Answer:
Leptin is a protein hormone composed of 167 amino acids of the cytosine family, it is synthesized mainly by white adipose tissue. The leptin receptor is related to that of receptors for cytosines (since it uses Janus or JAK type kinases and STAT-3 proteins as intracellular mediators of transcription pathway), it is predominantly found in the hypothalamus (particularly in the arcuate nucleus and to a lesser extent in the nuclei dorsomedial and ventromedial), hippocampus and cerebellum. There is evidence that leptin acts at the level of the arcuate nucleus, preventing the formation of NPY.
Explanation:
Leptin is produced exclusively in adipose tissue cells in a wide variety of species, including humans, and its concentration is higher in overweight than in lean individuals. The biological actions of leptin can be classified into two groups, those that are exerted in the tissues of the central nervous system, mainly the hypothalamus, and those that are carried out on the peripheral tissues. The former regulate body weight downward, decrease food intake, increase basal energy expenditure and modify some neuroendocrine functions such as reproduction, while the latter have effects on proliferation, differentiation and metabolism of peripheral tissues. The leptin that reaches the hypothalamus, in addition, inhibits protein synthesis and the secretion of neurons producing NPY / AgRP of the arcuate nucleus and stimulates the synthesis and secretion of those containing POMC. NPY (neuropeptide Y) is produced in the hypothalamic arcuate nucleus. This neurotransmitter arrives through the projections of the neurons of said nucleus to the paraventricular nucleus, which is the area where it is released. There are several studies that have shown that an increase in NPY leads to an increase in the sensation of hunger and thus to hyperphagia and obesity. Leptin acts at the level of the arcuate nucleus, preventing the formation of NPY. The leptin receptor lacks enzymatic activity in its intracellular domain. Instead, it is linked to members of the janus kinase family, which belong to a class of tyrosine kinases. The binding of the ligand activates the Jak kinase and leads to the phosphorylation of certain cytoplasmic proteins. Within these proteins there is a class of cytoplasmic transcription factors called signal transducers and activators of transcription (STAT).
Answer:
The Law of Conservation of Mass tells us that matter is neither created nor destroyed during a chemical reaction. Atoms can be rearranged to form new compounds, but the total mass of the system remains constant.
I think the correct answer from the choices listed above is the first option. The male <span>reproductive system is different from other body systems in a way that </span>it isn’t necessary to vital signs. The vital signs are <span>Body </span>temperature, Pulse<span> rate, </span>Respiration rate<span> (rate of </span>breathing<span>) and </span>Blood pressure which does not include the male <span>reproductive system.</span>
Answer:
The correct answer is one strand of each new molecule comes from the original molecule.
Explanation:
DNA replication is process by which the parental DNA is converted into two daughter DNA molecule.DNA replication is semi conservative in nature which means each newly synthesized daughter DNA molecule contain 50% parental DNA characteristics.
Each newly synthesizd daughter DNA molecule contain one parental strand and one newly synthesized strand..Thus half of the characteristics of parental DNA is being conserved in each newly formed daughter DNA molecule.
Answer:
A - longleaf woodocoats, water oaks
Explanation:
Rhis is because primary consumers eat plants and not other animals.
