BODY PLANES:  Imaginary flat surfaces

• Sagittal - divides body along the longitudinal plane, into right and left sides.
• Transverse (Cross-Section, Horizontal) - right angles to the longitudinal plane, separates cranial vs. caudal.  (Superior from inferior in biped)
• Frontal - Separates dorsal from ventral in quadruped, and anterior from posterior in biped.

LEVELS OF STRUCTURAL ORGANIZATION:

ORGANELLE
Any of various membranous sacs or other compartments inside the cell that separate different metabolic reactions within the cellular space and in time.

CELL
Smallest living unit; may live independently or may be a specialized part of a multicellular organism.

TISSUE
A group of cells and intercellular substances functioning together in a specialized activity.

ORGAN
One or more types of tissues interacting as a structural and functional unit.

ORGAN SYSTEM
Two or more organs that interact chemically and or physically to perform a common task.

ORGAN SYSTEMS

• Integumentary
• Skeletal
• Muscular
• Nervous
• Circulatory
• Lymphatic

FOUR CATEGORIES OF TISSUES:

• Epithelial
• Connective
• Muscle
• Nervous

TYPES OF EPITHELIAL TISSUE:

• Squamous


• Cuboidal


• Columnar

TYPES OF CONNECTIVE TISSUE:

• Fibrous
• Adipose
• Bone
• Cartilage
• Blood