_____ IS MOSTLY USED AS A NOUN MEANING "A RESULT."

How does this photo _____ you? Does it make you want to yawn?

HOT BRAINS

In ancient times, people believed that yawning meant evil spirits were trying to get inside you. Interesting theory, but a more likely explanation for why you yawn is that your brain is hot.

Yawning brings cool blood into your skull, which has a cooling (affect/effect) on your brain. Why would you want that? Because brain temperature affects/effects how alert you feel. When your brain gets too warm, you feel drowsy. Now, you could dunk your head in a bucket of ice to perk yourself up--but why do that when a hearty yaaaaaawn will do the trick?

HOT BRAINS

In ancient times, people believed that yawning meant evil spirits were trying to get inside you. Interesting theory, but a more likely explanation for why you yawn is that your brain is hot.

Yawning brings cool blood into your skull, which has a cooling affects/effects on your brain. Why would you want that? Because brain temperature (affects/effects) how alert you feel. When your brain gets too warm, you feel drowsy. Now, you could dunk your head in a bucket of ice to perk yourself up--but why do that when a hearty yaaaaaawn will do the trick?

SLEEPY SIGHS

Until recently, it was thought that we yawn when we’re sleepy to refresh ourselves with a jolt of oxygen to the bloodstream. It turns out that this is probably not true. Research has not shown that yawning (affects/effects) the amount of oxygen in the blood.

The reason we yawn when we’re tired is probably that our brains are warmer right before and after we sleep. Now, someone get this owl a pillow!

CONTAGIOUS YAWNS

How many times have you yawned while reading this? Seeing a yawn, reading about a yawn, or just thinking about a yawn can trigger one.

No one is sure why other people’s yawns (affect/effect) us this way. Some researchers believe it has to do with empathy; a recent study shows you’re more likely to catch a yawn from someone you care about than from a stranger. But if you yawned looking at this page, then you know: Even the yawn of a seal can affect/effect you.

CONTAGIOUS YAWNS

How many times have you yawned while reading this? Seeing a yawn, reading about a yawn, or just thinking about a yawn can trigger one.

No one is sure why other people’s yawns affect/effect us this way. Some researchers believe it has to do with empathy; a recent study shows you’re more likely to catch a yawn from someone you care about than from a stranger. But if you yawned looking at this page, then you know: Even the yawn of a seal can (affect/effect) you.

The ______ of yawning on the body isn't well understood.