Q: Does "air" have the same meaning in the following two sentences?

Air pollution.

There was a tension in the air which made me suspect an approaching storm.

A: the same meaning

Q: Does "head" have the same meaning in the following two sentences?

Tickets are $5 per head.

We will consider performance issues under the head of future improvements.

A: different meanings

Q: Does "life" have the same meaning in the following two sentences?

She's my love, my life.

He could no longer cope with the complexities of life.

A:
different meanings