chapter 1: the human body, an orientation Flashcards
structural organization
anatomy
examination of relatively large structures & features usually visible with the unaided eye
gross anatomy (macroscopic)
structures that can’t be seen without magnification
microscopic anatomy
the how of the body & how it works
physiology
does structure determine function or function determine structure?
structure determines what functions can take place
necessary life functions
- maintaining boundaries
- movement
- responsiveness (irritability)
- digestion
- metabolism
- excretion
- reproduction
- growth
boundaries separate the “inside” from the “outside”
maintaining boundaries
locomotion, movement of substances
movement
ability to sense changes & react
responsiveness (irritability)
breakdown & adsorption of nutrients
digestion
chemical reactions within the body
a. breaks down complex molecules into smaller ones
b. builds larger molecules from smaller ones
c. produces energy (ATP)
d. regulated by hormones
metabolism
eliminates excreta (waste) from metabolic reactions
- wastes may be removed in urine, feces, or sweat
excretion
new cells are used for growth & repair
cellular reproduction
handled by the reproductive system
organismal reproduction
increases cell size or body size through increasing the number of cells, hormones play a major role
growth
survival needs
- nutrients
- oxygen
- water
- stable body temperature
- atmospheric pressure
chemicals for energy & cell building
- includes carbohydrates, proteins, lipids, vitamins, & minerals
nutrients
required for chemical reactions
oxygen
60 to 80% of body weight, most abundant chemical in the human body, provides for metabolic reactions
water
stable body temperature
37 º C or 98 º F
must be appropriate for gas exchange
atmospheric pressure
levels of structural organization
- chemical
- cellular
- tissue
- organ
- organ system
- organismal
atoms combine to form molecules
chemical level
cells are made up of molecules
cellular level
tissues consist of similar types of cells
tissue level