metabolism / endocrine control / homeostasis (wk 3) Flashcards
Adeno- what does the term mean?
means gland, eg Adenohypophysis = alternative name for the anterior pituitary gland
An- what does this term mean?
means without, eg anabolism = the process of building up molecules
Catabol- what does this term mean?
it means break down, eg catabolism = the breakdown of molecules into simpler ones
-crine, what does this term mean?
it means secrete, eg endocrine = secrete within
Endo- what does this term mean?
within, eg endocrine gland = gland that secretes hormones into the bloodstream
-genesis, what does this term mean?
formation or production, eg gluconeogenesis = the production of glucose from non carbohydrate sources
glyco-, what does this term mean?
sugar, carbohydrate, eg glycogen = a polysaccharide that serves as a form of energy storage
-lysis, what does this term mean?
break down, eg glycolysis = the breakdown of glucose into pyruvate
meta-, what does this term mean?
change or beyond, eg metabolism = all the chemical processes occurring within a living organism
pan- what does this term mean?
all, eg pancreas = a gland with both endocrine and exocrine functions
-trophy, what does this term mean?
growth, development - eg trophic hormone = one that stimulates production and release of hormones; for example thyroid stimulating hormone is one type of trophic hormone
what process involves the synthesis of complex molecules from simpler ones such as the building of proteins from amino acids, requiring energy?
anabolic processes
what process involves the breakdown of complex molecules into simpler ones, releasing energy?
catabolic processes
what is a catabolic pathway that breaks down glucose into pyruvate, releasing ATP in the process?
glycolysis
the final stage of cellular respiration, involves the transfer of electrons through the electron transport chain, leading to the synthesis of ATP?
oxidative phosphorylation
part of the cellular respiration in mitochondria, involves the further breakdown of pyruvate, generating more ATP and releasing carbon dioxide?
the TCA (or krebs or citric acid) cycle
what does metabolism refer to?
all the chemical reactions that take place within an organism to maintain life (anabolism, catabolism, ATP generation, glycolysis, oxidative phosphorylation…. the list goes on and on)
what do endocrine glands do?
produce and release hormones
what are hormones?
signalling molecules that regulate numerous physiological processes
what produces hormones that stimulate or inhibit the release of other hormones from the pituitary gland? (the pituitary gland secretes hormones that in turn, regulate other endocrine glands)
the hypothalamus
what travels through the bloodstream, binds to specific receptors on target cells or organs which then triggers a cellular response, influencing the function of the target tissue?
hormones
endocrine glands, feedback mechanisms, hormones, target cells or organs, pituitary gland, hypothalamus - all part of what system?
the endocrine system
what is an integral part of the endocrine system, involving the detection of hormone concentrations in the blood and subsequent adjustments to maintain homeostasis?
feedback loops
what is the connection between metabolism and the endocrine system?
the endocrine system regulates metabolism by signalling (via hormones) to increase or reduce aspects of metabolism - maintains homeostasis
Venous blood leaving the intestine doesn’t just drain directly into the vena cava – what happens to it?
all blood leaving the intestine (venous blood) is gathered into a network of veins called the hepatic portal system - brings all the nutrients to the liver
excess carbohydrate and fat, some vitamins, iron, copper - are they detoxified, stored, or synthesised in the liver?
stored
ammonia - is it stored, detoxified or synthesised in the liver?
detoxified (that’s toxic)
hepatic proteins, bile acids, clotting factors - synthesised, stored, or detoxified in the liver?
synthesised :)
Temperature regulation is an example of which kind of homeostatic feedback mechanism?
negative feedback - the controller responds to return the temperature to it’s normal set point
How can heat from the skin transfer to the environment?
- conduction (eg lying on cold floor)
- convection (eg light breeze over body)
- radiation (transfer of heat via infraed rays)
- also evaporation, if sweaty/panting
How do eating, digestion, absorption, and metabolism of nutrients result in heat production?
heat is a byproduct of all these reactions
What is the function of the endocrine portion of the pancreas?
pancreatic islets synthesise hormones and secrete them directly into blood
insulin is released from beta pancreatic islet cells, in response to what?
an increase in blood glucose (eg fed state)
glucagon is released from alpha pancreatic islet cells, in response to what?
low blood glucose, eg in fasting state (glucose gone = glucagon)
produced by neural tissue, secreted into a capillary network in the pituitary stalk - is it a releasing hormone or trophic hormone?
releasing hormone