Describe the general functions of the major systems of the human body.

Integumentary System: acts as a barrier to protect the body from the outside world (ie. skin, hair, and nails)

Circulatory System: carries oxygen and nutrients to cells, carries waste away from cells (ie. heart and blood vessels (veins and arteries))

Digestive System: converts food into molecules that can be used by cells (ie. mouth, esophagus, stomach, small intestine, large intestine)

Respiratory System: provides oxygen to the blood and removes carbon dioxide from the body  (ie. nose, mouth, pharynx (throat), trachea, and lungs)

Immune System: fights off illness and disease  (ie. lymph nodes, white blood cells, and spleen)

Muscular System: allows for movement  (ie. cardiac muscles, skeletal muscles, and smooth muscles)

Nervous System: coordinates all body functions, sends signals to and from all parts of the body  (ie. brain, spinal cord, and neurons)

Skeletal System: support the body, protect internal organs, store minerals  (ie. bones and joints)

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.