I've recently read a book on evolutionary-developmental biology for laymen, and it described how a fetus is progressively divided into more refined zones of genetic activity. These zones, kinda lik…
Nucleic acids are macromolecules of a chemical nature, formed by nucleotides, phosphorus group (phosphate), glycide (monosaccharide / pentoses) and a nitrogenous base, composing the genetic material contained in the cells of all living beings. Present in the nucleus of eukaryotes and dispersed in the prokaryote hyaloplasm, nucleic acids can be of two types: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), both related to the mechanism of cellular metabolic control (cell functioning) and hereditary transmission of characteristics.
In mitosis of superior plant cells, basically two differences can be highlighted compared to what occurs in animal cell mitosis: Mitosis occurs without centrioles. From certain locations, corresponding to the centrosomes, the spindle fibers radiate. Since there are no centrioles, then there is no aster.
Mediated Endocytosis If membrane invagination is triggered by the binding of a particular substance to a specific membrane constituent, it is a mediated endocytosis process and is called that receptor constituent. To enter the cell in this way it is necessary that the membrane has receptors specific to the substance in question.
At this stage, the chromosomes reach their maximum spiral, shorten and are located in the equatorial region of the cell. At the very end of the metaphase and the beginning of anaphase, duplication of the centromeres occurs. Next content: Chemistry of Life
Another food category indispensable to humans is protein, the main component of cell mass. They have the most active part in the body's constitution, having a fundamental role in the formation in the growth, regeneration and replacement of different tissues, especially the muscles.
You already know that blood carries nutrients, respiratory gases, hormones and metabolism residues. Although the blood appears to be a completely homogeneous red liquid, under the optical microscope we can see that it consists basically of: plasma, red blood cells, white blood cells and platelets.
Platelets are cellular fragments that are much smaller than blood cells, that is, smaller than red blood cells and leukocytes. Platelets act on blood clotting. When there is a ruptured blood vessel injury, a series of events occur that prevent blood loss. Coagulation or clot formation, which is part of this process, occurs when filaments of a transformed plasma protein form a kind of network and impede the passage of blood.
What are anabolic steroids? Bombs are hormones. Produced from animal extracts, they are synthetic hormones similar to testosterone, the main male hormone, which have anabolic and androgenic properties. What do they do in the body? When they fall into the bloodstream and penetrate the cell, anabolic steroids begin to function, attaching themselves to an androgen receptor, migrate to the nucleus and stimulate protein synthesis.
Swallowing After chewing and salivation, what we call a swallow cake is formed. After swallowing, the food bolus passes through the pharynx and reaches the esophagus. Pharynx The pharynx is an elongated funnel-shaped cavity organ located just beyond the mouth. It communicates with the mouth, nasal cavities, larynx, and esophagus.
Tissues also cluster in our body. A grouping of interacting tissues forms an organ. The stomach, for example, is an organ of the human body. In it we can recognize the presence of epithelial and muscle tissue, among others. Scheme showing the various organs of our body Systems Various organs interact in the human body, performing a certain function in the body.
The embryo, similar to a "ball" of cells, reaches the uterus. There it is implanted, that is, it attaches to the uterine mucosa approximately eight days after fertilization. This fixation in the uterine mucosa is called nesting. The small embryo, formed from the zygote, may develop in the womb, protected by membranes and amniotic fluid.
Pharynx: It is a common channel to the digestive and respiratory systems and communicates with the mouth and nasal passages. The air inspired by the nostrils or mouth necessarily passes through the pharynx before reaching the larynx. Larynx: It is a tube supported by articulated cartilage pieces, located in the upper neck, in continuation of the pharynx.
Rhinitis Rhinitis is a medical term that describes irritation and chronic or acute inflammation of the nasal mucosa. It is a disease that can be caused by both viruses and bacteria, although it is most commonly manifested as a result of allergy, or by reactions to dust, smoke and other environmental agents.
Conjunctivitis is the inflammation of the conjunctiva, a thin transparent membrane that lines the front of the eyeball (the whites of the eyes) and the inside of the eyelids. It usually attacks both eyes, can last from one week to 15 days and usually does not leave sequelae. The combination of various symptoms may be present in conjunctivitis such as itching, reddening and watering eyes, blurred and light-sensitive vision, swelling of the eyelids, and may also occur headache, general malaise and inflammation in the ganglia.
Skeleton Division The human skeleton can be divided into three main parts: Head The skull is a bone structure that protects the brain and forms the face. It is made up of 22 separate bones, allowing it to grow and maintain its shape. These bones lie along lines called sutures, which can be seen in the skull of a baby or a young person, but gradually disappear around age 30.
Vagina It is the channel that connects the vulva to the uterus. Uterus It is a hollow organ, made up of highly elastic muscle tissue that has a shape and size similar to a pear. In case of pregnancy, the uterus is prepared to house the embryo until birth. Ovaries The ovaries are the female sex glands in which, since the birth of the girl - approximately 400,000 female gametes are stored.
Living things differ from raw matter in that they are made up of cells. Viruses are beings that do not have cells, but are capable of reproducing and undergoing changes in their genetic material. This is one of the reasons why they are still debating whether or not they are living beings. The cell is the smallest part of living beings with definite form and function.
If you are already afraid of spiders, better not even come close to this article. You don't need six more reasons to hate these pets, which are even more like Spider-Man than you thought. Here are some bizarre superpowers that spiders actually possess: Have you tried to gather several pillows under the blanket to fool someone?
The discovery not only changes the way scientists view bacteria; It also changes the way they see our brain. A new study points out that bacteria have a much more sophisticated communication system than expected. The research was performed on biofilms or bacterial "plaques" that make up the tartar - yes, the one that lodges in the teeth.