science Flashcards
What makes up the central nervous system?
The central nervous system consists of the brain and spinal cord
What makes up the peripheral nervous system?
Nerves that send messages from sense organs to the brain and spine, plus nerves that connect from the brain and spine to the muscles and glands.
How does the nervous system allow us to respond to stimuli?
Stimulus, receptor, coordinator, effector, response.
What receptors are involved and what happens if you cut your hand?
Need to mention the brain and spinal cord
The first thing that is detected is your pain, The nerve cells sends a message via the spinal cord to the brain. the message is in the peripheral nervous system.
Description and function of the cornea
Transparent covering for the front of the eye.
Can focus the light and functions as a fixed lens.
Description and function of the pupil
It is the black hole in iris where light enters
The pupil size is controlled by iris muscles
When the eye needs more or less light to enter the pupil gets larger and smaller
Description and function of the iris
Coloured part of eye
Controls light entering
circular muscled
Description and function of the sclera
A tough white skin that covers all the eyeball
Supports eyeball
Provides attachment for muscles
What is the blindspot?
It is the spot where your optic nerve connects to your retina. It has no light sensitive cells so you can not see anything.
Explain what is ASTIGMSTISM means?
It is when the eye cannot focus an object’s image on a single point on retina. The cornea is oval instead of spherical.
What are the 3 main parts of the ear?
Outer, Middle and Inner ear.
How does the auditory nerve inside the inner ear work?
It sends the impulses from the hairs in the cochlea to the brain. Our brain can notice these as sound
What are papillae and what do they do?
The bumps on your tongue are called papillae. They help grip food and also contain your taste buds. each has 200 or more taste buds
How does the fight, flight or freeze response work?
It is an forced reaction, it exists to keep people safe, preparing them to face, escape or hide from danger. People react to perceived threats in different ways.
Where are the olfactory receptor cells located?
In the nose – they are a special type of cell
Olfactory receptor cells are a special type of neuron
