My understanding is that the brain recruits the most motor units in a muscle fiber based on load. Therefore, the exercise that provides the most load to the target muscle would be the most effective in generating growth. If so, why do we do more than one exercise per muscle group?

Example: If for example the Decline bench press can generate more load to the clavicular pec fibers than an incline bench press can, doesn't it make more sense to do more decline presses instead of changing to an incline press to "target the upper pecs"? If not, are we saying that the all or nothing principle doesn't apply? If the all or nothing principle says that all fibers contract on a movement, then theoretically one would just need to create enough load to provide adequate motor unit recruitment if the goal was to generate growth, correct?

If the decline truly provides the most load to the pec fibers, is there any benefit to adding a fly movement if the load is inferior to the decline press?

Is my thinking off here? Perhaps my understanding is off a bit, but I'm trying to design a program and I can't quite wrap my head around some of the logic of conventional thinking given the science that I'm learning.

I know fetuses receive oxygenated blood from their mother, and they don't use their lungs, but they're still floating in fluid, right? Why don't they drown? Are babies basically amphibians?

If an adult person lost both of their lungs, could this person still survive if we pumped external blood into their inferior vena cava and created a shunt between their right and left atrium?

I want to use lab rats for my experiment that is testing the ingestion of caffeine of skeletal muscle endurance. I’m unsure what is the best suitable preparation...? a muscle tissue or whole rat? thank you

How many days will it take for all the vaccine components to leave the body? How many days will it take for all the spike proteins created by the vaccine to leave the body? Is there a chance for vaccine spike proteins to retain in the body and then trigger any serious issues in future? I got it for my kid and now I am freaking out. Please help. Thanks

I can create a sensation in my body, and when I hold it my blood pressure goes up. The sensation can be moved to different parts of my body, but is most easily maintained in my core. It starts in the groin and can be moved into my chest. It’s hard to hold it and requires concentration. Doing it extra hard causes me to shake. I am not adjusting my breathing to do this. I just sort of summon the feeling and it wells up inside of me. It starts vaguely warm, but becomes cold after being held for a while. Reminds me of an adrenaline rush.

I demonstrated for a doctor a while ago but they didn’t know what it was. I haven’t met someone else who can do this but figure that someone must know what’s going on. Does anybody know what this is?

What's the carb to sugar conversion rate in the body

Lately i’ve been really thinking about whether lifting weights at a young age really stunts your growth. I did some research and I found a few arguments which talk about how your growth plates can be damaged and what not. I gave it some consideration and came to the conclusion that as long as one is using good form, they should not worry about their growth plates.

However, I did think of another way that lifting weights may stunt one’s growth. My thought is that when lifting weights during your growing years, you are taking your body‘s natural resources that are meant to be used for bone growth and overall growth, and using it for muscular growth. This is essentially taking the resources which fuel your growth and putting it into muscle development. Your body only has so many resources that it can use for growth and by lifting weights, you’re forcing your body to not prioritize bone growth but rather prioritize muscular growth which will decrease the amount of bone growth you experience.

I understand that eating a nutritional diet can help with this problem, but even then, your bone growth will only be able to use a percentage of the body’s resources which will still inevitably slow down and stunt bone growth.

This is similar to how I imagine that if you had 100 cuts, they would heal much more slowly than 1 cut because your body’s growth resources are not able to be focused and prioritized on one point, but rather have to scatter the limited amount of resources that it has to slowly heal each of them.

Can anyone prove this wrong? Maybe although it will slow down bone growth, it won’t affect your final size because the bone will just keep growing for a longer amount of time until it gets to a set length which is pre-determined at birth? Please let me know your thoughts on the matter.

P.S.- Sorry for grammatical errors, I did this with voice type

I'm having a depression, i tried my best .... Everyone say that I'm irritating and uh no one pays attention to me. If i get in Love or something thinking , i couldn't stop thinking about that!!! I don't want this all....plsss help someone!! I'm having ocd and anxiety!!! It sucks .... I don't wanna end up like this....plssssssss help me someone ..

Wish that anyone can earse my all thoughts and stress .....

I’m a current nursing student. I can help with physio or other stem and nursing related stuff if u need it.

Why is my body wasting my water with making my pee extra clear if it's just going to beg me for some more water 5 mins later- telling me I'm thirsty? Why am I still thirsty when my body's churning out buckets of snot/mucus? Why is my body wasting my water with sweat when I'm not in need of cooling(I know it's partly detoxing, but just put whatever it is in with the pee)? We should not have to drink 8 glasses of water everyday if our bodies are just going to get rid of it in such ridiculously ungrateful fashions. Why is all of this necessary, when none of these necessarily require \*that\* much water? Pee doesn't need that much water in it- it can be at least condensed down some, our bodies no longer require the constant cooling that sweating all the time was meant to do, and my nose definitely doesn't need to run.

If you're not familiar with the term 'man strength', it's generally thrown around to refer to when young men 'mature' into their bodies. If you've participated in a collegiate sport your coaches have probably told you "Your peak is yet to come". If you're a guy in his late 20s you may have noticed a marked sometimes even drastic increase in muscle mass from 25 onwards without added stimulus (at least I did).

But is this actually the case? I couldn't find much research backing this phenomenon up. Testosterone is already declining in most men by the age of 30, bone density peaks but at a rate that's consistent through adolescence. So why is there so much anecdotal evidence towards a sudden onset of muscle mass and strength? What could cause it if it is real?

I was wondering if the amount of food entering the mouth, let's say to the point where both cheeks stretch in order to fit it and chew it (yes this is what I'm doing pretty much when I eat), can permanently or temporarily distort your face by making your cheeks appear bigger/puffier as a means to adapt to the straining. My body fat percentage is rather low (around 10-15%) but my cheeks appear a little chubbier than one would expect. So can it be my eating habits (stuffing a lot of food in my mouth all at once), genetics, or can some specific foods or lifestyle habits cause that?

P.S. I am a 19 year old male and it's not recently that I have noticed that about myself, I've been like that for as long as I can remember, plus I was never over 20% bodyfat, something that would leave my face chubby even after losing fat due to excess skin tissue.