Sensory system

Question 1

Sensation (perception)

Answer 1

conscious awareness of stimuli received by sensory

receptors.

Question 2

Steps for sensation ?

Answer 2

– Stimuli originating either inside or outside of the body must be detected by sensory receptors and converted into action potentials, which are propagated to the CNS by nerves.
– Within the CNS, nerve tracts convey action potentials to the cerebral cortex and to other areas of the CNS.
– Action potentials reaching the cerebral cortex must be translated so the person can be aware of the stimulus.

Question 3

What are the 2 types of senses ?

Answer 3

general and special senses

Question 4

General senses

Answer 4

distributed over large part of body. Receptor generates an action potential called a generator potential that then travels to the brain. Called primary receptors
It is divided into 2: somatic and visceral senses

Question 5

Somatic

Answer 5

(information about the body and environment): touch, pressure, temperature, proprioception, pain

Question 6

Visceral

Answer 6

(information about internal organs): pain and pressure

Question 7

Special senses

Answer 7

modified neutrons locallized in special sensory organ of the head. (smell,taste,sight,hearing,balance.)
A Specialized receptor produces a receptor potential and the receptor then releases a neurotransmitter that binds to receptors on the membrane of a neuron which then travels to the brain.