Homeostasis

Question 1

components of homeostasis

Answer 1

• neuronal synapse
• action potential

Question 2

insulin feedback loop

Answer 2

• stimulus - blood glucose level 5.5mM
• sensor - endocrine pancreatic b cells detect excess glucose in the bloodstream
• control - pancreatic b cell release insulin into bloodstream
• effector - insulin activates GLUT4 transport proteins in skeletal muscle fibres, adipocytes and hepatocyes
• glucose consumed, converted to glycogen, removed from blood
• decrease in conc detected by pancreatic a cells
• insulin release stops
• blood glucose does not drop

Question 3

what does the autonomic nervous system maintain? (8)

Answer 3

• HR
• RR
• perspiration
• digestion
• salvation
• urination
• sexual arousal
• pupil diameter

Question 4

parasympathetic nervous system: positive or negative feedback?

Answer 4

• negative

Question 5

SNS positive or negative feedback?

Answer 5

• positive

Question 6

what happens in negative feedback?

Answer 6

• end result inhibits the original action
• eg. less heat

Question 7

what happens in positive feedback?

Answer 7

• the end result amplifies the original action
• eg. more contractions, more clotting

Question 8

what is homeostasis?

Answer 8

• ongoing maintenance of equilibrium state in a cell or organism
• maintained by biochemical processes that balance each other