8 topics with a brief review: definitions, key facts, and classroom questions.
This chapter is dedicated to the fundamental mechanisms of the body's adaptation to changing environmental conditions. We will analyze how protective and compensatory processes work, and why an evolutionarily useful reaction sometimes fails, leading to severe systemic breakdowns.
The section consistently covers the concept of the general adaptation syndrome, causes, and classical stages of stress. You will study the molecular and neuroendocrine pathogenesis of the stress response, the damaging pathogenic effects of distress, as well as the body's natural stress-limiting systems and the basic principles of pharmacological protection.
In seminars and exams, Selye's triad, the links of pathogenesis, the differences between adaptation and compensation, and the mechanisms of maladaptation diseases are tested most rigorously. A firm understanding of this chapter is your key to successful clinical practice, as uncontrolled stress underlies most modern psychosomatic and somatic pathologies.
This is a phenomenon whereby successful adaptation of the body to one extreme factor simultaneously increases its resistance to completely different stimuli.
Does the adaptation syndrome always end in exhaustion?
No, the exhaustion stage is not obligatory. It develops only with repeated exposure to stress or in weakened patients due to the depletion of energy supply systems.
What are diseases of maladaptation?
These are specific forms of pathology that develop as a result of the depletion of the body's defenses following experienced stress.
How do specific and non-specific reactions differ during stress?
Specific reactions ensure adaptation to a particular factor (e.g., cold or hypoxia). Non-specific reactions are standard and develop upon any unusual exposure—they form the basis of the stress response.
Which body systems play a key role in the development of the stress response?
For the rapid mobilization of adaptive mechanisms, the sympathoadrenal system, thyroid gland, and pancreas are activated. However, the key role in this process belongs to the hypothalamic-pituitary-adrenal axis (HPA axis).
Why do gastric ulcers occur during severe stress?
Due to the phenomenon of blood flow redistribution. Blood is directed to the heart and brain, while hypoperfusion and ischemia occur in the gastrointestinal tract, leading to the formation of erosions and "stress ulcers".
Master the entire topic in the "Pathophysiology" course
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