Question

Is breathing internal respiration?

Answer 1

Hint: The process of movement of oxygen from the atmosphere to the cells is referred to as respiration. The animals inhale oxygen through their nose and exhale out carbon dioxide into the atmosphere. The respiratory system includes the nose, pharynx, trachea, bronchi, and a pair of lungs.

Complete answer:
Respiration commences with the nose through which the oxygenated air is brought inside the body when it travels through the larynx, pharynx, and trachea. At the end of the trachea, it branches into two bronchi that lead to the lungs. Each bronchus divides into smaller bronchioles. At the end of each bronchiole are air sacs known as the alveoli. These alveoli are the part of the lungs which is the main region for air exchange. The process of respiration includes two processes:
External respiration and Internal respiration.
In external respiration, the pulmonary artery conveys deoxygenated blood into the lungs from the heart, where it branches and ultimately turns into the narrow organization made out of respiratory vessels. Albeit a modest quantity of the oxygen can break down straightforwardly into plasma from the alveoli, a large portion of the oxygen is captured by red blood cells and ties to a protein called hemoglobin. Oxygenated hemoglobin is red, causing the general appearance of dazzling red oxygenated blood, which gets back to the heart through the pulmonary veins. Carbon dioxide is delivered the other way of oxygen, from the blood to the alveoli.
Internal respiration is also known as cellular respiration. It is the mechanism of breaking down glucose in the presence of oxygen to produce ATP, the energy currency of the cell. It involves three cycles:
Glycolysis: the process of breakdown of glucose into pyruvate.
Krebs’ Cycle; the process of conversion of pyruvate into NADH.
Oxidative Phosphorylation: this process produces ATP from NADH and Water from hydrogen ions.
Since breathing refers to the inhalation and exhalation of air in and out the body, it is not internal respiration.

Note:
The site of respiration in animals is the mitochondria of the cell. It is also referred to as the “Powerhouse” of the cell. Mitochondria is a double membrane structure that has an inner membrane and an outer membrane. Mitochondria consist of a protein ATP synthase that produces the ATP inside the mitochondria.