Lecture 25 Flashcards
What does sensation allow organisms to do?
It allows organisms to react to stimuli.
What are the steps of sensation in animals?
Reception-Transduction-Transmission-Perception. RTTP
Define Sensory Receptors
They are either neurons or attached to neurons.
What are the 5 classes of sensory receptors?
Mechanoreceptors-Chemoreceptors-Electromagnetic Receptors-Thermoreceptors-Nociceptors MCET-N
What do mechanoreceptors do?
Touch, vibration, audition (noise)
What do chemoreceptors do?
Osmolarity, taste, smell
What do electromagnetic receptors do?
Electrical current, light (vision)
What do thermoreceptors do?
Hot,cold
What do nociceptors do?
PaIN
Define Perception
A neural representation of the world.
What is the oldest sense?
Olfaction
Define Olfaction
The long-range detection of fluid-borne molecules.
What are some of the structures involved in olfaction?
Nares-Antennae-Olfactory Epithelium-Tentacles
In terms of movement from structure to structure, how does olfaction happen?
Olfactory receptor cells to nasal epithelium to bone to olfactory bulb to brain.
Define Odors
Mixtures of chemicals called odorants.
What are the steps that happen in olfaction?
1) Olfactory receptor cells express olfactory receptors that bind to odorants. Each olfactory cell only expresses one type of olfactory receptor.
2) Odorants bind to olfactory receptors, triggering action potentials in olfactory receptor cells.
How is odor intensity encoded?
Based on how many olfactory cells were stimulated.