Lungs do not actively expand and contract by themselves. A muscle below the lungs called the diaphragm acts as a bellow, creating negative pressure within the abdominal cavity that holds the lungs to allow air to rush in and out the lungs.
The diaphragm.
It's called the Diaphragm.
The Diaphragm
This is the diaphragm.
A skeletal muscle connects two bones together by the joint and when the muscle contracts it brings the two bones closer together. These skeletal muscles moves the bones.
Centripetal forces bring people together.
muscles contract and relax by bring about movements.
They can transfer forces and bring about changes in the direction of forces
Muscles contain certain proteins called contractile proteins which enable it to contract and relax to bring about movements.
Muscle tissue produces movement.
The coronary arteries feed and bring oxygen to the heart muscle. If that artery is blocked, the muscle will die. It can not fix itself and the damage can be so bad that the muscle will tear and the person will die.If TPA can be give quickly, the clot maybe removed. Some times the problem can be prevented if bypass surgery is preformed on a very narrow artery.
They wanted to expand their empire, and bring in more revenue.
Balanced forces do not bring about any change in motion. If forces are balanced, an object is either at rest, or moving in a straight line at constant velocity.
centrifugal (forces that bring together) and centrifugal (forces that divide)
NO! You signed a contract, you own the car now.
The diaphragm helps bring air into animal lungs.