Parts of the Nervous System
What are the main organs of the nervous system?
Brain, spinal cord
What does the nervous system control?
Body movements, thoughts, reflexes, etc.
Give an example of a reflex.
Knee-jerk, blinking, etc.
What happens in paralysis?
Loss of movement in a body part.
True or False?
The brain feels pain.
False, it has no pain receptors.
What are the two main parts of the nervous system?
CNS & PNS
Which part of the nervous system works automatically?
Autonomic Nervous System
Why are reflexes faster than normal actions?
They don’t go to the brain first.
What disease affects memory and is common in older people?
Alzheimer’s
How many neurons are in the brain?
About 86 billion! As stars
What part of the brain controls balance?
Cerebellum
What happens when you touch something hot?
Reflex action
What is the function of sensory neurons?
Carry signals to the brain/spinal cord.
What disorder causes sudden uncontrolled movements?
Epilepsy
Which animal has the largest brain?
whale
What is the function of the spinal cord?
Sends messages between the brain and body
What type of neuron carries messages to muscles?
Motor neuron
What part of the nervous system controls involuntary functions like heartbeat?
Medulla/Brainstem
What is the role of interneuron in a reflex actions?
Connects sensory and motor neurons
True or False: The brain is the fattest organ in the body.
True! It’s about 60% fat.
What are the three types of neurons?
Sensory, Motor, Interneuron
What part of the brain is responsible for memory, thinking, and voluntary movement?
Cerebrum
What happens if the spinal cord is damaged?
Loss of movement, paralysis
Why are reflexes important for survival?
They protect the body from danger.
Which animal has the longest nerve?
The giraffe