Human Biology- Nervous system

Stimuli

A stimuli is any information that the body receives that have that can cause a physiological or behavioural response

Receptors

Detect stimulus or change in normal functioning of body sends and sends info to brain.

Sight

Stimuli- light, organ- eyes, receptor- photoreceptors

Hearing

Stimuli- sound, organ- ear, receptor- mechanoreceptors

Taste

Stimuli- sweet, sour, salty , organ- tongue, receptor- chemoreceptors

smell

Stimuli- odour particles , organ- nose, receptor- chemoreceptor

touch

Stimuli- pain, pressure, hot and cold, organ- skin, receptor- mechanoreceptors and thermoreceptors

The nervous system and 2 main parts

the communication system that controls the body
include:
- CNS
- PNS

CNS

brain and spinal cord, Control centre of the body, receives info from all over the body, processes the info and sends out message to respond

PNS

nerves, limbs & organs,

Brain

process internal and external info for the body which makes decisions and processes thoughts, memories and emotions. Protected by the skull

Spinal cord

long, thin bundle of nerves, connects brain to body, carries messages between brain and body. Its protected by vertebrae column

frontal lobe

located at front, functions include reasoning, emotions, movement and problem solving.

parietal lobe

top of brain, function: taste, pain, temperature, touch and spatial awareness.

temporaral lobe

located at sides of brain, functions include organising and remembering info (language, smell, sound, facial recognition)

occipital lobe

back of brain, vision, distance, depth, location and identity of object

cerebellum

base of cerebrum, controls coordination and balance

brain stem

base of brain that connects to spinal cord, vital functions- breathing, blood pressure and heart rate.

spinal cord

kink to brain and nerves of PNS, protected by the bones of the spinal column called vertebrae.

PNS division

Somatic nervous system and autonomic

Somatic nervous system

collects info from receptors in our sense organs, coordinates movement of body in response (done by controlling voluntary muscle movement)

autonomic nervous system

controls involuntary actions of body, actions include: Heartbeat, digestion, respiration, salivation, pupil size,