BIOL 370 Paper 2 Niu et al

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Arizona State University *

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Biology

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Dec 6, 2023

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Biology 370 Principles of Muscle Physiology & Energetics Paper Discussion 2 Worksheet Participant Names (max 5): Niu A, Li M, Pu P, Wang H, Zhang T, Tang X & Chen Q. 2021. Effects of temperature on the locomotor performance and contraction properties of skeletal muscle from two Phrynocephalus lizards at high and low altitude. Journal of Comparative Physiology B 191: 907–916. In preparation for class, please read the above referenced paper, which can be found in the “paper” file on Canvas. Download this worksheet for lecture and it can be filled out using a word processor. Paper copies will also be supplied. Due Date: completed worksheet is due on October 17 th , 2023 at 8 p.m. on Canvas Question 1. (4 marks) a) What are the physiological challenges associated with inhabiting a high-altitude environment? (2 marks) b) Why do you think it is interesting and important to examine muscle function in animals that live under these conditions (ie what can we learn by studying animals that live at high-altitude)? (1 mark) c) Why is it important to include a species that lives in a more typical environment when studying one that lives in an extreme environment like high-altitude? ( 1 mark) Question 2. (3 marks) In the in vivo running experiments, what might be the impact of acclimating (ie exposing them for several weeks) the animals to the test temperatures on the measurements rather than the short-term acute temperature changes? (1mark) a) In the sprint speed experiments, provide a physiological rationale for why sprint speed increases between body temperatures of 21 and 30°C. (1mark) 1 Name of the person who is responsible for submitting should be in bold
b) Why do you think sprint speeds plateau in each species at temperatures above 30°C? (1mark) Question 3. (1mark) Describe why is it important to normalize measurements of tension and shortening velocity to the cross-sectional area of the muscle. Question 4. (5marks)- Fill out the following table using brief point form responses for how the two species differ in attributes listed under measurements. (0.5 marks / box) Measurement P. erythrurus P. przewalskii Native environment Morphology Sprint speed P t V max Question 5. (1mark) Provide an explanation for why P t declines in both species at 45°C compared with the other test temperatures? 2
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