Human Body (ORGANIZATION & HOMEOSTASIS) Flashcards
smallest stable units of matter
Atoms
structural and functional components of cells; little organs
Organelles
smallest living units in the body; have the largest fluid in the body
Cells
composed of a group of similar cells and the materials surrounding them
Tissue
Composed of two or more tissue types that perform one or more common functions
Organ
Group of organs that together perform a common function or set of functions and are viewed as a unit
Organ system
any living thing considered as a whole, composed of one cell
Organism
Why do we need fluid in cell?
Organelles can float inside the cell
• atoms combine to form molecules
MOLECULAR LEVEL
• molecules combine to make organelles
CELLULAR LEVEL
• group of cells work together to perform one or more specific functions
TISSUE LEVEL
4 basic tissue types
E, C, M, N
Epithelial, Connective, Muscle, and Nervous
• tissues working together to perform a function
ORGAN LEVEL
- organs work together to perform a function
* group of organ make a system
ORGAN SYSTEM LEVEL
- Group of system work together to make organism
* all organ system must work together to maintain life and health of the organism
ORGANISM LEVEL
means balance
maintenance of relatively stable internal conditions
HOMEOSTASIS
Main controlling systems of homeostasis
- Nervous system
* Endocrine system
• A disturbance in homeostasis results in disease
Homeostatic imbalance
3 components:
r, cc, e
receptor, control center, and effector
▪ Responds to changes in the environment (stimuli)
▪ Sends information to control center along an afferent pathway
Receptor