Vocabulary
These are the dense networks of interwoven nerve fibers and their branches and synapses, usually with brains.
Neuropils
This is the evolutionary trend of concentrating sensory and neural structures towards the anterior end.
cephalization
Name 1 thing that sensory organs help with
movement, feeding, reproduction, and defense
A nocturnal predator navigates through dense forests using only the faintest light. Its brain must process inputs from these organs to hunt efficiently.
Photoreceptors
This is responsible for bringing IN sensory input such as pain, taste, smell, etc.
Afferent Nerves
What was the earliest organism that lacked true nerves?
poriferas
What type of sensory organs are chemoreceptors?
Taste and Smell Organs
As a jellyfish is floating in the ocean and a fish brushes up against it, what type of nervous system springs to action?
Nerve Net
Conducts an impulse from the central processing center to a muscle, where the response occurs.
Efferent Nerves
What are the three steps of how the nervous system works?
Sensory input, Integration, and Motor output
Name the two types of Mechanoreceptors
Tactile Receptors and Proprioceptors
What is the type of sensory organ that is light a light sensing organ?
Photoreceptors
Can detect the Earth's magnetic field for navigation.
Magnetoreceptors
This sort of arrangement of nerve tissue contains radial nerves extending to each body region.
nerve ring
Give an example of a sensory organ in the Annelida Phyla
Photoreceptors or Statoreceptors
Name a type of phylum that is in Mechanoreceptors
Arthropoda (Insects & Spiders)
Mollusca (Snails, Clams, Octopuses)
Cnidaria (Jellyfish, Corals, Sea Anemones)
Detects the limb and body position.
Proprioceptors
Each part of the body “thinks” on its own and acts independently from all other parts of the body.
decentralized nervous system
What is the function of Statoreceptors?
Help invertebrates sense gravity and body position
Do sensory organs in inverts have all 5 sense like a human?
Yes