haha

Question 1

Have you ever had goose bumps on your arms when you were cold?

Question 2

When you encounter cold temperatures, the muscle cells in your skin contract.

Question 3

then bumps form, and the hairs on your arms rise up and trap air.

Question 4

The trapped air insulates your skin and helps you feel warmer.

Question 5

How do your muscle cells know to contract?

Question 6

When you first feel the cold, a message is sent to your brain, which is part of your nervous system.

Question 7

Your brain then sends a message to your skin’s muscle cells, and the goose bumps form.

Question 8

The nervous system is the part of an organism that gathers, processes, and responds to information.

Question 9

The basic units of the nervous system

Nerve Cells

Question 10

Your nervous system gets information from your five senses.

Question 11

Sense receptors respond to changes in the environment.

Question 12

They send signals to the brain.

The brain is the control center of the body.

Question 13

Your brain receives information and processes it.

Then it sends out a response.

Question 14

Your brain also stores some information as memories.

Question 15

Sense receptors respond to changes in the environment

Question 16

The nervous system reacts quickly.

It can receive information, process it, and respond in less than one second.

Question 17

Signals received by the nervous system can travel as fast as some airplanes.

This is around 400 km/h (249 mi/h)!

Question 18

Your nervous system has two parts: the central nervous system and the peripheral (puh RIH frul) nervous system.