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The reproductive system of an organism, also known as the genital system, is the biological system made up of all the anatomical organs involved in sexual reproduction. Many non-living substances such as fluids, hormones, and pheromones are also important accessories to the reproductive system.

Three of the most important features of the reproductive system are to produce egg and sperm cells, to transport and sustain these cells, to nurture the developing fetus, and to produce hormones.

The reproductive system interacts with the endocrine system. The major function of the reproductive system is to ensure survival of the species. Other systems in the body, such as the endocrine and urinary systems, work continuously to maintain homeostasis for survival of the individual.

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The immune system is what protects your body from diseases and infections.

Three of the most important features of the immune system are white blood cells, antibodies, and complement system.

The immune system interacts with the nervous system. It maintains extensive communication, including 'hardwiring' of sympathetic and parasympathetic nerves to lymphoid organs.

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The nervous system includes the brain, spinal cord, and a complex network of nerves. This system sends messages back and forth between the brain and the body. The brain is what controls all the body's functions. The spinal cord runs from the brain down through the back.

The main features in the nervous system are the central nervous system that is made up of the brain and spinal cord and the peripheral nervous system that is made up of nerves that branch off from the spinal cord and extend to all parts of the body.

The nervous system interacts with the digestive system. The nervous system controls the digestive system by sending signals to the brain and organs.

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Your musculoskeletal system includes your bones, cartilage, ligaments, tendons, and connective tissues. Your skeleton provides a framework for your muscles and other soft tissues. Together, they support your body's weight, maintain your posture and help you move.

Three of the most important features in the musculoskeletal system are that it provides form, support, stability and movement to the body.

Your musculoskeletal system interacts with the nervous system (brain and nerves) sends a message to activate your skeletal (voluntary) muscles.

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The endocrine system is a network of glands that produce and release hormones that help control many body functions, including the body's ability to change calories into energy that powers cells and organs. The endocrine system influences how your heart beats, how your bones and tissues grow, even your ability to make a baby. It plays a vital role in whether or not you develop diabetes, thyroid disease, growth disorders, sexual dysfunction, and a host of other hormone-related disorders.

Three of the most important features of the endocrine system are hormones that are intended to keep homeostasis, influence metabolism, regulate growth, controls sexual sexual reproduction, and responsible for nourishment of the baby.

The endocrine interacts with the nervous system. The endocrine system works well with the nervous system and the immune system to help the body cope with different events and stresses.

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The respiratory system consists of the set of organs and tissues involved in the uptake of oxygen from the atmosphere and the release of carbon dioxide generated during aerobic respiration. This gas exchange is also called breathing or external respiration.

The three most important features for the respiratory system are the airway, the lungs, and the muscles of respiration. All respiratory organs have large surface area to transport/exchange enough oxygen, all the respiratory organs have thin walls for easy diffusion and exchange of respiratory gases, all the respiratory organs such as skin, gills, and lungs, have a rich blood supply for transporting respiratory gases.

The respiratory interacts with the circulatory system. The respiratory system works closely with the circulatory system for the transfer and transport of oxygen and carbon dioxide molecules.

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The circulatory system transports oxygen an nutrients to all corners of the body. It also carries away carbon dioxide and other waste products.

Three of the main features of the circulatory system are transport of oxygen, carbon dioxide and nutrients.

The circulatory interacts with the respiratory system. The respiratory system relies on your circulatory system to deliver oxygen it gathers, while the muscles of your heart cannot function without the oxygen they receive from your lungs.

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The digestive system converts the foods we eat into their simplest forms, like glucose (sugars), amino acids (that make up protein) or fatty acids (that make up fats). The broken-down food is then absorbed into the bloodstream from the small intestine and the nutrients are carried to each cell in the body.

Three of the most important features of the digestive system is the mouth, stomach, small intestine, and the large intestine.

The digestive system interacts with the endocrine system because they both use the pancreas.