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The endocrine system is part of a major regulatory system coordinating the regulation and integration of body responses trusted vytorin 20 mg. A few examples of endocrine glands include the anterior pituitary vytorin 30mg sale, thymus buy generic vytorin 30 mg on line, adrenal cortex, and gonads. Exocrine Glands Exocrine glands release their contents through a duct that leads to the epithelial surface. Secretions into the lumen of the gastrointestinal tract, technically outside of the body, are of the exocrine category. The unicellular glands are scattered single cells, such as goblet cells, found in the mucous membranes of the small and large intestine. The multicellular exocrine glands known as serous glands develop from simple epithelium to form a secretory surface that secretes directly into an inner cavity. These glands line the internal cavities of the abdomen and chest and release their secretions directly into the cavities. The duct is single in a simple gland but in compound glands is divided into one or more branches (Figure 4. In tubular glands, the ducts can be straight or coiled, whereas tubes that form pockets are alveolar (acinar), such as the exocrine portion of the pancreas. Methods and Types of Secretion Exocrine glands can be classified by their mode of secretion and the nature of the substances released, as well as by the structure of the glands and shape of ducts (Figure 4. The secretions are enclosed in vesicles that move to the apical surface of the cell where the contents are released by exocytosis. For example, watery mucous containing the glycoprotein mucin, a lubricant that offers some pathogen protection is a merocrine secretion. Apocrine sweat glands in the axillary and genital areas release fatty secretions that local bacteria break down; this causes body odor. Both merocrine and apocrine glands continue to produce and secrete their contents with little damage caused to the cell because the nucleus and golgi regions remain intact after secretion. In contrast, the process of holocrine secretion involves the rupture and destruction of the entire gland cell. New gland cells differentiate from cells in the surrounding tissue to replace those lost by secretion. The serous gland produces watery, blood-plasma-like secretions rich in enzymes such as alpha amylase, whereas the mucous gland releases watery to viscous products rich in the glycoprotein mucin. Unlike epithelial tissue, which is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix.
The shield fits over the nipple drawing it out gently generic vytorin 20mg without prescription, making it protrude enough for the baby to feed generic 20 mg vytorin fast delivery. Stimulating the nipple by rolling it between finger and thumb vytorin 20 mg overnight delivery, and exposing the breasts to fresh air (but not direct sunlight) may also help. It is a shallow dish shape, has a tab handle on one edge and a hole in the centre through which the nipple partly protrudes. A nuchal translucency scan is a form of ultrasound scan that measures the amount of fluid in the nuchal cord in the neck of a foetus between weeks 11 and 14 of pregnancy. An abnormal result indicates a higher risk of the foetus having Down syndrome or other spinal cord defects (eg. It is usually combined with a blood test (triple tests) to measure hormone levels that may also be abnormal in women with a Down syndrome pregnancy. These tests are only indicative and an amniocentesis or chorionic villus sampling is necessary to confirm the diagnosis. Unfortunately, if an abnormality is found, there is no treatment available for the foetus, but the mother is given the option of an abortion. They consist of a pair of blades with handles at one end for the doctor to grip, an open cup shape at the other end to encompass the baby’s head and a joint in the middle that enables the forceps to be either manipulated together or separated. They come in many shapes and sizes depending on their purpose, the size of the baby, how far the baby has progressed through the birth canal and the position of the head. Wrigley obstetric forceps are the smallest, and most commonly used as an aid to lift out the head in the very last stage of labour. This fluid acts to protect the foetus from bumps and jarring, recirculates waste, and acts as a fluid for the baby to drink. It may be caused by abnormal development of the foetus, or abnormal function of the placenta, but in most cases, there is no reason for the problem. The condition is diagnosed by an ultrasound scan, and if proved, further investigations to determine the cause of the condition follow. All the eggs (ova) a woman will ever have - and considerably more than she will ever need - are contained in her ovaries when she is born. By puberty these are reduced to about 300,000, and only about 400 will be released during the childbearing years. The number of ova in the ovaries steadily decreases during middle life, and at by the time menopause starts only 25,000 are left. The ovum (egg) is the largest single cell in the body, but still needs a powerful microscope to be seen. When puberty is reached, a cycle is established in which a few of the egg cells develop each month, with one reaching full maturity. A woman is fertile and can become pregnant a day or two either side of ovulation - and not at other times. When an egg is released, it is swept into the adjacent Fallopian tube, the other end of which connects with the uterus.
