3.3 SENSORY PERCEPTION

Detect specific molecules

Chemoreceptors

Detect chemicals ; damaged cells (pain)

Nociceptors

Solute concentrations in blood plasma

Osmoreceptors

Changes in temperatures

Thermoreceptors

Physical changes of plasma membrane

Mechanoreceptors

3 classes of mechanoreceptors

Touch/pressure: tactile receptors

Pressure: baroreceptors

Limp position: proprioceptors

Pain from organs ; in skin rather than viscera itself (dermatomes)

Referred pain

Sense of taste

Gustation

Sense of smell

Olfaction

Mucous membrane

Conjunctiva

Produces tears

Lacrimal gland

Openings on medial side of eyelids ; tears to drain from eye

Lacrimal puncta

Path through which tears drain into nose

Nasolacrimal canal

3 layers of tunics

Superficial: fibrous tunic

Middle: vascular tunic

Deep: neural tunic

White of eye (dense fibrous connective tissue)

Sclera

Vascular tunic housing ; capillaries to supply retina

Choroid

Anterior ; pigmented adjustable ring ; determines amount of light passing into eye

Iris

Hole in iris

Pupil

Layer of eye ; containing photoreceptors

Retina

Deformable and elastic ; transparent ; bi-convex disc

Lens

Muscles responsible for changing shape of lens

Ciliary muscles

Status of ciliary muscles ; up close

Bi-convex/ contracted

2 spaces in the eye / material that fills each

Posterior cavity / vitreous humor/ body

Anterior cavity / aqueous humor

Anterior to pituitary ; formed by convergence of some tracts of optic nerve

Optic chiasm

Funnel shaped epithelial tissue

Tympanum

Gravitational equilibrium

Vestibule