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The hypothalamic–pituitary–thyroid axis ( HPT axis for short, a.k.a. thyroid homeostasis or thyrotropic feedback control) is part of the neuroendocrine system responsible for the regulation of metabolism and also responds to stress. As its name suggests, it depends upon the hypothalamus, the pituitary gland, and the thyroid gland .
The compound migrated close to thyroxine in chromatography and they initially named it 'unknown 1' . Around that time a group led by Jean Roche in Paris described a deiodinating activity in the sheep thyroid gland, raising the possibility that 'unknown 1' is the less iodinated analogue of T4, triiodothyronine. [24]
The major form of thyroid hormone in the blood is thyroxine (T 4), whose half-life of around one week [4] is longer than that of T 3. [5] In humans, the ratio of T 4 to T 3 released into the blood is approximately 14:1. [6] T 4 is converted to the active T 3 (three to four times more potent than T 4) within cells by deiodinases (5′-deiodinase).
The blood type personality theory [1] is a pseudoscientific belief prevalent in Japan which states that a person's blood group system is predictive of a person's personality, temperament, and compatibility with others. [2] The theory is generally considered a superstition by the scientific community.
The hypothalamic–pituitary–adrenal axis ( HPA axis or HTPA axis) is a complex set of direct influences and feedback interactions among three components: the hypothalamus (a part of the brain located below the thalamus ), the pituitary gland (a pea-shaped structure located below the hypothalamus), and the adrenal (also called "suprarenal ...
Psychophysiology. Psychophysiology (from Greek ψῡχή, psȳkhē, "breath, life, soul"; φύσις, physis, "nature, origin"; and -λογία, -logia) is the branch of psychology that is concerned with the physiological bases of psychological processes. [ 1] While psychophysiology was a general broad field of research in the 1960s and 1970s ...
Physiological psychology is a subdivision of behavioral neuroscience (biological psychology) that studies the neural mechanisms of perception and behavior through direct manipulation of the brains of nonhuman animal subjects in controlled experiments. [ 1][page needed] This field of psychology takes an empirical and practical approach when ...
t. e. In biology, homeostasis ( British also homoeostasis; / hɒmioʊˈsteɪsɪs, - miə -/) is the state of steady internal physical and chemical conditions maintained by living systems. [ 1] This is the condition of optimal functioning for the organism and includes many variables, such as body temperature and fluid balance, being kept within ...