Which type of contraction requires the muscles to “activate” but have no movement or change in muscles lengA large dome-shaped muscle under the lungs called the diaphragm squeezes downward when you breathe in, making a vacuum that causes a rush of fresh air into your lungs. The opposite happens when you breathe out -- your diaphragm relaxes upward, pushing on your lungs, letting them deflate. th?

to keep it profesional sex is the main way humans reproduce

explanation:

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.

you actually cant delete a question, you can only edit the question to say you do'nt need anymore or just wait 2 weeks and it'll be deleted by/p>