The nervous system is the part of the body that transmits signals between different parts of the body. These signals can be both voluntary and involuntary. The nervous system is made up of the brain, spinal cord and nerves.
The digestive system is made up of the oral cavity, pharynx, esophagus, stomach, small intestines, and large intestines. In addition, there are a few organs that food does not actually pass through. They contribute to the digestive process, which include the teeth, tongue, salivary glands, liver, gallbladder, and pancreas. The purpose of this system is to provide energy and nutrients to the body and excrete waste.
Liver / Gallbladder
The liver is an essential organ used for detoxification, protein synthesis, production of bile and hormones, stores glycogen, regulates biochemical reactions, and emulsifies fats. The gallbladder is a small organ that sits beneath the liver where bile is stored before it is released into the small intestine.
The urogenital system is a combination of the reproductive system and the urinary system. The reproductive system is used for procreation, and the urinary system is responsible for the formation and elimination of urine. These systems have common ducts that are used for excretion at different times.
The musculoskeletal system is the system that gives the body the ability to move. This system provides form, support, stability, protection to vital organs, and movement to the body. It is made up of bones, muscles, cartilage, tendons, ligaments, joints, and connective tissues.
The main components of the cardiovascular system are the heart, blood, and blood vessels. This system transports oxygen, nutrients, hormones, and cellular waste throughout the body.
The immune system is what fights infectious organisms and invaders. This system is made up of cells, tissues, and organs that work together to protect the body. The four main components that make up the immune system include the spleen, thymus, bone marrow, and lymph nodes.