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In details

Bone remodeling

After the bone reaches its adult size and shape, the old bone tissue is constantly destroyed and new tissue is formed in its place, in a process known as remodeling. Remodeling occurs at different speeds in various parts of the body. For example, the distal portion of the femur is replaced every 4 months; The bones of the hand are completely replaced during the entire life of the individual.
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Simple machines, work and energy

In our daily lives, we live surrounded by machines. It is very common to come across machines of all kinds, from the simplest to the most complex. We use an opener to open cans, cut paper with scissors, hang pictures on nails fixed to the wall by hammers, and hold little children in strollers.
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Articles

Factors that influence photosynthesis

The intensity at which a cell performs photosynthesis can be assessed by the amount of oxygen it releases to the environment, or the amount of CO 2 it consumes. When measuring the photosynthesis rate of a plant, it is clear that this rate may increase or decrease, depending on certain parameters.
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Articles

Chemical mediators in sympathetic and parasympathetic SNPA

In both sympathetic and parasympathetic SNPA ganglia, chemical synapses occur between the pre-ganglion and post-ganglion neurons. In both cases, the neurotransmitter substance of the synapse is acetylcholine. In the terminations of postglandionary neurons, which synapse with the effector organs, however, the neurotransmitter substance is not the same for the two branches of SNPA.
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Nervous system

In our relationship with the world, we are stimulated all the time and respond to the elements of the environment. With each external stimulus (such as the smell of food or the sound of a horn) and even internal stimulus (such as pain or hunger), the organism reacts, that is, in a way “answers these questions: Where does the stimulus?
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Hormonal control in human reproduction

Gonadotropins FSH (follicle stimulating hormone) and LH (luteinizing hormone) are produced by the anterior portion of the pituitary and regulate the activity of the ovaries and testes. These organs, in turn, will produce hormones that will act on the emergence of secondary sexual characters and the process of human reproduction.
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