hormonal co-ordination in animals

Question 1

what 2 hormones does the pancreas produce?

Answer 1

• insulin
• glucagon

Question 2

what happens when glucose levels are too high?

Answer 2

• insulin is secreted by the pancreas
• liver converts glucose into glycogen which is stored in liver and skeletal muscles
• glucose levels then go down as glucose is removed from blood

Question 3

what happens when glucose levels are too low

Answer 3

• glucagon is secreted by pancreas
• liver converts glycogen into glucose
• glucose level rises as glucose is released in to the blood from the liver cells

Question 4

hypotonic definition

Answer 4

higher water potential on the outside of the solution

Question 5

hypertonic definition

Answer 5

higher water potential in inside of the solution

Question 6

define endocrine gland

Answer 6

organ that produces + secretes specialised chemical messenger molecules called hormones

Question 7

explain the role of ADH in the production of concentrated urine (4 marks)

Answer 7

• when wart content of blood plasma is too low it is detected by osmoreceptors in the hypothalamus
• the pituitary gland will then secrete more ADH
• ADH increases the permeability of the tubules
• more water is re-absorbed into the blood plasma by osmosis down the water potential gradient