(a)[4]
Most carnivorous mammals need to move in order to hunt their prey. Outline why a carnivorous mammal relies more on its nervous system than on its endocrine system when it hunts.
(b)[3]
Fig. 9.1 shows a motor neurone. On Fig. 9.1, add label lines and the letters R, S and T to identify a part of the neurone that: - can become depolarised - use the letter R - contains many mitochondria - use the letter S - acts as an insulator - use the letter T.
(c(i))[3]
Fig. 9.2 gives a summary of the changes that happen during sarcomere contraction. Suggest an explanation for the curve’s shape that shows changes in the width of the sarcomere.
(c(ii))[3]
Suggest an explanation for the curve that shows changes in calcium ion concentration.