Organs that function as barriers Your skin and mucous membranes are the first line of defense against germs entering from outside the body. They act as a physical barrier with support from the following: Antibacterial substances can kill germs right from the start.
Organs and tissues important to the proper functioning of the immune system include the thymus and bone marrow, lymph nodes and vessels, spleen, and skin.
The acquired immune system, with help from the innate system, makes special proteins (called antibodies) to protect your body from a specific invader. These antibodies are developed by cells called B lymphocytes after the body has been exposed to the invader.
The skeletal system supports and protects the body's internal organs.
The immune system's three lines of defense include physical and chemical barriers, non-specific innate responses, and specific adaptive responses.
The second line of defence is a group of cells, tissues and organs that work together to protect the body. This is the immune system.
The innate immune system is the body's first line of defense against germs entering the body. It responds in the same way to all germs and foreign substances, which is why it is sometimes referred to as the "nonspecific" immune system.
Our bones give our bodies shape, and support and protect our organs and systems.
Anatomy & Function
The brain is arguably the most important organ in the human body. It controls and coordinates actions and reactions, allows us to think and feel, and enables us to have memories and feelings—all the things that make us human.
Some types of white blood cells, called phagocytes (FAH-guh-sytes), chew up invading organisms. Others, called lymphocytes (LIM-fuh-sytes), help the body remember the invaders and destroy them. One type of phagocyte is the neutrophil (NOO-truh-fil), which fights bacteria.
While your heart is a vital organ, the brain (and the nervous system that attaches to the brain) make up the most critical organ system in the human body. The human nervous system is responsible for coordinating every movement and action your body makes.
These are the nervous system and the endocrine (hormone) system. These systems regulate body processes through chemical and electrical signals that pass between cells.
Homeostasis is maintained by the nervous and endocrine systems. Negative feedback is a response to a stimulus that keeps a variable close to a set value.
Innate and adaptive immune system
There are two subsystems within the immune system, known as the innate (non-specific) immune system and the adaptive (specific) immune system. Both of these subsystems are closely linked and work together whenever a germ or harmful substance triggers an immune response.
The main parts of the immune system are: white blood cells. antibodies. complement system.
The key primary lymphoid organs of the immune system are the thymus and bone marrow, and secondary lymphatic tissues such as spleen, tonsils, lymph vessels, lymph nodes, adenoids, and skin and liver.
You can still have a fairly normal life without one of your lungs, a kidney, your spleen, appendix, gall bladder, adenoids, tonsils, plus some of your lymph nodes, the fibula bones from each leg and six of your ribs.
The human body contains five organs that are considered vital for survival. They are the heart, brain, kidneys, liver, and lungs.
The smallest organ is the pineal gland. It is situated centrally in the brain. It is the main site for the secretion of melatonin that controls the internal clock of the body.
Some body systems work together to complete a job. For example, the respiratory and circulatory systems work together to provide the body with oxygen and to rid the body of carbon dioxide. The lungs provide a place where oxygen can reach the blood and carbon dioxide can be removed from it.
The rib cage help protects the organs in the chest, such as the heart and lungs, from damage.
The five vital organs in the human body are the brain, the heart, the lungs, the kidneys, and the liver. Other organs include the gallbladder, the pancreas, and the stomach. Organ systems, such as the nervous system, support these organs.
White blood cells are a part of your immune system that protects your body from infection. These cells circulate through your bloodstream and tissues to respond to injury or illness by attacking any unknown organisms that enter your body.
Skin, tears and mucus are part of the first line of defence in fighting infection. They help to protect us against invading pathogens. You have beneficial bacteria growing on your skin, in your bowel and other places in the body (such as the mouth and the gut) that stop other harmful bacteria from taking over.
(NA-chuh-rul KIH-ler sel) A type of immune cell that has granules (small particles) with enzymes that can kill tumor cells or cells infected with a virus.