From sleeping because sleeping gives us energy
The protein that acts as a calcium receptor in skeletal
muscle is troponin. roponin, or the troponin complex, is a complex of
three regulatory proteins (troponin C, <span>troponin I</span>,
and troponin T)
that is integral to muscle contraction[2] in skeletal
muscle and cardiac
muscle, but not smooth muscle .
Answer: The Digestive System
Explanation: Polio first enters the body through the mouth, usually through contact between people. The infected person can spread it through their nasal and oral secretions (mucous and saliva) as well as through their infected contaminated fecal matter (stool from bowel movement), in cases of lack of hygiene. Once the polio virus is in the digestive tract, it multiplies quickly, then enters the blood, and ends up in the nervous system. From there, it attacks the spine leading to paralysis.
