I also felt really lonely and bored since corona has started. It’s gotten better. But I got a job to keep me busy and make friends there. I also go to my local gym to keep myself busy and make friends. But while you’re at home, you can start texting people on social media that you know but aren’t close with and slowly build a bond with new people. And then call and text them whenever. (If you’re old enough for gym & work, and then if you have a phone or availability to social media) hope this helps.
The human musculoskeletal system is composed of more than 600. It's actually closer to 650 and consists of both smooth and cardiac muscle tissue. I hope this helps!