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  1. The primary function of the _________________ is to supply the blood with oxygen so that the blood can deliver oxygen to all parts of the body. (1 point)

Digestive system

Cardiac system

Respiratory system

Endocrine system

  1. The ___________ is a strong wall of muscle that contracts to create a suction in the chest to draw in air and expand the lungs. When the muscle relaxes, the chest cavity decreases and the air is pushed out. (1 point)

Verified Answer :

Respiratory system

Diaphragm

The principal glands of the respiratory system are lungs, which transport out the interchange of gases as we exhale. Red blood cells accumulate the oxygen from the lungs and transport it to the portions of the body wherever it is required.

The diaphragm is a tiny skeletal tissue that lies at the base of the chest and divides the stomach from the thorax. It compresses and crushes when you inhale. This generates a vacuum impact that stretches air into the lungs. When you breathe, the diaphragm decreases and the oxygen is forced out of lungs.

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