-shaped structure called Bowman’s capsule. The renal tubule extends from the capsule.
Do cockroaches Nephridia?
Excretory organs
of Cockroach and other insects are (1) Nephridia (2) Flame cells (3) Malpighian tubules (4) Gizzard. Malpighian tubules constitute the excretory organs of cockroach and other insects. Nephridia are the most generally found excretory organs in earthworms.
Who named platyhelminthes?
PLATYHELMINTHES. Platyhelminthes (pla-te-hel-MIN-thes) is made of two Greek roots that mean “flat worms” [flat -plato (πλάτω); and worm -helmis (ελμισ)]. The reference is to the flattened nature of the animals in this phylum. The name was coined by
Gegenbaur (1859)
.
What type of excretory system is present in platyhelminthes?
Rennate glands
– It is a secretory-excretory organ present in the nematodes. Note: Platyhelminthes are the simplest animals having a dedicated excretory system. The flame cells function as a kidney for removing waste materials. The bundles of flame cells are called protonephridia.
