Homeostasis and Directional Flashcards
Anatomy
the science of the structure of living organisms
Physiology
the science of functioning of living organisms
Organelle
specialized structures in a cell that perform specific metabolic functions
Cell
the basic biological unit of living organisms, containing a nucleus and variety of organelles enclosed by a limiting membrane
Tissue
a group of similar cells specialized to perform a specific function primary tissue types are epithelial, connective, muscle, and nervous tissues
Organ
a part of the body formed of two or more tissues that performs a specialized function
Organ system
a group of organs that work together to perform a vital body function
Organism
an individual living thing
Metabolism
the sum total of the chemical reactions that occur in the body
Homeostasis
a state of body equilibrium or stable internal environment of the body
Negative-feedback mechanisms
feedback that causes the stimulus to decline or end
Receptor
a peripheral nerve endings specialized for response to particular types of stimuli
Control center
helps maintain homeostasis
Positive-feedback mechanism
feedback that tends to cause a variable to change in the same direction as the initial change enhances the stimulus
Effector
an organ, gland, or muscle capable of being activated by nerve endings
