Statocyst: Cells that detect gravity and motion (invertebrates) - Utricle: Detects horizontal motion (vertebrates) - Saccule: Detects vertical motion (vertebrates)
- Semicircular canals: Detect angular motion Chemoreceptors - Taste o Gustation (5 categories) Sweet, Sour, Bitter, Salty, and umami o Taste buds o Na+ (salt), H+ (pH), directly depolarize receptor o G protein coupled receptors - Smell (Olfaction) o Olfaction and taste use a common nerve pathway o Found in the nasal mucosa o Nasal passages o Dendrites o Cerebral cortex - pH o Peripheral chemoreceptors Located in aorta and carotid bodies Monitor blood pH o Central chemoreceptors Located in medulla oblongata Monitor cerebrospinal fluid pH o Increased CO2 in blood lowers pH o When low pH sensed, breathing rate is increased Photoreceptors - Vision o Eye spots Retina - Layer 1= rods + cones - Layer 2= bipolar cells - Layer 3 = ganglion cells Uncommon Senses - Snakes: infrared wavelengths (radiant heat) - Some fish: electrical currents - Various organisms: magnetic fields
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- Fall '19