Multicellular Organisms - Nervous Control

Question 1

How are neurons specialised?

Answer 1

They allow fast communication between cells in different parts of the body by sending electrical impulses

Question 2

• List the 3 types of neuron
• What is the nervous system composed of?

Answer 2

• Sensory
  specialised to detect changes in environment (light, sound, etc.)
• Inter
• Motor
• composed of CNS and other nerves

Question 3

• What is the CNS composed of?
• Give 2 roles of the CNS

CNS - Central Nervous System

Answer 3

All the neurons that make up the brain and spinal cord.

• Processing sensory information (CNS receives electrical impulses from its connected sensory neurons )
• Coordinates the body’s response, by transmitting electrical impulses along motor neurons to glands and muscles.

Question 4

What is a stimulus?

Answer 4

• Information an organism is able to detect and respond to.
• Some effectors respond slowly (e.g. glands), some respond quickly (e.g. muscles)

Question 5

List and Describe the 3 main components of the brain

Answer 5

1. Cerebrum - Controls conscious thoughts, reasoning, memory and emotions
2. Cerebellum - Controls balance and coordinated movement
3. Medulla - Contains groups of neurons that transmit electrical impulses to the heart and lungs to control breathing rate and heart rate