Body Organization.

The smallest chemical unit of an element that retains the properties of that element. Contains electrons, protons, and neutrons.

A chemical combination of two or more atoms. Bonds may be covalent or ionic.

The smallest and most fundamental unit of life. The basic building block of the human body.

A specialized structure within a cell that performs a specific function (e.g., mitochondria, nucleus).

A group of similar cells working together to perform a specific function.

A structure made up of multiple tissue types performing complex functions.

Several organs working together to carry out a specialized function (e.g., respiratory system).

From simplest to most complex: organelles, cells, tissues, organs, systems.

Tissue that performs excretion, absorption, secretion, diffusion, and protection.

Tissue that provides a supporting network for organs and muscles.

Tissue that controls and coordinates body activities.

Tissue that mediates movement.

A body plane that divides the body into upper (superior) and lower (inferior) portions.

A body plane that divides the body into anterior (front) and posterior (back) portions.

A body plane that divides the body into left and right portions.

A sagittal plane that runs through the midline, dividing the body into equal left and right halves.

Body cavity composed of the cranial cavity and the spinal (vertebral) cavity.

Body cavity containing the thoracic, abdominal, and pelvic cavities.

Anatomical directional term meaning toward the back of the body. Opposite of anterior.

Anatomical directional term meaning toward the front of the body. Opposite of posterior.

Anatomical directional term meaning closer to the midline. Opposite of lateral.

Anatomical directional term meaning toward the side of the body. Opposite of medial.

Anatomical directional term meaning above.

Anatomical directional term meaning below.

Anatomical directional term meaning toward the front.

Anatomical directional term meaning toward the back.