What is meant by Malpighian tubules?
What is meant by Malpighian tubules?
Definition of Malpighian tubule : any of a group of long blind vessels opening into the posterior part of the digestive tract in most insects and some other arthropods and functioning primarily as excretory organs. — called also Malpighian tube.
What is Malpighian tubules and its function?
The Malpighian tubules are tubular structures that are free floating in the haemolymph and function as excretory and osmoregulatory organs of insects. As the fluid flows through the tubule, the cells of the MTs take up useful nutrients from the fluid and transport the nutrients through the cell and into the hemolymph.
How do tubules work?
The transverse tubules (t-tubules) are invaginations of the cell membrane rich in several ion channels and other proteins devoted to the critical task of excitation–contraction coupling in cardiac muscle cells (cardiomyocytes).
What is the main function of the excretory system?
The principal function of the urinary system is to maintain the volume and composition of body fluids within normal limits. One aspect of this function is to rid the body of waste products that accumulate as a result of cellular metabolism, and, because of this, it is sometimes referred to as the excretory system.
What is the excretory organ in insect?
Malpighian tubules
In insects, Malpighian tubules (MTs) are the main osmoregulatory and excretory organs and are considered analogous to the nephridia of annelids or the kidneys of vertebrates.
What is the main excretory product of insects?
uric acid
* Most terrestrial insects produce uric acid as their main nitrogenous waste product. Uric acid is a relatively non- toxic and highly insoluble waste product.
What is excretory system in insects?
The primary urine issuing from the malpighian tubules has to pass through the rectum before it leaves the insect’s body, and in the rectum its composition is markedly changed. The insect excretory system therefore comprises the malpighian tubules and the rectum acting together.
What is excretion explain?
excretion, the process by which animals rid themselves of waste products and of the nitrogenous by-products of metabolism. Excretion is a general term referring to the separation and throwing off of waste materials or toxic substances from the cells and tissues of a plant or animal.
What is the excretory organ of vertebrates?
In vertebrates the excretory organs are a pair of kidneys, located dorsally by the sides of the vertebral column and the ureters opening in the cloaca or to the exterior directly through renal apertures.
What is excretion in insect?
Excretion. Some insects can tolerate extremely dry conditions and may excrete uric acid as a dry crystalline powder, along with bone-dry faeces! Insects generally produce only trace amounts of urea. Malpighian tubules. The main excretory organ of the insect is the Malpighian tubule.
How does excretion of wastes in insects take place?
Malpighian tubules of insects and other terrestrial arthropods remove nitrogenous wastes and other solutes from the hemolymph. Na+ and/or K+ ions are actively transported into the lumen of the tubules. Water then enters the tubules via osmosis, forming urine. The urine passes through the intestine, and into the rectum.
What is the excretory system?
The Excretory System is defined as a biological system that helps in the elimination of the nitrogenous waste products of metabolism and also helps in maintaining homeostasis in our body. Different groups of animals have a variety of excretory organs for excretion.
What is the meaning of tubule in anatomy?
tubule – a small tube tube-shaped structure, tube – (anatomy) any hollow cylindrical body structure microtubule – a microscopically small tubule nephron, uriniferous tubule – any of the small tubules that are the excretory units of the vertebrate kidney uveoscleral pathway – a tubule that drains excess aqueous humor
What is the structure of excretory system in invertebrates?
In most invertebrates, these structures are simple tubular forms, whereas vertebrates have a complex structured organ called a kidney. The human excretory system consists of a pair of kidneys, a pair of ureters, a urinary bladder and a urethra.
What is a microtubule in the kidney?
microtubule – a microscopically small tubule. nephron, uriniferous tubule – any of the small tubules that are the excretory units of the vertebrate kidney. uveoscleral pathway – a tubule that drains excess aqueous humor.