The integumentary system consists of the skin and its accessory organs.

The endocrine system is a communication system.

The nervous system has two major parts.

The digestive system is a group of organs that work together.

The respiratory tract consists of the upper respiratory tract and the lower respiratory tract.

The cardiovascular system is made up of the heart and circulatory system.

The urinary system is consists of two kidneys, two ureters, a urinary bladder and a urethra.

The reproductive system ensures the continuation of the species.

The lymphatic system helps to provide vital protection from infectious diseases.

Humans are vertebrates—animals having a vertebral column or backbone.