physiology: homeostatsis

what is homeostasis?

maintaining an constant internal environment, regardless of external and internal factors

what is regulating ECF important?

it is needed to maintain life

why the the hierarchy of organization important?

if influences how the body communicates with each other

what is the total amount of water in the human body?

60%

what percent of the TBW is ECF?

1/3

what percent of the total body weight(TBW) is Intracellular fluid(ICF)?

2/3

what is 1/4 of the ECF?

plasma

what is 3/4 of the ECF?

interstitial fluid

what does ECF have a high concentration of?

Na+ , Cl-, Ca+

what does the ECF have a low concentration of?

K+

what separates the extracellular fluid (ECF) and intracellular fluid(ICF)?

plasma membrane

what separates plasma from interstitial fluid?

blood vessel wall

what are gap junctions?

communicating direct cell to cell

what is synaptic commuincation?

the process of neurons in the brain communicating with each other

what is autocrine signaling?

cell signals itself

what is paracrine signaling?

cell signals nearby cell

what is endocrine communication?

communication by endocrine cells releases chemicals (hormones) into the bloodstream

what is negative feedback?

a response to a change in the body that counteracts or opposes the initial change.

what is an example of negative feedback?

Insulin response to high blood sugar. If blood sugar rises, insulin is released to lower blood sugar.

what is positive feedback?

feedback that increases the output of a process.

how is positive feedback different than negative feedback?

positive feedback amplifies change while negative feedback reduces change