A channel protein is an example of an integral protein that selectively allows particular materials quality 30 mg vytorin, such as certain ions order 20mg vytorin mastercard, to pass into or out of the cell discount vytorin 30 mg free shipping. Another important group of integral proteins are cell recognition proteins, which serve to mark a cell’s identity so that it can be recognized by other cells. A receptor is a type of recognition protein that can selectively bind a specific molecule outside the cell, and this binding induces a chemical reaction within the cell. One example of a receptor-ligand interaction is the receptors on nerve cells that bind neurotransmitters, such as dopamine. When a dopamine molecule binds to a dopamine receptor protein, a channel within the transmembrane protein opens to allow certain ions to flow into the cell. A glycoprotein is a protein that has carbohydrate molecules attached, which extend into the extracellular matrix. The carbohydrates that extend from membrane proteins and even from some membrane lipids collectively form the glycocalyx. The glycocalyx is a fuzzy-appearing coating around the cell formed from glycoproteins and other carbohydrates attached to the cell membrane. For example, it may have molecules that allow the cell to bind to another cell, it may contain receptors for hormones, or it might have enzymes to break down nutrients. They give each of the individual’s trillions of cells the “identity” of belonging in the person’s body. This identity is the primary way that a person’s immune defense cells “know” not to attack the person’s own body cells, but it also is the reason organs donated by another person might be rejected. Peripheral proteins are typically found on the inner or outer surface of the lipid bilayer but can also be attached to the internal or external surface of an integral protein. Some peripheral proteins on the surface of intestinal cells, for example, act as digestive enzymes to break down nutrients to sizes that can pass through the cells and into the bloodstream. Transport across the Cell Membrane One of the great wonders of the cell membrane is its ability to regulate the concentration of substances inside the cell. A membrane that has selective permeability allows only substances meeting certain criteria to pass through it unaided. In the case of the cell membrane, only relatively small, nonpolar materials can move through the lipid bilayer (remember, the lipid tails of the This OpenStax book is available for free at http://cnx. However, water-soluble materials—like glucose, amino acids, and electrolytes—need some assistance to cross the membrane because they are repelled by the hydrophobic tails of the phospholipid bilayer.
They transport the protein and carbohydrate nutrients absorbed by mucosal cells after food is digested in the lumen quality vytorin 30 mg. The blood vessels’ second function is to supply the organs of the alimentary canal with the nutrients and oxygen needed to drive their cellular processes purchase 30 mg vytorin with amex. Specifically purchase 20mg vytorin fast delivery, the more anterior parts of the alimentary canal are supplied with blood by arteries branching off the aortic arch and thoracic aorta. Below this point, the alimentary canal is supplied with blood by arteries branching from the abdominal aorta. The celiac trunk services the liver, stomach, and duodenum, whereas the superior and inferior mesenteric arteries supply blood to the remaining small and large intestines. The veins that collect nutrient-rich blood from the small intestine (where most absorption occurs) empty into the hepatic portal system. This venous network takes the blood into the liver where the nutrients are either processed or stored for later use. To appreciate just how demanding the digestive process is on the cardiovascular system, consider that while you are “resting and digesting,” about one-fourth of the blood pumped with each heartbeat enters arteries serving the intestines. The Peritoneum The digestive organs within the abdominal cavity are held in place by the peritoneum, a broad serous membranous sac made up of squamous epithelial tissue surrounded by connective tissue. It is composed of two different regions: the parietal peritoneum, which lines the abdominal wall, and the visceral peritoneum, which envelopes the abdominal organs (Figure 23. A few milliliters of watery fluid act as a lubricant to minimize friction between the serosal surfaces of the peritoneum. Chemical peritonitis can develop any time the wall of the alimentary canal is breached, allowing the contents of the lumen entry into the peritoneal cavity. For example, when an ulcer perforates the stomach wall, gastric juices spill into the peritoneal cavity. Hemorrhagic peritonitis occurs after a ruptured tubal pregnancy or traumatic injury to the liver or spleen fills the peritoneal cavity with blood. Even more severe peritonitis is associated with bacterial infections seen with appendicitis, colonic diverticulitis, and pelvic inflammatory disease (infection of uterine tubes, usually by sexually transmitted bacteria). Peritonitis is life threatening and often results in emergency surgery to correct the underlying problem and intensive antibiotic therapy. When your great grandparents and even your parents were young, the mortality from peritonitis was high.