![]() A dominant allele is one whose physiological function-such as making hair blonde-occurs even when only a single copy is present (among the two copies of each gene that everyone inherits from their parents). Differing alleles, which can be found at the same spot on a chromosome, produce variation in inherited characteristics such as hair color or blood type. The release of adrenaline causes a number of changes throughout the body, including the metabolism of carbohydrates to supply the body’s energy demands and increased arousal or alertness.Īllele: One of two or more varying forms of a gene due to genetic mutation. They receive signals from the brain and secrete several different hormones in response, including cortisol and adrenaline.Īdrenaline: Also called epinephrine, this hormone is secreted by the adrenal glands in response to stress and other challenges to the body. It is associated with neurons passing electrochemical messages down the axon, releasing neurotransmitters to neighboring cells in the synapse.Īdmissibility: (legal sense) Evidence that is considered to be acceptable or valid for use in legal proceedings.Īddiction: Now commonly called substance use disorder, addiction is a mental health condition where a person’s progressive and chronic use of drugs or alcohol leads to issues with personal relationships, the ability to work, and one’s physical health.Īdrenal glands: Located on top of each kidney, these two glands are involved in the body’s response to stress and help regulate growth, blood glucose levels, and the body’s metabolic rate. Send us feedback.Action potential: Sometimes called a “spike” or described as a neuron “firing,” an action potential occurs when there is a significant increase in the electrical activity along the membrane of a nerve cell. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'brain stem.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Sliman Bensmaia, Scientific American, Scientists discovered in the 1970s that adding lesions to the brain stem of house cats led to the animals becoming far more active in their sleep. Sarah Zhang, The Atlantic, To make matters worse, the cuneate nucleus is nestled in the brain stem, surrounded by vital brain regions that, if damaged, can lead to death. Gil Kaufman, Billboard, 16 June 2022 For example, in the case of a massive brain hemorrhage that destroys most of the brain tissue but leaves the brain stem intact, the baby can breathe at birth but will need other medical care. Kat Cornetta,, 5 July 2022 The reactivation of the zoster virus in the nerves of the face causes paralysis because of the facial nerve that travels from the brain stem behind the ear and into the face to give facial muscles the energy for movement. 2022 The 23-year-old Wayland native was at Brigham and Women’s Hospital, battling a quickly growing lesion on her brain stem. 2022 The bullet missed Rodriguez’s brain stem and carotid artery by 2 centimeters but shattered his jaw, the order said. 2022 In the blue whale, this process reaches astonishing proportions-spinal cord axons can extend 24 meters in length from brain stem to tail. Recent Examples on the Web He was diagnosed with a medulloblastoma - a tumor located on the brain stem - at the age of four and underwent chemotherapy for the next two years until the cancer went into complete remission.Įvan Dudley, al, 7 Oct. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |