What are the organs of respiration?

Answer 1

The organs of respiration are:

Nose, Trachea, Bronchus, Lungs, Alveoli and the Diaphragm (which is the main organ of respiration.)

The Nose encloses a nasal cavity which opens to the outside through two nostrils. Nose has fine hair and a sticky liquid, mucus, both of which serve to filter the air entering the nasal cavity. Nose performs the following functions:

1. Fine hair and mucus present in the nose prevent the entry of dust particles and germs into the respiratory system.

2. Mucus moistens the air in the nasal cavity.

3. Blood circulating in the nose warms the air

From the nasal cavity air passes into the pharynx, a cone-shaped passageway, and into the trachea.

Commonly known as the windpipe, the trachea is a tube about 4 inches long and less than an inch in diameter in most people.It is composed of about 20 rings of tough cartilage. The back part of each ring is made of muscle and connective tissue. The trachea widens and lengthens slightly with each breath in, returning to its resting size with each breath out. The trachea then divides into two smaller tubes called bronchi: one bronchus for each lung.

Bronchi are the main passageway into the lungs..

One of the primary function of bronchi is to allow air to pass through it. As the trachea splits into two parts, the inhaled air then enters the bronchi. From here, it passes through the further divisions of the bronchi, which are known as bronchioles. The bronchioles then divides to form alveolar ducts which eventually end into alveolar air sacs or alveoli. Thus, the bronchi basically act as a passage for air to pass.

The oxygen exchange in the lungs takes place across the membranes of small balloon-like structures called alveoli attached to the branches of the bronchial passages; they are the final branchings of the respiratory tree. These alveoli inflate and deflate with inhalation and exhalation. The gas-blood barrier between the alveolar space and the pulmonary capillaries is extremely thin, allowing for rapid gas exchange. To reach the blood, oxygen must diffuse through the alveolar epithelium, a thin interstitial space, and the capillary endothelium; CO2 follows the reverse course to reach the alveoli.

The air (oxygen) we breathe enters the lungs via the main windpipe (trachea), which branches into two main tubes supplying the right and left lung, respectively. These tubes progressively branch 22 additional times to form more than 100,000 smaller tubes (bronchi, bronchioles) and more than 300 million air sacs (alveoli), which are only about 0.3 mm in diameter.The lungs store the body's oxygen supply and are pumps that push air around and out of the body. They pull in oxygen and absorb the oxygen into the lining of the lungs. Then pushes the oxygen into the chambers of the heart so the oxygen can travel to the rest of the What_is_the_function_of_the_lungs

The diaphragm is a dome-shaped musculo-fibrous septum that separates the thoracic cavity from the rest of the abdominal cavity. Hence, its convex upper surface forms the floor of the thoracic cavity and the concave lower surface forms the roof of the abdominal cavity. When a person inhales, the diaphragm contracts and thus, enlarges the space available in the thoracic cavity. The external intercostal muscles also help bring about this enlargement of the thoracic cavity. This enlargement thus creates a negative pressure which leads to a suction force and drawing of air into the lungs. After inhalation, when the diaphragm relaxes, air is exhaled due to the elastic recoil of the lungs and the tissues lining the thoracic cavity. The abdominal muscles also help in this, by acting as antagonists to the effects of diaphragm.