Parts Of The Nervous System

Question 1

How much of the nasal cavity is used to filter the air you smell before it goes into your lungs?

Answer 1

95%

Question 2

What is an olfactory epithelium?

Answer 2

It is a little patch of skin that’s key to everything you smell.

Question 3

What are olfactory receptor cells?

Answer 3

Special neurons that sense smells

Question 4

How can you tell how well a species smells?

Answer 4

How big their olfactory epithelium is

Question 5

How often do olfactory epithelium get replaced?

Answer 5

Every 4 to 8 weeks

Question 6

What is the body system that senses the environment and controls actions?

Answer 6

The nervous system

Question 7

What is the two main divisions the nervous system is made up of?

Answer 7

The central nervous system. The peripheral nervous system.

Question 8

What nervous system consists of the brain and spinal cord?

Answer 8

The central nervous system.

Hint: Central = centre. Centre of the body = brain and spinal cord

Question 9

What does the peripheral nervous system consists of?

Answer 9

Bundles of nerves that sends messages between the central nervous system and the muscles and glands.

Question 10

Explain how your body deals with a cockroach running over your foot using the sensory input, motor input and Interneurons theories

Answer 10

Sensory Input is feeling a cockroach over your foot, sensing it with sensory receptors. 

Integration is how the nervous system processes and decides what should be done. Are you going to freak out about the cockroach or let it walk over your foot.

Mortory input is the response that occurs when your nervous system activates parts of your body. For example your foot kicking off the cockroach. 

Question 11

What nervous system uses sensory input, integration and motory input?

Answer 11

The peripheral nervous system

Question 12

What is the difference between the somatic nervous system and the autonomic nervous system?

Answer 12

Somatic = Voluntary 
Autonomic = Involuntary

Question 13

Explain Somatic Nervous System

Answer 13

Uses your skeletal muscle movement

Question 14

Explain Autonomic Nervous System

Answer 14

It keeps your heart beating, your lungs breathing. It’s AUTOmatic

Question 15

What is a neuron?

Answer 15

They respond to stimuli and transmit signals.

Hint: Translate = makes sense of a different language
Transmit = makes sense of a signals from PNS.

Question 16

What do dendrites do?

Answer 16

They pick up signals from other neurons (out of their axon endings)

Easy: branches that receives messages

Question 17

What is the purpose of the axon in the neuron?

Answer 17

It carries the impulse to the axon terminal

Question 18

What is the myelin sheath

Answer 18

A fatty layer that insulates the axon

Question 19

What are the nodes of Ranvier

Answer 19

The gaps between the Myelin sheaths

Question 20

Describe two differences between the central nervous system and the peripheral nervous system.

Answer 20

The central nervous system receives sensory information. The peripheral nervous system sends the sensory information.

The central nervous system includes the brain and spinal cord (the centre of it) whereas, the peripheral nervous system includes the cell bundles.

Sensory input
Interneurons
Motory
=PNS

Question 21

What is the purpose of the Myelin Sheath?

Answer 21

It allows the impulses that the axon is carrying to the terminal to transmit quickly and efficiently.

Question 22

What does the nodes of ranvier do?

Answer 22

Make the nerve impulses easier for the myelin sheath to carry impulses rapidly.

Question 23

What is the purpose of the nucleus?

Answer 23

It controls and regulates the activities of the cell.