U2 FILL IN THE GAPS

Professor: Class, let's see if you've been (1) _____ the nervous system. Elizabeth, would you answer a few questions for me?

• studying

• sending

• spending

• searching

Professor: First, what are the (2) ____ between neurons called?

• connections

• gaps

• cells

• transmissions

Student: Those are synapses, Professor. They enable the (3) ___ of information.

• create

• transfer

• stimuli

• reflexes

Professor: Very good. And what types of (4) ___ do synapses send?

• neurons

• signals

• information

• functions

Student: They send (5) ____ or electrical signals to another cell.

• biological

• historical

• chemical

• medical

Professor: Right again. So tell me, about how many synapses are there in the average (6) __?

• network

• spinal cord

• backbone

• brain

Student: Hmm... that's a (7) ___ one. I would guess about 100 billion.

• tough

• good

• fantastic

• compatible

Professor: Not quite. It's (8) _____ many times that - 100 to 500 trillion.

• completely

• actually

• finally

• exemmely

Student: Wow, that's a lot of (9) ____.

• connections

• information

• nerves

• synapses

Professor: Indeed. All that information (10) ____ is what makes the brain so powerful.

• voluntary

• record

• therapy

• exchange