Answer:The sliding filament model of muscle contraction, put forward by Hugh Huxley and Jean Hanson in 1954, is 60 years old in 2014. Formulation of the model and subsequent proof was driven by the pioneering work of Hugh Huxley (1924–2013).
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I believe it's the last two. "makes the lungs able to fill more completely" and "helps the blood vessels dilate more easily" hope this helps, have an amazing day :)
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i feel this way all the time and what i do to help myself out is i do something that makes me feel happy like for example i love drawing so when i feel this way i will go to my room and i will draw something and then show it to my parents or siblings and they give me praise for doing a good job but that might be your case and if it isn't than just do something that makes you happy okay i hope it gets better for you i really do
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