Question

What would happen in the respiratory system if there was no diaphragm? Why is the diaphragm so important in breathing?

Answer 1

The Human Respiratory System (HRS) is a system of organs and tissues that allows us to breathe. The primary function of this system is to provide oxygen to the body while also removing carbon dioxide. The human respiratory system is made up of a collection of organs and tissues that aid in breathing. Aside from the lungs, the process of respiration is aided by muscles and a large network of blood vessels.

Complete answer:
The thoracic diaphragm, or simply the diaphragm, is a sheet of internal skeletal muscle that runs across the bottom of the thoracic cavity in humans and other mammals. The diaphragm is the most important respiratory muscle, separating the thoracic cavity (which contains the heart and lungs) from the abdominal cavity: when the diaphragm contracts, the volume of the thoracic cavity increases, creating a negative pressure in the cavity, which draws air into the lungs. The presence of more mitochondria and capillaries than any other skeletal muscle attests to its high oxygen consumption.
The term "diaphragm" in anatomy, coined by Gerard of Cremona, can refer to a variety of flat structures, including the urogenital diaphragm and the pelvic diaphragm, but "the diaphragm" is most commonly used to refer to the thoracic diaphragm. Because the large liver rests beneath the right half of the diaphragm in humans, the diaphragm is slightly asymmetric—its right half is higher up (superior) than the left half. There's also a theory that the presence of the heart causes the diaphragm to be lower on the other side.
Other mammals have diaphragms, and other vertebrates with diaphragm-like structures, such as amphibians and reptiles, but important details of the anatomy, such as the position of the lungs in the thoraxes, may differ.
Thus, The diaphragm is pulled down and returned to its original position during inhalation and exhalation, respectively. When the diaphragm is pulled down, the volume of the chest cavity expands, as does the volume of the lungs, allowing air to pass through. When the diaphragm returns to its original position, the volume of the chest cavity decreases, causing the air pressure in the lungs to rise, causing the air to escape. As a result, the diaphragm is extremely important.

Note:
Coughing, sneezing, vomiting, crying, and expelling feces, urine, and, in parturition, the fetus are all actions that require the diaphragm. Many structures pierce the diaphragm, including the esophagus, aorta, and inferior vena cava, and it is occasionally herniated (rupture).