7.6 State one way in which the grade 10 learners ensured the reliability of this investigation. (1)

2.4 Anaerobic respiration produces more energy than aerobic. (1)

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 Internal intercostal muscles Ribs move down and in Diaphragm Volume of thorax Volume of air in lungs

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

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

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:

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)

QUESTION 5 – FILL IN THE BLANKS

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