B3
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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What is the CNS made up of?
Brain and spinal cord
What does the brain do?
Coordinates information and sends signals
What does the spinal cord do ?
Coordinates messages from the brain
What’s a stimulus?
A change in surroundings or environment
What do sensory neurones do?
Carry impulses from the receptors to the CNS
What do relay neurones do ?
Connect sensory neurones to motor neurones
What do motor neurones do?
Carry impulses from the CNS to the effector
What an effector?
A muscle or gland
What’s a receptor?
A cell that detects stimulus and has electrical impulses
What does the CNS do ?
Coordinates the response of effectors or the path of the nervous system
Why do we have reflexes ?
To protect us
Why do reflexes respond so fast ?
They don’t go to the brain
The stimulus us detected by the __________
Receptor
What is a hormone?
A chemical messenger
Where to hormones come from?
Electrical impulses
What 5 body parts make up the endocrine system?
Thyroid , adrenal, pancreas, ovaries, testes
What does the pancreas produce?
Insulin
How are hormones transported?
Through the bloodstream
What is homeostasis?
The maintenance of a constant internal condition
What is negative feedback?
A type of control used in homeostasis
What does thyroxine do ?
Regulates metabolic rate
What is glucose?
An energy store and a sugar
Why does adrenaline increase breathing rate?
For faster respiration (which prepares for fight or flight)
Adrenaline causes blood to be diverted from the _______
Digestive system