Lab 3 Flashcards
Mechanoreceptor
are specialized sensory nerve cells that respond to touch, pressure, sound, movement and stretch. They an detect internal and external stimuli.
proprioreceptors or Internal Machanoreceptors
Function to provide info about muscle position, contraction, movement as well as leg positioning in space.
Cockroaches have a number of mechnorecpetors of the cuticle or exoskeleton of their legs: Include:
- ) Short hairs called setae
- ) Cluster of hairs called hair plates which bend when adjoining surfaces of the cuticle contact each other in movement.
- ) Dome-like structures called Campaniform Sensilla, are distorted with the moevment of the sensilla or with the movements of the leg.
- ) Structures under the cuticle called chordotonal organs which change in length when the joint that the organ spans is extended or flexed.
Where are action potentials easily recorded?
In the cockroaches femure, because that is where the large sensory nerve passes through.
Stretch Receptors are…
(Such as chordotonal organs) are used to detetcedthe position of the leg as the cockroach moves.
Sensory Receptor Adaptation
If a stimulus is prolonged in duration the sensory receptor firing rate will decling over time, sensory receptors generally have different speeds of sensort receptor adapatation (paper on the back of the hands example)
pucinian corpuscles
in human skin have a very fast sensory receptor adaptation (clothes)
2 major sources of electrical noise:
- ) Pickup
2. ) Ground looops
Pickup electrical noise:
Can be reduced by a faraday cage, separates the source of the radiation from the electrodes. is caused by electrical radiation that produces currents in the electrodes and wires leading to the amplifiers in the recording system.
Ground Loops
Caused by ground cable itself serving as an antennae for all the noise in the room. Use cables to connect each device directly to the common grounding point.
What is the hind leg of the cockroach called?
Methathoraxic leg
What is the Coxa
is the upper portion of the lef which attaches the leg to the thorax
What is the Trochanter
acts like a knee and lets the roach bend its leg.
The femur and the tibia, what do they resemble?
resemble thing and shin bones
Tarsus acts like a….
ankle and foot