They are elongated and column shaped. The nuclei are elongated and and usually found towards the base of the cells. They form the lining of the stomach and intestines. They secrete mucus to keep the surface smooth. Ciliated Columnar Epithelium are simple columnar epithelial cells but they have fine, hair like cilia on their free surfaces.
Diatoms are type of algae , found in toothpaste, they can be classified into two groups called centric and pennate. Finally there are protozoa which are single celled and can cause diseases such as malaria and sleep sickness. (www.enviroliteracy.org/article.php/317.html ) As do we, microorganisms under go normal life functions. Although they are so tiny they still could reproduce, and carry out processes, such as excretion, respiration and regulation. They have their own way of moving called locomotion and different types of structures.
Depending on the contents these are despatched to one of three destinations: Cytoplasm-The cytoplasm consists of all of the contents outside of the nucleus and enclosed within the cell membrane of a cell. This includes the cytosol and in euckaryotic cells, organelles such as mitochondria and ribosomes. Also located within the cytoplasm is the cytoskeleton, a network of fibers that help the cell maintain its shape and give it support. The cytoplasm is clear in colour and has a gel-like appearance. It is composed mainly of water and also contains enzymes, salts, organelles, and various organic molecules.
Comparison chart | Meiosis | Mitosis | Definition: | A type of cellular reproduction in which the number of chromosomes are reduced by half through the separation of homologous chromosomes in a diploid cell. | A process of asexual reproductionin which the cell divides in two producing a replica, with an equal number of chromosomes in haploid cell | Function: | sexual reproduction | Cellular Reproduction & general growth and repair of the body | Type ofReproduction: | Sexual | Asexual | Occurs in: | Humans, animals, plants, fungi | all organisms | Genetically: | different | identical | Crossing Over: | Yes, mixing of chromosomes can occur. | No, crossing over cannot occur.
Sweat glands are comprised of two types; eccrine and apocrine. They consist of coiled tubes embedded in the dermis or hypodermis and open out onto the skin surface. Sebaceous glands are flask shaped glands that secrete sebum through an opening directly into the hair follicle or skin. The hair and its follicle are found
SER lacks ribosomes and participates in lipid synthesis and detoxification. The Golgi apparatus is a system of membranous cisternae and vesicles arranged in stacks near the nucleus. The Golgi processes and modifies sugar side chains on proteins that are being secreted or destined for the plasma membrane or other membrane-bound organelles like the lysosome. Therefore, the Golgi apparatus is particularly prominent in cells synthesizing large
Animals, on the other hand, have a spindle of microtubules that have a centriole at the end of the spindle. Another difference is that when plants go through cytokinesis, cell plates form in the middle of the mother cell and turns into a rigid cell wall that separates the two daughter cells. Instead of this, animal cells during cytokinesis make a cleavage furor that will pinch the plasma membrane, effectively dividing the two daughter cells. Modeling the Stages of Mitosis Note: This part is optional. If you do not have the
These vessels are generously spread throughout the entire body, present in nearly every tissue of the body. These vessels, similar to the circulatory vessels, are composed of smaller lymphatic capillaries that converge to form collecting vessels. These vessels then merge even further to form what is known as a lymphatic trunks, which give rise to the lymphatic ducts. There are two major lymphatic ducts in the body; the right lymphatic duct, which drains the right arm and right side of the trunk, head and neck, and the thoracic duct, which drains the remaining portions of the
The third type of squamous tissue is transitional, this is grouped with the stratified. This is found in the bladder or uterus & is designed to withstand the action of urine. Columnar or glandular – These are single layered cylindrical shaped cells. These cells secrete mucous which assist with lubricating the oesophagus to help with passing of food. These cells are found lining food passages.
Causes The first and primary cause of endometriosis is retrograde menstruation, which occurs when the menstrual period flows back into the Fallopian tubes and pelvic cavity instead of flowing down the cervix and out of the vagina. The menstrual flow is known to contain the endometrial cells that form the endometrial tissue which is produced during menstruation. When these endometrial cells attach themselves to the pelvic cavity, they grow into endometriosis. Endometriosis can also develop to a woman after surgery whereby the endometrial tissue from the uterine cavity can attach themselves on the surgical incision causing endometriosis to develop. The surgical procedure which can lead to endometriosis is any procedure in which the surgeon comes in contact with endometrial cells.