physiology life process

organism level

a multi-cellular life form made of organ systems

organ system level

a group of organs a structures that work together to perform functions

organ level

a group of tissues that form a functioning unit

tissue level

a group of cells with similar structure and function

cellular level

building blocks of life

chemical level

tiny chemical units that make up cells and are involved in many bodily functions

what are the 4 tissue types

epithelial, connective, muscle and nervous

epithelial tissue

lines surfaces for protection, forms glands to secrete fluid

connective tissue

fills spaces, structural support, stores energy

muscle tissue

contracts to produce movement and stores energy

nervous tissue

conducts electrical impulses and communication

what are tissues made up of

cells

what is an element

a pure substance made up of only one atom

atom

the smallest unit/particle of an element

molecules

two or more atoms chemically bonded together

what percentage of oxygen is in the body

65

what percentage of carbon is in the body

18.5

what percentage of hydrogen is in the body

9.5

what percentage of nitrogen is in the body

3.2

solids

all structures within all the cells of the body (40-45%)

fluids

all water within and outside of all the cells of the body (55-60%). this is the total body water (TBW)

fat tissue contains less water than what other tissue

muscle tissue

do individuals with a high muscle mass tend to have a higher total body water?

yes (about 60% of more)

what are the 2 subcategories of TBW?

intracellular fluid (ICF), extracellular fluid (ECF)

intracellular fluid

all fluid inside the cells (66%)

extracellular fluid

all fluid outside the cells (33%). comprised of 80% interstitial (in between cells), and 20% plasma (in blood vessels)