Given a scientific question, generate a correct answer to it.

Ex Input:
How do glucose, ions, and other larger molecules leave the blood?

Ex Output:
through intercellular clefts

Ex Input:
The nervous system is characterized by electrical signals that are sent from one area to another. whether those areas are close or very far apart, the signal must travel along this?

Ex Output:
axon

Ex Input:
What is the measure of the force of gravity pulling down on an object called?

Ex Output:
weight