[EinNYC]

This is what I have to see every single day in classrooms.

"Here are some of the differences between the different types of blood vessels.

(1) Arteries have thicker walls than do veins.

(2) Veins have valves to prevent backflow of blood.

(3) Capillaries have walls only a cell layer thick to make it easy for things to diffuse.

OK, class. Which type of blood vessel would most likely be involved in gas exchange? Remember, that means diffusing through a membrane."

A bunch of blank stares.

[Doctor 2Brains]

Cap’s?

[informavoracious]

You asked in the wrong language! Try this:

k, cls. whch type bld vsl wd mst likly b invlvd in gas xchg? rmbr that mns dfusng thru a membrn.