Homeostasis

Question 1

Blood glucose concentration regulation

Answer 1

-Pancreas detects and islets of Langerhans release insulin from the b cells and glucagon from the a cells
-Adrenaline causes more glucose to be released from the hydrolysis of glycogen in the liver

Question 2

How does insulin lower blood glucose

Answer 2

-Liver cells become more permeable to glucose
-Enzymes are activated to cause glycogenesis
-Glucose to glycogen

Attaches to receptors to change tertiary structure of channel proteins so more facilitated diffusion , vesicles containing glut 4 glucose channel protein fuse with cell surface membrane

Question 3

How does glucagon increase blood glucose

Answer 3

-Activates enzymes to hydrolyse glycogen
-Glycogen hydrolysed to glucose

Attaches to receptor to change shape into adenylate cyclase and converts ARP into cyclic ATP which activates Kinase protein to hydrolyse glycogen and also activates enzymes in gluconeogenesis

Question 4

How does adrenaline increase blood glucose

Answer 4

-Causes G protein to be activated and convert ATP into CAMP