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science lab quiz
Terms in this set (28)
Name two categories of senses
Somatic sensations and special senses
How are senses accessed
Senses are accessed via the sensory system of the
central nervous system.
What do sensory cells detect and where do they give signals to
Sensory cells detect stimuli from external and internal
environments transmit signals to the nervous system
Where do all nerve signals go.
All nerve signals are transmitted to the central nervous system (brain + spinal cord)
Where are central nerves located
Brain and spinal cord
A nerve cell = _______
Nerons 3 parts
•Cell Body-contains the nucleus
and genetic information
coming to the nerve cell body.
•Axons- carry the signal away
from the nerve cell body.
what 2 chemicals are involved in passing along a stimulus
Steps for signal movement down the axon
1.When a stimulus is reached, protein channels are opened
2.Sodium outside the cell rushes in
3.Potassium inside the cell rushes out of the cell
4.Above steps continue down the length of the axon causing the signal to be conducted.
•Acoustical reception =
• Olfaction =
•Acoustical reception = hearing
•Olfaction = smell
•Gustatory = taste
•Mechanoreception = touch
How does the nervous system distinguish different stimuli
from what part of the brain the signal is coming from.
Lights rays meet at the back of the eye stimulate
2 main parts of the eye
Optic Nerve- transmits a signal
from the eye to the brain
•Retina: contains photoreceptors
•Rods- detect very dim light
•Cones- detect bright light and
Why does the eye need to be perfectly
The cornea bends (refracts) light rays
and helps focus the light onto the retina in
the back of the eye.
If the eye isn't round, there will be
multiple focal points instead of just one.
nearsightedness;cant see far away
farsightedness (can't see close up)
What vibrates in the ear
hair cells in the ear respond to vibrations
Why do hair cells bend
Hair cells bend due to direct or indirect vibrations
Which nerves transmit signals to the brain
Auditory nerve transmits signals to the brain
Brain processes information and may determine source and type of
sound that created the stimulus
What are the two types of hearing loss
1. Sensorineural - nerve deafness
•sound receptors or neurons
•due to age or prolonged
exposure to loud noises
•sound vibrations cannot reach
the inner ear
What are the 4 types of touch receptors
How is smell detected?
Detection of different molecules of different receptors in the nose.
What allows you to smell
Odor molecules bind to olfactory
receptors initiating signal- transduction pathways that conduct the signal to the brain
the condition that causes a
person to lose their sense of smell
What allows you to have a sense of taste?
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