yr9 body systems

endocrine and nervous systems like that

what is the nervous system composed of?

central nervous system (CNS) and peripheral nervous system (PNS)

what is the CNS composed of?

the brain and the spinal cord

what is the PNS composed of?

all the nerves that are not in the central nervous system (CNS)

what is the purpose of the CNS

to decide what to do with incoming sensory information and to coordinate responses through muscles or glands

what is the purpose of the PNS

to connect the CNS to limbs and organs, and facilitate communication between the brain and the rest of the body.

this note is meant for an image of nervous system for labelling

what are the difference between sensory neurons, interneurons and motor neurons?

Sensory neurons (or receptors) transmit sensory information to the CNS, interneurons transmits this information within the CNS, and motor neurons carry signals from the CNS to effectors (muscles and glands)

what are some examples of neurotransmitters (this is for the syllabus pls memorise)

serotonin and dopamine

label

limbic system please refer to book for diagram

why does a reflex action work so quickly?

reflex actions work quickly as they bypass the brain, and instead go to the spinal cord for a faster response, as spinal cord also has relay/inter neurons, which can directly send signals to effectors