Corrections from Tests/Mark Scheme Q's

Question 1

Explain the skin’s response to cold temperatures involving blood vessels (mark scheme answer)

Answer 1

Capillaries/blood vessels NARROW, so LESS blood flows close to surface of skin, so LESS heat is lost through radiation.

Question 2

Explain skin’s response to cold temperatures involving hairs.

Answer 2

Erector muscles contract, so hairs stand on end, trapping a THICKER layer of air; air is an insulator, so LESS heat can escape.

Question 3

State the organ that controls reaction time

Answer 3

Brain

Question 4

State what is meant by the term ‘invertebrate.’

Answer 4

Invertebrates do not have a BACKBONE.