Term Test 1 Flashcards
Anatomy
Science that studies the form and composition of the body’s structures
Physiology
Science that studies the chemistry, biochemistry, and physics of the body’s functions
Levels of anatomy
Gross vs microscopic anatomy
Levels of organisation
Tissue level
Cellular level
Chemical level
Organism level
Organ system level
Organ level
Tissue level
Group of cells and cell products that work together to perform one or more specific functions
Cellular Level
Smallest living units of the body, functions depend on the cell’s organelles
Chemical Level
Smallest stable units of matter that combine to form molecules with complex shapes
Organism Level
Where organ systems work together to maintain the functions of the organism
Organ System Level
Organs that work together (11 in the body)
Organ Level
Two or more tissues working together to perform several functions
Homeostasis
The integrative action of the systems of an organism that result in the maintenance of a stable internal environment despite variations in external conditions
Homeostatic regulation
The adjustment of physiological systems to preserve homeostasis
Homeostatic regulation relies on:
Receptor (or sensor): sensitive to a particular variable or stimulus;
Control centre (or integration centre): receives and processes information supplied by the receptor;
Effector: responds to the commands of the control centre to either oppose (negative feedback) or enhance the stimulus (positive feedback).
Negative feedback
The primary mechanism of homeostatic regulation
Positive feedback loops
Involves stimuli that produce a response that exaggerates or enhances the original change (rather than opposing it). Do not restore homeostasis and produce extreme responses due to the escalating cycle. Typical occurs when dangerous or stressful processes must be completed quickly before the body can restore homeostasis