Last week, we learned about muscle stimulation and the neuromuscular junction. We also learned how multiple consecutive stimuli over the neuromuscular junction activate certain motor units and shorten muscles to cause a contraction (refer to your textbook Links to an external site. for a review or here for a modular review)
This Week's Goals
The fact that our muscles can adapt to stimuli that allow us to dance, shake, workout, run, and play is phenomenal! If we didn’t have this mechanism, we’d never be able to move our bodies or lift any amount of weight. But what exactly is happening at a cellular level that causes our muscles to power contractions when we make efforts to move our bodies? This week, we are going to take muscle stimulation one step further by digging deeper into the role of energy and contractile proteins (actin and myosin) that mechanically aid in muscle contraction.
Woman weightlifting
More specifically, we will seek to...
Explore the mechanisms involved in sliding filament model, the cross-bridge cycle, and ATP
Apply muscle fatigue to homeostatic perturbations involved in exercise overload
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