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Symptoms
-Swelling, bruising, or redness due to the injury
-Pain at rest
-Pain when the specific muscle or the joint in relation to that muscle is used
-Weakness of the muscle or tendons
Inability to use the muscle at all
Stage 4. Nervous system
The nervous system is involved from the first unicellular organisms, from the development of reactions to stimuli and external environments to the development of complex networks for super-specialized cells (neurons) in the reception, generation, and transmission of stimuli.
In mammals, the nervous system is responsible for a great diversity of complex behaviors that involve more only the very individual put even a society -social behavior.
In the case of human beings, it is responsible for complex and diverse functions such as emotions language creativity or intelligence.
Central nervous system (CNS)
Consists of the brain and spinal cord; where information is evaluated and decisions are made.
-Gray substance
It i's used to refer to the nervous tissue that has darker appearance; this area contains a large number of neuronal bodies and few
myelinated fibers, which gives it its characteristic gray color.