Correlation, regulation, reflexes, self-organization, self-regulation, functional systems
5 topics with brief reviews: definitions, key facts, and class questions.
Managing a complex multicellular organism requires reliable communication and control systems. In this section, we examine how the nervous and endocrine systems integrate cells and organs into a single entity, ensuring continuous self-regulation and adaptation to a changing environment.
The material is structured around the evolution of physiological thought: from basic principles of function regulation and classical reflex theory to the modern understanding of the reflex arc with mandatory feedback. The pinnacle of the section is P.K. Anokhin's theory of functional systems, which explains precisely how the organism forms goal-directed behavior to achieve a useful adaptive result.
During seminars and exams, instructors most frequently ask you to draw the scheme of somatic and autonomic reflex arcs, explain the fundamental difference between an arc and a loop, and break down in detail the central architecture of a functional system (afferent synthesis, decision-making, acceptor of action results). A confident grasp of these concepts is the key to understanding all of special physiology.
These are fusion zones of adjacent membrane regions of neighboring cells. They provide the contact type of chemical correlation, allowing cells to directly exchange protoplasm and biologically active substances.
What happens if one of the components of the reflex arc is damaged?
The reflex will completely disappear. The main condition for the realization of any reflex reaction is the absolute integrity of all five components of the arc.
What is a temporary connection according to I.P. Pavlov?
A temporary connection is a functional connection between the arcs of conditioned and unconditioned reflexes that arises upon their repeated pairing. Constant reinforcement is necessary to maintain it.
What is the fundamental difference between a reflex loop and a classical reflex arc?
Unlike a linear arc, where information flows in only one direction, the loop forms a closed circuit. It includes an additional feedback channel that allows the central nervous system to monitor the quality of the effector organ's action.
What is the acceptor of action results (AAR)?
This is the central forecasting apparatus, a neural model of the expected result. It is formed prior to the actual action and predicts the properties of the intended outcome.
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