Anatomy and Physiology: The Nervous System

The Nervous System

• The nervous system consists of two major subsystems: the central nervous system and the peripheral nervous system.
• The central nervous system includes the brain and spinal cord, while the peripheral nervous system includes nerves that connect the central nervous system to the rest of the body.
• Neurons, also known as nerve cells, transmit information through axons.

Grammar and Vocabulary

Its, It's, Their, There, They're

• Its is a possessive pronoun, meaning something belongs to it.
• It's is a contraction of "it is" or "it has".
• Their refers to something belonging to them.
• There refers to a location or direction.
• They're is a contraction of "they are".

Verb Tenses

• Present Simple: used to describe habitual or regular actions.
  • Examples: My brother travels to Alexandria with me next week, The men repair the roof, The water boils.
• Present Continuous: used to describe actions that are happening at the moment of speaking.
  • Examples: The cat is playing with its toy, She is running because she's late for her lesson.
• Future Simple: used to describe actions that will happen in the future.
  • Examples: The moon goes round the earth in 27 days, The flight number BA 308 from London to Los Angeles leaves at 9 a.m.
• Present Perfect: used to describe actions that started in the past and continue up to the present.
  • Examples: My wife and I have a party this weekend, We've already bought the drinks and sent the invitations.