10.7 The brain and our senses

Question 1

Role of the brain?

Answer 1

The brain acts as a coordinator.

Question 2

How does the brain act its role?

Answer 2

1. INTEGRATES and INTERPRETS the signals received from different sense organs
2. Produces sense
3. Decides on what action
4. Sends signals to muscles (through nerves) for RESPONSE

Question 3

Reaction time?

Answer 3

The time between detecting a stimulus and making a response is the reaction time.

Question 4

How many nerve cells in human brain?

Answer 4

10 billion nerve cells

Question 5

How are signals sent through nerve cells?

Answer 5

Nerve cells have long extensions that connect to each other. Signals are sent from cell to cell through these extensions.

Question 6

Cerebrum

Answer 6

Integrates and interprets (signals from sense organs)
Send signals (to muscles to make response)
Intelligence, memory, thinking

Question 7

Cerebellum

Answer 7

Coordinates muscles (body movements)
Body balance

Question 8

Medulla

Answer 8

Involuntary actions – basic life functions
» heartbeat, breathing, blood pressure

Question 9

Why illusion?

Answer 9

Brain interprets signals incorrectly

Question 10

Why does the tube look as if i goes through my hand?

Answer 10

Brain combines different images you see of right and left eye incorrectly.

Question 11

Animated illusion?

Answer 11

See series of slightly different images
Brain combines these images
Interprets them as a moving picture