Name: Section #-/Group # Biology 142-Spring 2018 Homework Set 8-Sensory Systems

Question

Name: Section #-/Group # Biology 142-Spring 2018 Homework Set 8-Sensory Systems (10 points) 1. (1 pt.) Why is sensory adaptation to repeated stimuli important for animals? 2(1 pt.) A neuron may receive multiple stimuli from the same sensory neuron over a very short period of time. The firing rate of the receiving neuron is proportional to the number of signals received from the sensory neuron. Which of the following is this an example of (circle one)? a. Hyperpolarization b. Action potential .Spatial summation d. Temporal summation 3. (1 pt.) Three different cells-A1, A2, and A3-are activated to different extents by sensory input. If lateral inhibition is added to the network below, which pattern of activity is expected in cells B1, B2, B3: (circle one) pattern a, pattern b, or pattern c? 01823 A1 A2 A B2B3B1B2 4. (1 pt) Why would it be advantageous for animalsto have two separate systems of chemical detection (taste and smell)? 5. (1 pt) What type of sensory receptor would be responsible for detecting changes in blood pressure (circle one)? a. Chemoreceptor d. Thermoreceptor b. Mechanoreceptor e. Photoreceptor c. Nociceptor

Explanation / Answer

1. Sensory adaptation to repeated stimuli is important for animals as they require to detect changes occurring in the environment constantly. Based on this vital changes in the environment they respond to external stimuli, thus protecting themselves from harmful things.

2. (d) Temporal summation

5. (b) Mechanoreceptor

6. It becomes more difficult for older people to hear more high-pitched sounds as the ability to hear high pitched frequencies wanes. It happens because of presbycusis which results by the aging of the cells in the ears. The frequency of a sound wave determines pitch.

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