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Physio Ch. 1
Question | Answer |
---|---|
cell membrane is for | boundary |
cytoplasm is..and contains... | outside nucleus/inside cells ...cytosol |
organelles are like the | organs of the cell |
nuclui have the | blueprints |
inclusions are | storage areas ex. glyocgen storage |
4 categories of cell types | epithelial, muscular, nervous, connective |
tissues correspond to | cell types |
organs are made of | two or more tissues |
organs have...such as... | functional units...nephron in kidney and capillaries |
circulatory system does...of... | transport...nutrients, wastes, hormones, electrolytes, gases |
respiratory is | gas exchange between outside and inside body |
digestive system breaks | down food and absorbs it |
urinary | cell waste excretion |
musculoskeletal | movement/head production/protection |
immune | protection from pathogens and search/destroy cancer cells |
nervous system performs | integration, regulation and communication at a fast rate |
endocrine | same as nervous but slower rate |
reproductive | produce gametes and maintain baby |
integ | protection, thermoregulation, excretion of cellular waste |
organisms are made up of | multiple organ systems |
cells | perform the job |
cells are capable of | basic life functions such as metabolism and reproduction |
organisms reli on cells for...and organs/organ systems for... | performance of basic life function...providing cells with requirements |
external environment is considered...and is our.. | variable...source of nutrients and location of waste disposal |
internal environment is considered | relatively stable or predictable |
internal environment is responsible for | maintenance of extracellular fluid for exchange |
internalenv. is in contact with | cells |
body fluid compartments | extracellular and intra |
extracellular has | plasma (fluid component of blood) and interstitial fluid (inbetween cells) |
interstitial fluid is in the | interstitium |
intracellular fluid is made up of | cytosol |
plasma and interstitial fluid at the level of the tissue...but... | are basically identical...plasma has a higher protein content |
intracellular fluid components...and have different... | vary by cell type (exocrine glands = oil, sebaceous, sweat)...proteins, ions, etc |
adipose = | ct |
dct = | collagen |
approximately ....% of total body weight is fluid. what is the makeup | 60...2/3 is intra, 1/3 is extra (1/5-1/4 = plasma, 4/5-3-4= interstitial fluid) |
fluid moves | among compartments (plasma and interstitium and extra/intra) |
homeostasis is the | maintenance of aphysiological variable within an acceptable range (relatively constant internal environment regardless of external environment) |
example of homeostasis in blood glucose | level should be 60-120 mg/dL of blood which insulin decreases |
homeostatic ranges | exists for many variables |
pathophysiology | inability to maintain a variable within its homeostatic range |
homeostasis is...not.. | dynamic...static |
disturbing a physiological variable means | the body will compensate regulatory responses to return it to within the acceptable range |
dynamic constancy | constantly changing |
short term... | variation w/ long term stability |
example of maintaining homeostasis: blood glucose levels rise...and fall...so it requires interaction among several systems | above normal levels after a meal...below normal levels after fasting...nervous, endocrine, cardio, digestive |
homeostatic controls are | involuntary |
set point | steady state which requires energy added constantly |
maintenance of a set point for temp | balance heat loss with heat gain |
negative feedback systems turn | on then off |
- feedback can occur at the level of the | molecule, cell (control building and destroying) and the organ |
cortisole production as example for - feedback: cortisol is a...and is...so it does... | hormone that helps other hormones...necessary but potentially harmful at high levels...negative feedback inhibition |
what would happen to the body if temp was not controlled by neg feedback? | overheating |
positive feedbac systems are... | turned on then reinforced to completion |
examples of + feedback systems | neuron action potentials, uterine contractions, blood clot formation |
resetting set points: set points are maintained..and reset.. | for a reason (to maintain homeostasis) |
fevers are an example of resetting the set point | body increases temperature to kill the pathogen |
blood iron levels are an example of resetting the set point | body resets blood iron levels to prevent bacteria from replicating |
feedforward regulation is considered | preparatory regulation |
examples of feedforward | athletes heart rate and breathing rate, smell of food stimulating stomach acid production |
reflexes are a means of regulating | homeostasis |
reflexes are | specific, involuntary and unlearned |
reflex arc components | afferent pathway, integration, efferent pathway |
afferent pathway is where the...is recieved by the... | stimulus...receptor (chemical, baro, stretch, light, etc) |
an internal stimulus would be | blood glucose, temperature |
the integration center is the | neural or endocrine systems |
efferent pathway is where the...is sent to the... | response...effector |
local homeostatic responses consist of | local control within a tissue |
local detection, integration and action steps | stimulus at the receptor, integration in the immediate vicinty, not neural or endocrine, effecter produces the response |
example of local homeostatic control: increased oxygen demand in cells ->...-> | nitric oxide released...local blood vessel dialation |
intercellular chemical messengers | hormones and paracrine agents |
hormones are secreted into the..or the... | blood (endocrine glands)...synapse |
hormones have to have | receptors or target cells |
endocrine glands -> | target cells through the blood |
neurotransmitters go from | neuron terminal to the next cell |
what chemical messengers are secreted into the synapse? | neuron->neuron, neuron -> muscle cells, neuron->gland cells |
paracrine agents impact | adjacent cells |
paracrine agents are secreted into | interstitial fluid |
autocrine is also secreted into...but these bind to... | extracellular fluid...the cell that secreted it. The binding triggers activity |
processes related to homeostasis include | adaptations, biological rhythms, chemical homeostasis |
adaptations are...ability to... | inherited or genetic...survive in specific conditions |
homeostatic controls are | biological adaptations |
acclimatization is the ability to...and... | adjust...improve homeostatic control for specific conditions |
example of acclimatization would be beginning to.. | sweat earlier and adjust sweat composition when experience repeated heat or exercise periods |
biological rhythms are also called | circadian rhythms (regular daily cycle) |
circadian rhythms last | 24 hours |
circadian rhythms...on its own w/o...which means it is... | automatically resets...external cues ... free running |
free running circadian rhythms depend on the...,...,... | hypothalamus (suprachiasmatic nucleus) as pacemaker...pineal gland...melatonin |
circadian rhythms are internally...but can be..which is defined as... | driven...influenced by external cues...entrainment |
natural sleep-wake cycle free running is | 25 hours |
society sets sleep-wake cycle to...because of... | 24 hours...entrainment JET LAG |
chemical homeostasis is the movement of materials | into, within and out of body |
toxins are stored in | adipose tissue |
negative balance | out > in (sweating, calcium) |
positive balance | in > out (sodium, some vitamins that are fat soluble) |
stable balance | in = out |