Chapter 1 Flashcards
Hierarchy Of Biological Order
- Chemical Level
- Cellular Level
- Tissue Level
- Organ Level
- Organ System
- Organism
Anatomy
studies the structure of the body parts and their relationships to one another
Physiology
concerns the function of the body; how the body parts work and carry out their life-sustaining activities
Chemical level
atoms of elements > molecules
ex: elements molecules
- hydrogen, carbon, nitrogen -H2O
Cellular level
cell- the smallest unit of life
Tissue level
tissue- a collection of cells working together to perform a novel function
ex: muscle tissue
nervous tissue
Organ level
organ- a collection of tissues working together to perform novel function
Organ System
Organs that work together to accomplish a common purpose make up an organ system
ex: digestive system
or the heart and blood vessels of the cardiovascular system circulate blood continuously to carry oxygen and nutrients to all body cells
Organism
consists of a number of organ systems
- highest level of organization
- represents the sum total of all structural levels working together to keep us alive
Functions common to living things
metabolism
reproduction
responsiveness
maintenance of homeostasis
metabolism
the sum of a living things chemical reactions
-performed in order to GET and USE energy
reproduction
production of an entire living thing
- production of part of a living thing
ex: growth, repair - all reproductive processes require DNA (genetic info)
responsiveness
ability to recognize change in the environment (external or internal) and to react appropriately
Maintenance of Homeostasis
homeostasis- a state of balance, in which internal conditions change, but only within narrow limits, and despite external influence
ex: if body temp. is around 98.6 you are maintaining body temp. at homeostasis. 104 is to high, 94 is to low.
3 Parts of a Homeostatic maintenance system
- Receptor
- Control Center
- Effector