Question

Describe the machanism of breathing in human

Answer 1

Answer:

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Explanation:

When you breathe in, or inhale, your diaphragm contracts and moves downward. This increases the space in your chest cavity, and your lungs expand into it. The muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.

Answer 2

Answer:

Explanation:

Breathing in / Inspiration / Inhalation:This process of inhalation happens as follows

• The external intercoastal muscles contract while the internal intercoastal muscles relax. This causes the rib cage to move upward and outward.

• At the same time, the diaphram muscles contract pulling down and flattening the domed-shaped-diaphram.
• These actions result to an increase in the volume of the thorax and a decrease in the pressure around the lungs, such that it falls below the external air pressure and air rushes in through the nostrils→trachea→bronchi→bronchioles→alveoli of the lungs.

Breathing out / Expiration / Exhalation: This process of expiration occurs as follows

• The external intercoastal muscles relax while the internal intercoastal muscles contract. This causes the rib cage downward and inward.
• At the same time the diaphram muscles relax causing the diaphram to regain it domed-shaped.

• These actions result to a decrease in the volume of the thorax and an increase in the pressure around the lungs such that it rises above external air pressure and air rushes out through the alveoli of the lungs→bronchioles→bronchi→trachea→nostrils.

note that these actions are very rapid

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