Where are gland cells found in Hydra?
Gland cells are found in the endodermal layer with zymogen gland cells (ZMG) in the gastric region and mucous gland cells (MGC) in the head. The head comprises two types of MCGs, granular MGCs (gMGC) and spumous MGCs (sMGC) (Semal-van Gansen, 1954).
Which cells are found in Hydra?
Hydra has three independent cell lines: ectodermal and endodermal epitheliomuscular cells and interstitial stem cells that give rise to nerve cells (including nematocytes), gland cells, and gametes (Steele, 2002, 2006).
What is the function of interstitial cells in Hydra?
The interstitial cells of hydra form a multipotent stem cell system, producing terminally differentiated nerve cells and nematocytes during asexual growth.
Do Hydra have stem cells?
Interstitial stem cells in Hydra constitute a population of multipotent cells, which continuously give rise to differentiated products during the growth and budding of Hydra polyps. They also give rise to germ cells in animals undergoing sexual differentiation.
What are Hydra cells?
A single Hydra is composed of 50,000 to 100,000 cells which consist of three specific stem cell populations that will create many different cell types. These stem cells will continually renew themselves in the body column. Hydras have two significant structures on their body: the “head” and the “foot”.
What is epidermis and gastrodermis?
There are two tissue layers: the epidermis, which lines the outside of the animal, and the gastrodermis, which lines the inside of the animal. These layers are separated by a nonliving layer of elastic, gelatinous material known as the mesoglea, which provides structure and buoyancy without metabolic cost.
What is found in Hydra?
Answer: Hydra are simple invertebrates, with two layers of body cells. Their body is radially symmetric. They have a central cavity through which they take in food and expel waste. Hydras can be found in almost any unpolluted body of water.
How many cells does Hydra have?
What are interstitial cells in Hydra?
Interstitial cells of hydra are small undifferentiated cells containing an abundance of free ribosomes and few other cytoplasmic organelles. They are capable of differentiating into epitheliomuscular, digestive, glandular, nerve cells, and cnidoblasts.
What do interstitial cells do?
Leydig cells, also known as interstitial cells of Leydig, are found adjacent to the seminiferous tubules in the testicle. They produce testosterone in the presence of luteinizing hormone (LH).
What are regenerative cells in Hydra?
Hydra is one of the few organisms that possess tremendous regeneration potential, capable of regenerating complete organism from small tissue fragments or even from dissociated cells. This peculiar property has made this genus one of the most invaluable model organisms for understanding the process of regeneration.
What is the function of gastrodermis in Hydra?
Note:- Gastrodermis is derived from the endoderm. Its main functions are secretion, digestion, and sensory. Therefore, it has the digestive cells, interstitial cells, and gland cells.
Which is part of the Hydra secrete mucus?
The epitheliomuscular cell has a large nucleus, and along the border there is a row of granules which secrete the cuticle. The epidermal cells of the basal disc are granular and they secrete mucus for attachment of Hydra; the basal epidermal cells can also form pseudopodia by which the animal glides on its attachment.
What are the parts of a Hydra called?
Explanation of the parts of a Hydra and their function: Tubular Body- secured by simple adhesive foot called basal disc. basal disc- gland cells secrete sticky fluid which allow adhesive properties: mouth- at the end of the body surrounded by 1-12 thin mobile tentacles.
How are mitochondria present in the cytoplasm of Hydra?
In the cytoplasm is present both rough and smooth surfaced endoplasmic reticulum. Many free ribosomes and numerous typical mitochondria are present in the ground substance of the cytoplasm. One to few Golgi apparatus lie oriented parallel to the long axis of the cell. Golgi apparatus is composed of parallel lamellae, vesicles and vacuoles.
What kind of nervous system does a hydra have?
Respiration and excretion occur by diffusion throughout the surface of the epidermis, while larger excreta are discharged through the mouth. The nervous system of Hydra is a nerve net, which is structurally simple compared to more derived animal nervous systems. Hydra does not have a recognizable brain or true muscles.