5.1 Complete the table, which shows what happens in the thorax during ventilation of the lungs. Two boxes have been completed for you. (10)   Action during inhalation Action during exhalation External intercostal muscles contract [1] Internal intercostal muscles [2] [3] Ribs [4] move down and in Diaphragm [5] [6] Volume of thorax [7] [8] Volume of air in lungs [9] [10]

6.1 Name two of the blood vessels that carry blood away from the heart. (2)

10. The diagram shows the human heart with four chambers and four blood vessels labelled A to H.   Right-click on the button below to open the image in a new tab:

9.4 Explain the role of ADH when there is too little water in the blood. (5)

10.4 When a person is vaccinated, their immune system produces memory cells. Describe the role of memory cells. (3)

7.7 State two factors that should be kept constant in this investigation. (2)

2.2 Anaerobic respiration in muscles release carbon dioxide. (1)

QUESTION 5 – FILL IN THE BLANKS

7.1 Identify the apparatus shown above. (1)

10.2 Explain why the walls of the right and left ventricles differ in thickness. (2)