In experiment 3, why did the room temperature water feel warm when your finger w
ID: 52354 • Letter: I
Question
In experiment 3, why did the room temperature water feel warm when your finger was cold and then it felt cold when your finger was warm?
thermoreceptors can only detect slight temperature differences
thermoreceptors do not register temperature, merely heat flow
the thermoreceptors in your finger are not very accurate, as they are not critical to the function of the body
thermoreceptors are only good at detecting painful (or potentially harmful) temperatures and therefore are not accurate for room temperature
4)
Which of the following is not categorized as connective tissue?
blood
bone
adipose
skeletal muscle
all of the above are examples of connective tissue
3) Based on the scientific name Streptococcus agalactiae, which morphology would you expect these cells to have?
spiral shaped
oval
spherical
triangular
4) You have designed a new antibiotic that destroys cell membranes. Why might this be problematic?
bacterial cells do not have cell membranes
all cells have cell membranes
cell membranes are not necessary for bacteria to cause infection
cell membranes are only found in plant cells
thermoreceptors can only detect slight temperature differences
thermoreceptors do not register temperature, merely heat flow
the thermoreceptors in your finger are not very accurate, as they are not critical to the function of the body
thermoreceptors are only good at detecting painful (or potentially harmful) temperatures and therefore are not accurate for room temperature
Procedure You will need a laboratory partner to perform the first part (1-3) of this lab. 1. Seat yourself and close your eyes. 2. Have your partner hold the points of a hairpin at the forearm, back of the neck, index finger, and the back of the hand. 3. Start with the hairpin opened up all the way, so the points are about one-inch apart. Bring the two points closer together until you are no longer able to discriminate two points. 4. Measure the distance between the points when only one point is sensed. Forearm Back of neck: Index finger: Back of hand: 5. Obtain three beakers. Fill beaker one with ice water, beaker two with room temperature water, and beaker three with warm water. Immerse your left pointer finger in the ice water, and your right pointer finger in the warm water for 30 seconds. 6. First, place the hand that was in the ice water into the beaker filled with room temperature water. Note the sensation (did it feel cooler or warmer?) 26: Animal Sensory & Nervous Systems 7. Next, place the hand that was in the warm water into the room temperature water. Again, note the sensationExplanation / Answer
Thermoreceptors are sensory receptors that code absolute and relative changes in temperature. They are the receptive portion of a sensory neuron. We feel the room temperature water warm when our fingers are cold and the same will be felt cold when our fingers are warm.
Heat receptors are closer to the skin's surface, while cold receptors are found deeper in the dermis. This shows that sensitivity to hot temperatures will be higher than lower temperatures based on the location of the receptors.
Thus, thermoreceptors can detect even slight temperature differences. They not only detect a temperature change, but also can detect a newly created heat flow.
2) Skeletal muscle is not categorized as connective tissue.
3) Based on the name Streptococcus, we expect these cells to be spherical.
4) The antibiotic that destroys cell membranes is problematic as all cell have cell membranes. Thus, it can act even on host cells that are infected with the bacteria.