Definitions Flashcards
Homeostasis
Is both the condition of certain variables being held within a constant range and also the regulation of those variables back into their normal range whenever they have deviated.
Negative Feedback
Is initiated by the deviation of a regulated variable then ends with the opposite of whatever stimulus triggered the reaction to return the regulated variable to its safe physiological range.
Anticipatory Feedback
Is when physiological response occurs even before the regulated variable has deviated.
Permissive feedback
Make it easier to correct deviation in the regulated variable. Used to stop physiological responses that would make it harder to correct the deviation in a regulated variable.
Positive Feedback
The stimulus triggers a physiological reaction that furthers the condition or stimulus that started the whole process. Provides acceleration to the process for the desired affect, one goal is reached it stops.
Positive feed forward
Does not provide any feedback. Always done deliberately and continues from one point to the next, with each step having no influence on any previous steps. Ends with negative feedback
Endocrine glands
Are those which secrete hormones into the extracellular fluid where they are then picked up by capillaries and transported throughout the whole body by traveling through the blood.
Exocrine Secretion
Glands that make secretory products that then get secreted directly into a duct. These products then move through the duct and eventually travel through the opening of the duct and out of the body.
Autocrine Response
When a cell releases a hormones that binds to receptors on that very same cell or on nearby cells of the same type and causes a physiological response.
Paracrine Response
When a cell releases a hormones that binds to receptors on nearby cells of a different type and causes a physiological response.
Neurohormones
Are produced within the hypothalamus that are released into the pituitary portal system are termed releasing factors or release inhibiting factors because they ultimately stimulate or inhibit the synthesis and release of hormones from the anterior pituitary