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Indicate 3 barriers that form the first line of defense of the Immune System:

What does interferon do?

15   A crane is being used to lift containers off a ship. One container has a mass of 14 000 kg and is being lifted vertically with a speed of 3.2 m s–1.     The electric motor being used to supply the power to lift the container is using a current of 240 A at a potential difference of 2200 V.     What is the efficiency of the system? (1)   A      8.1%       B         8.5%                C         48%                 D         83%      

28 Which graph shows the variation with current I of the potential difference V of a filament lamp? (1)   Right click to open image in a separate tab.  

25 Which statement about ultrasound is correct? (1)   A     It has a higher frequency than audible sound, and it is a longitudinal wave. B     It has a higher frequency than audible sound, and it is a transverse wave. C     It has a lower frequency than audible sound, and it is a longitudinal wave. D    It has a lower frequency than audible sound, and it is a transverse wave.  

An arterial line uses a transducer to continuously monitor heart rate and blood pressure.

Fever is the body’s way of killing infection by heating up the blood and “cooking” the bacteria.

What is a normal resting pulse rate for adults?

Who is more likely to have high blood pressure?

What is the volume of air inhaled and exhaled during one respiratory cycle?