An Introduction to the Body Systems. The Human Body Plan Skeletal System Muscular System Integumentary System. Objectives. Describe four types of tissues that make up the human body. Explain how tissues, organs, and organ systems are organized.
The Human Body Plan
Chemical – atoms combine to form molecules
Cellular – molecules interact to make up cells
Tissue – cells are grouped into tissue
Organ – tissues compose organs
Organ system – organs function together to form organ systems
Organism (individual) – made up of the organ systems
Click on these links to read about the axial parts of the body.
The backboneThe Skeleton Is Divided Into Two Distinct Parts:
Click on these links to read about the appendicular parts of the body.
The lower body
The upper body
The pelvic areaThe Appendicular Skeleton
The bones of the body fall into four general categories:
- A joint at which a wide range of motion occurs.
The main exocrine glands present in the skin are sweat glands and oil glands.
help regulate the bodies temperature.
Sweat glands are distributed throughout the body and release excess water, salts, and urea.
Oil glands secret a substance called sebum.
Sebum is an oily secretion that prevents excess water loss, softens hair and skin, and protects the body by being mildly toxic to some bacteria.
Acne occurs when the ducts of oil glands become clogged with excessive amountsof sebum, dead cells, and bacteria.Glands
Nails are also made primarily of keratin and rest on a bed of tissue filled with blood vessels.
Hair protects and insulates the body and is produced by hair follicles, which are clusters of cells at the base of deep dermal pits.
Hair is composed of keratin and is kept soft by the oil glands associated with the hair follicle.
Hair color is the result of the presence of the pigment melanin in the hair shaft.Hair & Nails