Textbook Questions Flashcards
(26 cards)
what are insects considered in terms of temperature regulation
poikilothermic/cold blooded
what is poikilothermic
body temperature rises and falls depending on the temperature of the environment
does flying impact the temperature of an insect
yes, the movement of thoracic muscles during flight increases insect body temperature to temps above the environment
where are sensory organs usually located
on the body wall
insects have sense organs receptive to:
chemical, mechanical, auditory, visual stimuli, potentially relative humidity and temperature stimuli
chemoreceptors are involved in
taste (gustation) and smell (olfaction)
what are the purposes of chemical signals
mating, food finding, habitat selection, parasite-host relationships
where are taste organs located
mostly around the mouthparts but sometimes on antenna and tarsi
mechanical stimuli react to:
touch, pressure, vibration
what are the purposes of mechanical signals
orientation, feeding, flight from enemies, general movements, reproduction
what are the 3 principle types of mechanical sense organs
- hair sensilla
- campaniform sensilla
- scolopophorous organs
what is the simplest type of mechanical tactile receptor
hair sensillium
how do hair sensillum respond to stimuli from the environment
a process from the sensory neuron extends to the base of the seta, and movements of the seta initiate impulses of the neuron
how do companiform sensillum respond to stimuli from the environment
neuron ending lies just under a dome-like area of the cuticle, distortion of this dome elicits a neuronal response
how do scolopophorous organs respond to stimuli from the environment
consists of a bundle of sensory neurons whose dendrites are attached to the body wall and are sensitive to movements of the body
what is the johnstons organ
located in the second antennal segment, it is sensitive to antennal movement
the sense of touch in insects is mainly operated through
hair sensilla
what are tympanal organs
scolopophorous organs in which sensory cells are attached to (or very near to) tympanic membranes
where are spiracles generally located
in the pleuron
where are genitalia generally located
on abdominal segment 8 and 9
what are pregenital segments
- segments 1-7
- have no appendages on winged insects
what are cerci
- typically sensory organs
- sometimes adapted to become defense structures
what is the purpose of malpighian tubules
removing nitrogenous waste and working with the hidgut to regulate and balance the water and salt in hemolymph
what is the principle nitrogenous waste
uric acid
