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Previous studies have identified over 3, genes that are differentially expressed in male and female skeletal muscle. Here, we review the sex-based differences in skeletal muscle fiber composition, myosin heavy chain expression, contractile function, and the regulation of these physiological differences by thyroid hormone, estrogen, and testosterone. The findings presented lay the basis for the continued work needed to fully understand the skeletal muscle differences between males and females. Cardiac, smooth, and skeletal are the three muscle types in mammals, with skeletal muscle being the most abundant tissue in the human body.
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Tina Cross is a blonde hottie with a body that that is lean and mean. In this episode and photo set, we see how Tina Cross slowly shows off her physique in hopes of tempting and teasing to get cock into her tight cunt. We get to see Tina Cross reveal her well-toned abs and legs and then her arms and breasts.