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Sir Gawain volunteers to take the Green Knight’s challenge so Arthur won’t have to, and the court agrees.

The partial pressure of carbon dioxide is higher:

Suppose you needed to design a cell membrane that would PREVENT the movement of gases across it as much as possible.  Which of these membranes would work best? The arrow indicates the direction that air needs to move.

Which of these is a cell of the innate immune system?

Discuss the different ways that antibodies can attack pathogens in the body.  (Hint: they have a P.L.A.N.)

Atmospheric air on Tatooine is made up of the following gases:  Gas Percent Volume Nitrogen 74 % Argon 11.5 % Water vapor 7 % Oxygen 5.5 % Carbon monoxide 3 % Put these atmospheric gases in order from highest to lowest partial pressure on Tatooine:  

If the sO2 of Alderaan’s aliens’ venous blood is normally 40%, how many O2 molecules does each hemoglobin molecule give up during a single pass through their systemic circuit?  (Remember, the hemoglobin binds ten O2 molecules when fully saturated).

An immune cell sprouts a receptor that looks like this: Would the receptor be immunocompetent for an antigen that looks like this:

Because you have no immunity to Hep A you get the vaccine for it.  Your body responds to the vaccine as if it were the live virus.  This is a _______________________ response. 

What is the direction of the beam for a lateral elbow?