Pulmonary surfactant is a surface active material composed of lipids and proteins which is found in the fluid lining the alveoli.
Surfactant prevents alveolar collapse. In addition, it is involved in the protection of the lungs from injuries and infections caused by inhaled particles and micro-organisms.
The digestive system protects itself from digestion through several mechanisms. It produces mucus that forms a protective barrier on the lining of the stomach and intestines. Additionally, cells in the digestive system have specialized proteins that help in recognizing and targeting harmful substances while leaving the healthy tissues unharmed. There is also a balance of digestive enzymes and inhibitors that regulate the digestive process to prevent self-digestion.
The endoderm layer of embryonic tissue forms the lining of the digestive tract. It gives rise to the epithelial cells that make up the inner lining of the gastrointestinal system.
The epithelial lining of the gastrointestinal tract is called the mucosa. It is composed of specialized cells that help with absorption, secretion, and protection within the digestive system.
The lining of the entire digestive tract is called the mucosa. It makes what we call mucous.
Ectoderm: Skin, nervous system (brain and spinal cord), and hair. Mesoderm: Bones, muscles, circulatory system (heart and blood vessels), and kidneys. Endoderm: Lining of the digestive tract, respiratory system (lungs), and liver.
the aveoli
threw the aveoli
aveoli
Alveoli are the smallest functional units of the lungs. Therefore, they belong to the respiratory system.
The excretory system removes waste metabolic substances from the boby. They include the skin, kidney(nephron), large intestines, lungs(aveoli)
Mucus
Pulmonary surfactant is a surface active material composed of lipids and proteins which is found in the fluid lining the alveoli.Surfactant prevents alveolar collapse. In addition, it is involved in the protection of the lungs from injuries and infections caused by inhaled particles and micro-organisms.
Endothelial
The digestive system protects itself from digestion through several mechanisms. It produces mucus that forms a protective barrier on the lining of the stomach and intestines. Additionally, cells in the digestive system have specialized proteins that help in recognizing and targeting harmful substances while leaving the healthy tissues unharmed. There is also a balance of digestive enzymes and inhibitors that regulate the digestive process to prevent self-digestion.
The endometrium is the lining of the uterus.
The lining of the uterus
In the lining of the trachea, bronchi, and bronchioles.