Physiological Homeostasis (4)

Question 1

Vasodilation and increased sweating

Answer 1

Responses to increased body termperature

Question 2

Vasoconstriction shivering, contraction of hair erector muscles

Answer 2

Responses to reduced body termperature

Question 3

Ectotherms

Answer 3

Animals which derive most body heat from surroundings e.g. reptiles, fish

Question 4

Endotherms

Answer 4

Animals which derive most body heat from internal metabolism e.g. mammals, birds

Question 5

Glycogen

Answer 5

Storage carbohydrate in liver

Question 6

Pancreas

Answer 6

Organ which detects changes in blood sugar and produces insulin and glucagon

Question 7

Hypothalamus

Answer 7

Temperature monitoring centre which communicates to effectors via nerves

Question 8

Vasodilation

Answer 8

Opening up of arterioles near skin surface to increase blood flow to skin when body temperature rises

Question 9

Vasoconstriction

Answer 9

Reduction of blood flow to skin when body temperature falls

Question 10

3 responses in mammals to overheating

Answer 10

Increased sweating, Vasodilation and Hairs flat to skin

Question 11

3 responses in mammals to overcooling

Answer 11

Decreased sweating, Vasoconstriction and Hairs raised

Question 12

Sweat cools body

Answer 12

Evaporation of a liquid needs heat, which it takes from the body