The Reproductive System contain the sex organs which work together for the purpose of sexual reproduction. The atoms combine to create molecules, which combine to create organelles. The organelles combine to create cells.
The cells form to create tissues. The tissues, then combine to form the reproductive organs: fallopian tubes, cervix, ovaries, uterus and vagina. These organ make up the female reproductive system.
The Circulatory System
The Circulatory system permits blood and lymph circulation to transport nutrients to and from the cells. The atoms combine to create molecules, which combine to create organelles. The organelles combine to create cells.
The major cells that make up this system are the blood cells and the cardiac muscle cells. They form the tissue, which then forms all the organs that make up this system. The organs are: the heart and blood vessels. They all together form the Circulatory System.
The Digestive System
The Digestive System turns the food you eat into energy your body needs to survive. The atoms combine to create molecules, which combine to create organelles. The organelles combine to create cells.
The main cells that are found in this system are the smooth muscle cells, which forms the tissue. The tissues forms the gastrointestinal tract, which consists of: oral cavity, esophagus, stomach, liver, pancreas, gallbladder, and the large and small intestines. All together these organs create the Digestive System.
The Respiratory System
The Respiratory System consists of specific organs and structures used for the process of respiration in an organism. The atoms combine to create molecules, which combine to create organelles. The organelles combine to create cells.
The major cell for this system is the pneumocytes. The cells combine to form tissues, which in turn combine to form organs. These organs are: lungs, nasal and oral cavities, larynx pharynx, trachea, bronchi and diaphragm. These organs make up the Respiratory System.
The Endocrine System
The Endocrine System is the collection of glands of an organism that secrete hormones. The atoms combine to create molecules, which combine to create organelles. The organelles combine to create cells.
The cells form together to create tissue. Epithelial tissue is found in this system. The tissue forms all the organs found in this system: glands, kidneys, pancreas and ovaries. These organs together make up the Endocrine System.
The Skeletal System
The Skeletal System is the support system for the body. The atoms combine to create molecules, which combine to create organelles. The organelles combine to create cells.
The major cell in this system is the bone cell. The bone cells combine to form connective, which forms the hard bone and cartilage. The hard bone and cartilage make up the entire structure known as the skeletal system.
The Urinary System
The Urinary System eliminates waste from the body, regulates blood volume and pressure, controls levels of electrolytes and metabolites, and regulates blood pH. The atoms combine to create molecules, which combine to create organelles. The organelles combine to create cells.
These cells combine to create tissues. The main tissue in this system is the connective tissue, which holds the kidneys into place. The tissues make up the organs: kidneys, ureter, bladder and urethra. Together these organs create the urinary system.
The Nervous System
The Nervous System controls the voluntary and involuntary actions and transmits signals to different parts of the body. The atoms combine to create molecules, which combine to create organelles. The organelles combine to create cells.
The main cells fond the nervous system are neurons (cell that transmits information through electrical and chemical signals) and glial cells (maintain homeostasis, form myelin and protect neurons). The neuron cell forms the nervous tissue, which carries electrical tissue. This tissue, also, helps form many of the organs located in the nervous system: the brain, brainstem and spinal cord. Together these three organs create the Nervous System.
The Integumentary System
The Integumentary System (skin, nails and hair) is the body system that protects the body from many forms of damage. Atoms come together in the beginning of the cycle of life (atoms, molecules, organelles, cells).
Later on, cells such as surface skin cells, hair cells and nail cells. The cells come together to form the three major tissue layers found in this system: epidermis, dermis and hypodermis. The tissues combine to create the organs such as: the skin, hair and nails. All together these organs create the integumentary system.