Body Systems

A closer look into your body


Your body has 11 body systems including the circulatory, digestive, endocrine, immune, lymphatic, muscular, nervous, reproductive, respiratory, skeletal, and urinary. These 11 systems work together everyday to keep alive and healthy. Let's take a look at what is really going on inside of you.

Circulatory System

The circulatory system is the body system that brings blood to the body. The heart and all blood vessels make up the circulatory system. Blood vessels that take blood away from the heart are arteries. Arteries get smaller as they go away from the heart. When arteries get very small, they are called arterioles. Blood vessels that take blood towards the heart are veins. Veins get bigger as they go toward the heart. The smallest veins are called venules. Capillaries go between arteries and veins.

The circulatory system is responsible for transporting materials throughout the entire body. It transports nutrients, water, and oxygen to your billions of body cells and carries away wastes such as carbon dioxide that body cells produce.It is an amazing highway that travels through your entire body connecting all your body cells.

Digestive system

The body system that eats and digests food breaking down food into simple chemicals that can be absorbed by other parts of the body so the chemicals can be used for energy and building the body, it also gets rid of waste after digestion.

The human digestive system is a series of organs that converts food into essential nutrients that are absorbed into the body and moves the unused waste material out of the body. It is essential to good health because if the digestive system shuts down, the body cannot be nourished or rid itself of waste.

Endocrine System

The endocrine system includes those organs of the body which produce hormones. It helps to regulate metabolism, growth and development, tissue function, and plays a part also in mood.

The endocrine system influences almost every cell, organ, and function of our bodies. The endocrine system is instrumental in regulating mood, growth and development, tissue function, metabolism, and sexual function and reproductive processes.

Immune System

The immune system is the set of tissues which work together to resist infections. The immune mechanisms help an organism identify a pathogen, and neutralize its threat. The immune system can detect and identify many different kinds of disease agents. Examples are viruses, bacteria and parasites. The immune system can detect a difference between the body's own healthy cells or tissues, and 'foreign' cells. Detecting an unhealthy intruder is complicated, because intruders can evolve and adapt so that the immune system will no longer detect them.

The purpose of the immune system is to keep infectious microorganisms, such as certain bacteria, viruses, and fungi, out of the body, and to destroy any infectious microorganisms that do invade the body. The immune system is made up of a complex and vital network of cells and organs that protect the body from infection.

Lymphatic System

In mammals, the lymphatic system is a network of thin vessels that branch, like blood vessels, into tissues throughout the body. It is part of the immune system. It is a one-way system which carries cells and fluid back to the blood system. Lymphatic vessels carry lymph, a colorless, watery fluid and white blood cells. It comes from interstitial fluid in the tissues which is squeezed out of the blood vessels. The lymphatic system transports infection-fighting cells called lymphocytes, and is involved in the removal of foreign matter and cell debris by phagocytes. A second function is to transport fats from the small intestine to the blood.

The lymphatic system, which is a subset of the circulatory system, has a number of functions, including the removal of interstitial fluid, the extracellular fluid that bathes most tissue. It also acts as a highway, transporting white blood cells to and from the lymph nodes into the bones, and antigen-presenting cells to the lymph nodes.

Muscular System

The nervous system controls the actions of the muscles, although some muscles, including the cardiac muscle, can function autonomously. Muscles make up more than half of the weight of the human body. The muscular system can be broken down into three types of muscles: skeletal, smooth and cardiac.

The muscular system is one of the major systems of human and animal bodies. Its main purpose is to produce movement, which it does since it is connected to the skeletal system by tendons.

Nervous System

The nervous system is a system in the body which sends signals around the body. It lets people and animals respond to what is around them. The central nervous system is the brain, the spinal cord, and nerves. It is present in most animals. It is there to coordinate movement, to process the input of the senses, and to make the animals act a certain way.

Reproductive System

The reproductive system is a collection of organs that work together for the purpose of producing a new life. Scientists argue that the reproductive system is among the most important systems in the entire body. Without the ability to reproduce, a species dies.

The major organs of the reproductive system include the external genitalia and internal organs, including gonads that produce gamete, which is a cell that fuses with another cell during conception in organisms that reproduce sexually. Substances such as fluids, hormones, and pheromones are also important to the effective functioning of the reproductive system.

Respiratory System

The respiratory system, also called the gas exchange system is the body getting rid of carbon dioxide and taking in oxygen. Carbon dioxide, a waste product of cellular respiration is exhaled and oxygen is inhaled. The oxygen then goes into the blood due to a a difference in concentration. The first process of this system is breathing in the air, or inhaling. The second process is gas exchange in the lungs where oxygen from the air is diffused into the blood in exchange for the carbon dioxide. The third process is cellular respiration, where oxygen and glucose in the blood is changed into energy during glycolysis, the Krebs cycle, and the electron transport chain. This produces the high concentration of carbon dioxide found in the blood. Finally, the carbon dioxide from cellular respiration is exhaled out the body from the lungs.

In humans, the average rate of breathing is dependent upon age. Newborns up to 6 weeks take 30 to 60 breaths per minute, while the average resting respiratory rate for adults is 12 to 20 breaths per minute. Physical exertion also has an impact on respiratory rate and healthy adults can average 45 breaths per minute during strenuous exercise.

Skeletal System

The adult human skeletal system consists of 206 bones, as well as a network of tendons, ligaments and cartilage that connects them. The skeletal system performs vital functions: support, movement, protection, blood cell production, calcium storage and endocrine regulation, that enable us to move through our daily lives.

A typical bone has a dense and tough outer layer. Next is a layer of spongy bone, which lighter and slightly flexible. In the middle of some bones is jelly-like bone marrow, where new cells are constantly being produced for blood.

Urinary/Excretory System

The urinary system works with the lungs, skin and intestines to maintain the balance of chemicals and water in the body. Adults eliminate about a quart and a half (1.42 liters) of urine each day, depending on the amount of fluid consumed and fluid lost through perspiring and breathing.

The primary organs of the urinary system are the kidneys, which are bean-shaped organs that are located just below the rib cage in the middle of the back. From the kidneys, urine travels down two thin tubes, called ureters, to the bladder. Muscles in the ureter walls continuously tighten and relax to force urine away from the kidneys. The bladder stores urine until you are ready to empty it. Nerves in the bladder send signals when it needs to be emptied.

That's It, Those Are the Body Systems!

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