Each lung is separated into lobes branching off the main bronchus; the right lung has three lobes, while the left has only two lobes. As the bronchi branch out, the total area of the two new branches is larger than its parent bronchus, making it extremely easy for the air to rush into the lungs.

Excretion in Humans

Excretion is the process where all the metabolic wastes are removed from the body. Excretion in humans is carried through different body parts and internal organs in a series of processes.

The parotid gland is a bilateral salivary gland located in the face.

It produces serous saliva – a watery solution rich in enzymes – which is then secreted into the oral cavity, where it lubricates and aids in the breakdown of food.

he right lung consists of three lobes: the right upper lobe (RUL), the right middle lobe (RML), and the right lower lobe (RLL). The left lung consists of two lobes: the left upper lobe (LUL) and the left lower lobe (LLL).

Human excretory system includes organs that facilitate the removal of nitrogenous wastes from the body. The main excretory organs include kidney, ureter, urinary bladder and urethra. Kidneys filter the blood and urine is the filtrate obtained.

Life of every organism depends on certain basic processes. Excretion is one among them. Different organisms follow different modes of excretion. In complex organisms including humans, there is a specialized system for excretion called human excretory system.

lungs make up a large part of your respiratory system, which is the network of organs and tissues that allow you to breathe. You have two lungs, one on each side of your chest, which is also called the thorax. Your thorax is the area of your body between your neck and your abdomen

The lung root on the left is ensheathed by the pulmonary ligament which hangs inferiorly. The relations of the root to landmarks on the surface of the lung is described in the submenu on the mediastinal surface. The left-sided lung root is approximately triangular in shape with the apex pointing posteroinferiorly.

Pathophysiology

The most common causes for meniscal tears are trauma-related injury and degenerative disease (the latter more common in older patients).

In traumatic tears, the mechanism typically involves a young patient who has twisted their knee whilst it is flexed and weight-bearing, with the onset of symptoms following soon after.