Nervous System And Sensory Organs Flashcards
What are the 5 sensory organs?
Sight, hearing, taste, touch
What are the functions of eyelids and eyelashes?
To keep objects, dust and small insects from entering the eye.
What is the white part of the eye called?
Sclera
What are the two functions of the cornea if the eye?
Helps bend incoming light.
Helps to focus.
Finish the sentence:
In the eye, small muscles contracts or relaxes to make __ ___ bigger or smaller.
The pupil
What part of the eye focuses light on the retina at the back of the eye?
Lens
Briefly describe the retina of the eye.
The retina contains many photoreceptors.
What are photoreceptors?
Photoreceptors are sensors that convert light into electrical impulses that is sent to the brain via nerve.
What are the two types of receptors?
Rods and cones
What is the function of the optic nerve in the eye?
The nerve sends signals to the brain which are perceived as colour, light and darkness.
How are we able to see?
Light, reflected from objects, enter the eye through the cornea and pupil.
Lens bends light to the back of the retina.
The photoreceptors convert the image to electrical impulses which is sent to the brain.
Brain interprets impulses into an image.
Name the three parts of the ear.
Outer ear, middle ear, inner ear
The outer ear contains two parts, name and describe them.
Ear lobe (pinna), funnels sound waves and reflects them into the auditory canal
Auditory canal, sound waves move through the auditory canal to the eardrum.
The middle ear contains 2 parts, name them
Eardrum, ossicles-hammer, anvil and stirrup
Which part of the inner ear controls balance?
Semi-circular canals
What does the cochlea of the ear contains?
Liquid and cells with small sensitive hairs called vibrating hairs
What function does the auditory nerve, of the ear,have?
When the hair cells sense movement in the liquid and they send information to the brain. The brain then interprets this information and leads to hearing different sounds.
Describe the tongue?
-movable muscular organ
- has taste buds on the surface
- plays a role in chewing and swallowing food
- plays a role in speech
The basic four tastes are butter, sour, sweet and salt, what is another fifth known as?
Umami, savoury
What are the 3 functions of the skin?
Protect
Control body temperature
Sense of touch
Receptors convert stimulus into impulses which is sent to _____
The brain
What is the function of the nose?
Breathing
Sense of taste
Smell
What does the cerebrum control?
Speech, senses, voluntary movement, memory, emotions, intelligence
Cerebellum maintains muscle coordination and what else?
Balance
