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Digestive System
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The digestive system consists of the esophagus, stomach, and the large and small intestines. It also involves the gall bladder and pancreas, which release the enzymes necessary to break down the food.

Respiratory System
The respiratory system is responsible for oxygen exchange. The lungs exchange the carbon dioxide carried in the veins with oxygen from breathing. The respiratory system works directly with the circulatory system.
Circulatory System

The circulatory system contains the heart and the blood vessels that carry oxygen and nutrients to the tissue in the body. The heart is the main workhorse for the circulatory system. It keeps blood pressure in capillaries so tissues receive enough oxygen to keep cells alive.

Skeletal System

The skeletal system works to support your body. Without your skeletal frame, you would be unable to move. Humans are vertebrates, meaning we have bony, articulated (jointed) endoskeletons. An endoskeleton is a frame within the body that offers support as it grows and develops. The skeletal system offers protection, support, blood cell formation, stores minerals and energy and aids movement.

Nervous System

The nervous system is responsible for communication from the brain to the organs. The brain is the central component that sends electrical impulses to every part of the body. Every sensation, movement, and thought is derived and controlled by the nervous system.

Integumentary System

The integumentary system is made up of skin, of which there are several layers and appendages.

The integumentary system's functions include body temperature regulation, sensory perception, biochemical analysis and a barrier against physical harm and disease.
Muscular System

The muscular system is a vast network of muscles and tissues that control the body's movement. All the activities the body performs (i.e., jumping and running) are aided by the contraction and relaxation of the muscles.
Endocrine System
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The endocrine system communicates and coordinates with the nervous system, kidneys, liver, reproductive system, pancreas, gut and fat, according to The Hormone Foundation. It helps to control these systems to maintain energy levels, reproduction, homeostasis (internal balance of systems) and your body’s response to situations such as injury or stress.
Lymphatic System

It is responsible for the removal of interstitial fluid from tissues
it absorbs and transports fatty acids and fats as chyle from the digestive system.
It transports white blood cells to and from the lymph nodes into the bones.
The lymph transports antigen-presenting cells (APCs), such as dendritic cells, to the lymph nodes where an immune response is stimulated.
Reproductive System

The male and female parts of the human reproductive system can bring together an egg and a sperm so that they join and begin the development of a new human being. The female system also protects and nourishes the developing foetus during the nine months of pregnancy. About 150,000 eggs are present in a girl’s ovaries at birth; however, sperm production in boys begins only at the start of puberty.

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