The muscles are called arrector pili and they pull the hair upright for both of those reasons and a few others.. let me know if you want to know more :)
Erector muscles.
Or Pili erector muscles.
arector pilli
Erector muscles
arrector pili
Piloerector muscles
Arrector pili
400 to 500.
it's called the diaphragm! but technically it expands your muscles so your lungs can expand, it doesn't expand the ribcage.
all of them, muscles can only contract and relax
Your hamstring muscles.
You are using your thiegh and leg muscles
there are about 16 muscles used .
The intercostal muscles, (muscles between the ribs), contract.
Skeletal Muscles
two molecules are formed, each with the original "upright"
during talking,eating,and drinking our face muscles will move