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diaphragm

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Secondary Information

Definition

In biology, a diaphragm is a muscular partition that separates the chest from the abdomen. It is a dome-shaped muscle that contracts and relaxes to help with breathing. When the diaphragm contracts, it flattens and creates a vacuum in the chest cavity. This vacuum pulls air into the lungs. When the diaphragm relaxes, it returns to its dome shape and pushes air out of the lungs.

The diaphragm is an important muscle for breathing. It helps to control the rate and depth of breathing. It also helps to distribute air evenly throughout the lungs.

The diaphragm is also involved in other functions, such as coughing, vomiting, and childbirth.

How can the word be used?

The muscular partition that separates the chest from the abdomen.

diaphragm

Different forms of the word

Noun: diaphragm.

Synonym: midriff.

Etymology

The word "diaphragm" comes from the Greek word diaphragma, which means "partition" or "wall". It was first used in English in the 14th century to refer to the muscular partition that separates the chest from the abdomen.

Question

What is a diaphragm?

AQA Science Exam Question and Answer

Question:

Describe the structure and function of the diaphragm in the human respiratory system, and explain its role in the process of breathing.

Answer:

The diaphragm is a vital muscle located at the base of the thoracic cavity, separating the chest and abdominal cavities. It has a dome-like shape and plays a crucial role in the process of breathing, specifically during inhalation and exhalation. During inhalation, the diaphragm contracts and moves downwards, causing the volume of the thoracic cavity to increase. This movement creates a negative pressure within the lungs, allowing air to be drawn in from the atmosphere to equalise the pressure.

Conversely, during exhalation, the diaphragm relaxes and moves upwards, reducing the volume of the thoracic cavity. This decrease in volume increases the pressure within the lungs, forcing the air to be expelled. The diaphragm's rhythmic contractions and relaxations ensure a continuous flow of oxygen-rich air into the lungs and the removal of carbon dioxide, enabling efficient gas exchange and sustaining the body's respiratory needs.