Given that,
The electric field is given by,

Suppose, B is the amplitude of magnetic field vector.
We need to find the complete expression for the magnetic field vector of the wave
Using formula of magnetic field
Direction of
vector is the direction of propagation of the wave .
Direction of magnetic field = 

We need to calculate the poynting vector
Using formula of poynting

Put the value into the formula


Hence, The poynting vector is 
Peak voltage is 2
period is 40ms
frequency = 1/period = 25Hz
Answer:
Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood. A protein called haemoglobin in the red blood cells then carries the oxygen around your body.
The question just basically explained what happens