Describe in detail three anatomical features unique to humans that adapt them for endurance running.

Sliding Filament Theory
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The sliding filament theory of muscle contraction is probably one of the most difficult physiological concepts to grasp in BIO 141. The purpose of this discussion board is to assist students with their understanding of how skeletal muscle contracts by writing about and discussing the topic.
For the initial post, please explain in your own words your understanding of the sliding filament theory beginning from when the calcium is released from SR until the sarcomere actually shortens. Be use to include all of the protein filaments and their role in the contraction. Also, is there anything that you are having difficulty understanding? If you have questions, ask them.
Your initial post should be at least two paragraphs of five sentences each.

The Evolution of Endurance Running Discussion Board
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Read the article attached and address the following three prompts in a thoughtfully written and detailed post.
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There are multiple anatomical differences, mainly associated with the skeletal and muscular system, between bipedal humans and other primates. Scientists hypothesize that these differences are evolutionary adaptations that resulted in humans being able to run long distances. Read the paper posted and address the following in an essay.
1. Summary of the general ideas presented in the article.
2. Describe in detail three anatomical features unique to humans that adapt them for endurance running. So, describe the specific anatomical feature and how is it thought to be an adaptation for endurance running compared to that of other primates. If you need to use other sources here, that is fine, just list them in the works cited section. No specific format is needed here.
3. Even though we retain these adaptations today, do you think humans in modern society are still adapted for endurance running. Why or why not? Give some thought to this and justify your answer.

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