5.2 - 2015 June Q9 Answers
The diagram shows a side-view of the human brain.
(a) (i) Name the parts of the brain labelled A, B and C. (3)
A...........................................................
B...........................................................
C...........................................................
(ii) Which of these parts link the senses with the muscles that cause voluntary movement? (1)
(b) (i) Describe how information from the external environment is detected by the eye and then sent to the brain. (5)
(ii) The muscles in the iris adjust the size of the pupil to control the amount of light that enters the eye. Complete the table by writing either ‘contract’ or ‘relax’ in each box to show how the muscles in the iris respond to bright and dim light. (2)
A...........................................................
B...........................................................
C...........................................................
(ii) Which of these parts link the senses with the muscles that cause voluntary movement? (1)
(b) (i) Describe how information from the external environment is detected by the eye and then sent to the brain. (5)
(ii) The muscles in the iris adjust the size of the pupil to control the amount of light that enters the eye. Complete the table by writing either ‘contract’ or ‘relax’ in each box to show how the muscles in the iris respond to bright and dim light. (2)
(c) Describe the role of the hypothalamus in controlling body temperature. (3)