Sensory function Flashcards
Two sensory receptors
Somatic
Special
Types of somatic senses
Touch, Pressure, pain, temperature, stetch, vibration
What are special senses
Vision, hearing, taste, olfaction, equilibrium
5 types of receptors
Chemoreceptors Nociceptors Thermoreceptors Mechanoreceptors Photoreceptors
What is sensation
The proces of receiving, converting and transmitting information from the external and internal environment tp the brain
What is perception
The process of selecting, organising and interpreting raw sensory data into mental representations of the world
What is absolute threshold
The smallest detectable level of stimulation that is needed to detect a particular stimulus 50% of the time
WHat is difference threshold
The smallest change in the amount of stimlus required for someone to notice that change 50% of the time
WHat are exterorecptors
Located at surface of the body
relays info about external environment
What are interoceptors
Located in the walls of the organs, blood vessels and msucles
Relays onfo about internal envirnment - most not consiously received
What are proprioceptor
Located in the muslces, tendons and joints
Respond to changes in body position, muscle lenght, tensions, equilibrium and joints
How is intensity of stimulus controlled
Controlled by number of receptors activated and the frequency of the action potentials generated by the receptors
How is duration of stimulus controlled
COntrolled by the frequncy of receptor activation
Characteristics of mechanoreceptors
Unencapsulated/encapsulated dendritic endings
Found in skin and deep organs
4 types of tactile mechanoreceptors
Merkel’s disks
Meissner’s corpuscles
Ruffini endings
Pacinian corpuslces
