The layer of skin that contains the blood vessels, nerves, hair follicles, sweat glands, and sebaceous glands is the

Melanin is produced in the

The loop of Henle is located in the

Bronchitis is a condition caused by

Respiration involves

Pus is a collection of white blood cells and cell debris at an infection site.

Cellular respiration is how cells use carbon dioxide to breathe.

Acne is the result of poor hygiene habits.

The blood releases oxygen and picks up carbon dioxide in the nephrons.

Urine is a waste product produced by the cells.

a structure that produces sebum

a structure that contains the vocal cords

branches of the trachea that extend into the lungs

a disease of the lungs that results in fluid buildup in the alveoli