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.Continue Reading
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
Grade 2 placental abruption results in mild-to-moderate bleeding and some contractions of the uterus; grade 2 placental abruption can result in some fetal distress. Grade 1 placental abruption results in mild bleeding and some contractions of the uterus; however, there is generally only a small amount of pain and no extensive distress on the fetus. Grade 3 placental abruption results in severe bleeding and painful contractions of the uterus that often do not dissipate; grade 3 placental abruption often results in fetal death, according to Children's Hospital of Wisconsin.Full Answer >
Possible causes of a hiatus hernia include injury to muscle tissue and pressure on muscles that surround the stomach, according to Healthline. In certain individuals, it occurs at birth. There are two types of hernias, sliding and fixed, notes Drugs.com.Full Answer >
The Encyclopaedia Britannica explains that pepsin is most active in the stomach. Pepsin is no longer effective in the intestine, where gastric acids are neutralized. Pepsin's digestive power is most significant at the acidity levels of ordinary gastric juice.Full Answer >
When a dog is ready to have puppies, it will not be interested in eating for 24 hours before, it will lick its vulva and it will have tighter contractions in its stomach that may or may not be noticeable to the owner. Some people will say that checking a dog's temperature can help, but only some dogs will lower their body temperature by a degree or two before giving birth to puppies.Full Answer >