Histamines in the human body cause the contractions of muscle tissue in the lungs, uterus and stomach, according to Encyclopaedia Britannica. Histamines also dilate blood vessels, accelerate the heart rate and increase stomach acid production. This protein serves as a neurotransmitter between the nervous system and other cells in the body. Systemically, the most obvious sign of a histamine reaction is inflammation.Know More
Encyclopaedia Britannica indicates histamines activate during an immune response within the body. At an injury site, histamines cause more permeability in cell membranes, which allows fluids, white blood cells and blood plasma proteins to arrive more quickly than normal. Special cells in the body called mast cells release histamines in injured tissue to begin the immune system response.
An allergic reaction occurs in the human body when histamines believe harmless substances such as dust or pollen are invading germs, according to the Biology Department at Davidson College. Histamines increase swelling in bronchial tubes within the lungs during asthmatic reactions when external stimuli enter the organs. Medicines known as antihistamines help control these allergic responses. Allergies that cause histamine reactions are not normal because dust and pollen are not dangerous to the human immune system.
Histamines are released in large amounts during an allergic reaction. Massive amounts of histamines released in the body cause systemic reactions such as sneezing, coughing, runny nose and itchy eyes, explains IMS Health Incorporated.Learn more about Medications & Vitamins
Tissue culture is a biological research process that involves transferring tissue fragments from a plant or animal to an artificial environment wherein the fragments continue to survive and function, according to Encyclopaedia Britannica. The cultured tissue may contain a single cell, a cell population, an entire organ or part of an organ.Full Answer >
The maximum temperature of a Bunsen burner flame is 1500 degrees Celsius, or 2700 degrees Fahrenheit, according to Encyclopaedia Britannica. The warmest part of the Bunsen burner flame is located above the tip of the primary flame.Full Answer >
Edmond Halley was not the first scientist to observe Halley's Comet, but he discovered that recorded comet sightings in 1531, 1607 and 1682 were part of a recurring orbital cycle, according to Encyclopaedia Britannica. He published his findings in 1705 and correctly predicted the comet's next appearance in 1758.Full Answer >
Volcanology is the study of volcanoes, according to Encyclopaedia Britannica. Volcanology deals with the classification, formation and the distribution of volcanoes in various parts of the world.Full Answer >