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

Biology Topic 1: Maintaining a Balance > section 1. (5)Outline the role of the nervous system in detecting and responding to environmental changes > Flashcards

Flashcards in section 1. (5)Outline the role of the nervous system in detecting and responding to environmental changes Deck (10):
1

What is the function of the nervous system?

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

2

What are the 2 parts of the nervous system?

1. the CNS (central nervous system)
2. the PNS (periphery nervous system)

3

What is the CNS?

- consists of the brain and the spinal chord
- coordinates responses

4

What is the PNS?

- consists of the nerves and ganglia outside the brain
- transmits information between the CNS and receptors/effectors

5

What do receptors do?

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

6

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

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

7

what are the 3 types of neurons?

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

8

What do sensory neurons do?

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

9

What do interneurons do?

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.

10

What do motor neurons do?

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