B3.3

Question 1

What is the thermoregulatory centre?

Answer 1

Thermoregulatory:

• Regulates temperature

Question 2

Describe what body does when temperature increases ?

Answer 2

Temperature increases:

• Body temperature goes up
• Detected by receptor in skins
• Generates electrical impulse that thermoregulatory receives from sensory neurone
• Signal then sent down from motor neurone to effector

Question 3

What are responses for a hot day?

Answer 3

Responses for hot day:

• Sweat gland stimulated
• Blood vessels dilate so closer to skin, where cool air is
• Hair lays flat to reduce insulation

Question 4

What are responses for a cold day?

Answer 4

Responses for a cold day:

• Shivering
• Limit blood supply to blood vessel
• Hairs rise to trap air, which is an insulator

Question 5

What is vasodilation?

Answer 5

Vasodilation:

• Widening of blood vessels

Question 6

What is vasoconstriction?

Answer 6

Vasoconstriction:

• Constriction of blood vessels

Question 7

What happens when you eat food?

Answer 7

Eating food:

• Blood glucose level will rise
• Receptor cells in pancreas detect rise
• Pancreas releases insulin
• Insulin instructs liver to convert excess glucose to glycogen
• Soluble glucose molecules linked together to form glycogen

Question 8

What happens when you are hungry?

Answer 8

Hungry:

• Receptors detect fall
• Pancreas releases glucagon
• Glucagon acts on liver
• Causes glycogen to break down glucose chains to glucose molecules

Question 9

What is the ureter?

Answer 9

Ureter:

• Takes urine towards bladder

Question 10

What is the renal vein?

Answer 10

Renal vein:

• Carries clean blood
• Red

Question 11

What is the medulla?

Answer 11

Medulla:

• Contains loop of Henle and collecting ducts