section 1. (5)Outline the role of the nervous system in detecting and responding to environmental changes

Question 1

What is the function of the nervous system?

Answer 1

coordination- it detects information about the organisms internal and external environment, transfers the information to the control centre and processes the information in the control centre to create a response

Question 2

What are the 2 parts of the nervous system?

Answer 2

1. the CNS (central nervous system)

2. the PNS (periphery nervous system)

Question 3

What is the CNS?

Answer 3

• consists of the brain and the spinal chord

- coordinates responses

Question 4

What is the PNS?

Answer 4

• consists of the nerves and ganglia outside the brain

- transmits information between the CNS and receptors/effectors

Question 5

What do receptors do?

Answer 5

receptors detect changes and transmit information about them in the form of electrochemical nerve impulses via sensory neurons to the CNS

Question 6

What does the CNS do with the information given to it by the receptors?

Answer 6

processes this information and passes it onto the effectors via motor neurons

Question 7

what are the 3 types of neurons?

Answer 7

1. sensory/ afferent neurons
2. interneurons
3. motor/ efferent neurons

Question 8

What do sensory neurons do?

Answer 8

o harness information from the different sensory organs such as the eyes, nose, ears, tongue and skin

Question 9

What do interneurons do?

Answer 9

o Serve as connectors of neurons
o Projection interneurons have long axons that join brain regions that are far from one another.
o Local interneurons feature shorter axons that create small circuits between near brain cells or regions.

Question 10

What do motor neurons do?

Answer 10

o Transmit signals from the brain to the spinal cord to the muscles to initiate action or response to stimuli.