Prac 8 For dummies Flashcards
What gender is this mosquito
Female
What gender is this mosquito?
Female
Light blocking pigments in the ommatidia of Drosophila are red. This suggests that?
They cannot see the colour red and it is instead reflected. They can see colours like blue and green, however.
What is the function of the tapetum lucidium?
It allows animals to see better in areas of low light
What are the genders of these two mosquitoes ?
One on left is male one on right is female
What is the adaption rate and receptive field size of the Pacinian corpuscles?
Rapid-adapting and has a large receptive field
What is the differeence between slow and fst acting in Vertebrate mechanosensors?
Slow adapting: Continue responding for as long as stimulus is present
Rapid-adapting: Single response when stimulus is first applied.
What are receptive fields? What determines thei size?
Receptive fields are regions in which stimuli can influence electrical activity in sensory receptors. Tand to be larger the deeper the receptor is.
Give a description of the Pacinian corpuscles(include receptive field, adapion rate, what it detects and two point discrimination ability)
Rapid-adapting receptors that detect gross pressure changes and vibrations in the skin respond when the skin is rapidly indented but not when the pressure is steady. Pacinian corpuscles are located deeper in the skin layers os therefore have larger receptive fields, this means the two-point discrimination of the Pacinian corpuscles is poor.
Trichoid sensilla description?
Hairs set in flexible sockets connected to a short dendrite
Trichoid sensilla Function
Pressure or vibration will move the hair causing the movement to be registered by the dendrite.
Trichoid sensilla Purpose?
Trichoid sensilla are mechanosensory that can also act as olfactory sensors and gravity receptors.
Which is typically more centralised Olfaction or Gustation?
Olfaction as is typically centalised around the nose while gustation is spread across tongue and some areas of the mouth.
Compare gustation and olfactions range, molecules required for activation and differention capabilities?
Olfaction
Long range bear’s sense of smell can work as far out as 28km
Requires a large number molecules to produce sensation
high ablitiy to differentiate Mammals can differentiate ~10,000 different odours
Gustation
Short Range: relies on contact
Requires very few molecules to produce sensation
low differentiation can only differentiate five different tastes and can detect 5 different tastes:Salty, Sour, Bitter, Sweet and Umami!
Gustation chemoreceptors key fetures
Less sensitive can only detect five different tastes and can detect 5 different tastes:Salty, Sour, Bitter, Sweet and Umami!
Each receptor can only detect one taste
Uses Epithelial receptor cells rather than neurons used for olfactions and in other senses.
Requires very few molecules to produce sensation
What is the Name of each of the numbered sturctures
- Cochlea
- Tympanic membrane
- Malleus
- Incus
- Stapes
What is the Name of each of the numbered sturctures and their function?
1.Malleus: attached to tympanic membrane trnasmits sound to Incus
2.Pinna:Collects sound waves and helps move them into the ear canal
3.Temporal bone: bone protects nerves and structures in the ear that control hearing and balance
4.Tragus: directs sounds into the ear
5.Exerna; auditory canal: Acts as an entry way for sound waves. Propels them to the ear drum.
- Stapes: transmits sounds from the incus to the Cochlea
7. Incus: transmits ounds from the Malleus to the Stapes
