This document summarizes various human tissues, including vascular tissue, epithelial tissue, connective tissue, and lymphatic tissue, describing their composition, structure, and functions.
Extract
[...] The nucleus has a nuclear membrane and a nucleoplasm containing chromatin and nucleoli that assemble the subunits of ribosomes and chromatin/DNA (double helix). During cell division, chromatin organizes into chromosomes. Each cell contains 46 chromosomes (22 pairs of autosomes and one pair of gonosomes, XX in females and XY in males) made up of chromatin million histones regulate gene expression. DNA is compacted 400,000 times in a chromosome but is accessible at all times. It contains a sugar (deoxyribose) and a nitrogenous base among adenine thymine cytosine and guanine forming an alphabet. A always binds to T and C to G. [...]
[...] An action on the genome is possible by modifying the environment to activate inhibitory genes . Protein Synthesis requires copying the information from DNA, which cannot leave the nucleus, into RNA. mRNA leaves the nucleus and joins the ribosomes, which assemble proteins based on the mRNA information. The cell lives, communicates, adapts, and dies when its mission is complete, to make way for subsequent generations. The digestive and excretory functions, in particular, are the end result of naturopathic approaches. 2. Tissues Identical cells with the same function come together to form tissues with different roles. [...]
[...] It is immediate and has no memory. Adaptive immunity requires a time of activation to keep in memory for life information about all antigens encountered. An antigen is a foreign substance to the organism or not recognized as belonging to the organism (Self). In mucous membranes, cells carry receptors recognizing molecular motifs DAMPs : danger signals delivered by damaged cells (cancer, pollutants) and PAMPs, motifs associated with pathogens (DNA fragments) that trigger the SI. Cell membranes bind to membrane receptors of pathogens, immobilize them before the arrival of phagocytes, called by signals from sister cells digesting antigens on site. [...]
[...] Through the very thin walls of the capillaries, complex exchanges take place between the cells and the interstitial fluid in which they are bathed. The blood supplies O2 and glucose and eliminates the waste products of which the CO2. By the venous network consisting of the inferior and superior vena cava, the blood returns to the OD. The coronary circulation: the coronary arteries nourish and oxygenate the heart. Myocardial infarction is a complete interruption of the supply of O2 generating cell death. [...]
[...] The PNS contains nerves originating from the SC, transmitting nerve impulses between body regions and the SC and vice versa. It contains two types of pathways from a functional point of view: - the sensory pathway (afferent) : nerve fibers bringing impulses from sensory receptors of the body to the CNS (sensory organs, viscera). It constantly informs the CNS about events inside and outside the body, - the motor pathway (efférente) : nerve fibers bringing motor impulses from the CNS to the effector organs, which trigger an appropriate motor response. [...]
