Flashcards in Part 3 Topic B Deck (15)
what plays a key role in the ability to maintain homeostasis in the face of changing environmental conditions?
the autonomic nervous system
maintaining homeostasis requires:
work, the organism has to "actively" maintain a steady state
describes the effect in which the final product of a biochemical pathway inhibits the first step; the process in which a stimulus acts on a sensor that communicates with an effector, producing a response that opposes the initial stimulus. Negative feedback is used to maintain steady conditions, or homeostasis
homeostatic regulation relies on:
what is thermoregulation?
the ability to maintain a constant body temperature
the active regulation and maintenance, in animals, organs, or cells, of a stable internal physiological state in the face of a changing external environment
how does the endocrine system maintain homeostasis?
depends on feedback from the target organ to the endocrine gland that secretes the hormone which increases/decreases its subsequent production of hormone
hormones are transmitted through the:
bloodstream - feedback can occur over varying distances
in the nervous system, the type of feedback in which a stimulus causes a response that leads to an ENHANCEMENT of the original stimulus that leads to a larger response. In the endocrine system, the type of feedback in which a stimulus cases a response, and that responses causes a further response in the same direction. In both cases, the process reinforces itself until interrupted
what are four things always involved in a system of feedback?
constant feedback between the response and sensor maintains a set point, meaning...
homeostasis is an active process
the sensor and effector may be...
a single cell, an endocrine organ, or a series or endocrine organs
a disease that results when the control of blood-glucose levels by insulin fails
positive feedback provides enhancement that allows for:
accelerated responses of target cells for a period of time