1. alveoli, tiny air sacs within the lungs muscle below the lungs used for, 2. bronchi, breathing the two tubes into which the, 3. diaphragm, trachea divides before entering the lung​

1. Alveoli: tiny air sacs within the lungs.

2. Bronchi: the two tubes into which the trachea divides before entering the lung.

3. Diaphragm: a muscle below the lungs used for breathing.

Explanation:

Living system can be defined as the internal systems of organisms and how materials circulate within organisms.

Some examples of living systems in organisms are respiratory system, nervous system, digestive system, and circulatory system.

Additionally, living systems comprises of the following components; cells, organs, muscle, tissues, blood, etc., which are typically used for carrying out various bodily functions such as respiration, metabolism, digestion, etc.

In Human anatomy, cardiac cycle can be defined as a complete heartbeat of the human heart which comprises of sequential alternating contraction and relaxation of the atria and ventricles, therefore causing blood to flow unidirectionally (one direction) throughout the human body.

1. Alveoli: it comprises tiny air sacs and it's located within the lungs of living organisms.

2. Bronchi: these are the two (2) tubes into which the trachea divides (the right bronchus and the left bronchus) before entering the lung.

3. Diaphragm: it's a muscle located below the lungs and typically used for breathing in all living organisms.

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