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Tissue

A collection of cells of the same type that perform a common function.

Connective tissue

Tissue that binds and supports body parts.

Muscular tissue

Tissue that moves the body and its parts.

Nervous tissue

Tissue that conducts nerve impulses.

Epithelial tissue

Tissue that covers body surfaces and lines body cavities.

Ground substance

Noncellular material between the cells in connective tissue.

Collagen fibers

Flexible and strong fibers found in connective tissue.

Elastic fibers

Fibers that contain elastin and stretch and recoil.

Fibrous connective tissue

Connective tissue that includes loose and dense connective tissue.

Adipose tissue

A type of loose fibrous connective tissue that stores fat.

Cartilage

A type of supportive connective tissue that is solid yet flexible.

Bone

The most rigid connective tissue, made of collagen and calcium salts.

Blood

Fluid connective tissue made of plasma and formed elements.

Lymph

Fluid connective tissue derived from interstitial fluid.

Neuron

The basic unit of nervous tissue, consisting of dendrites, a cell body, and an axon.

Neuroglia

Support cells that nourish and support neurons.

Epithelial tissue categories

Can be classified as simple or stratified based on cell layers.

Simple squamous epithelium

A single layer of flattened cells found in the lungs for gas exchange.

Stratified squamous epithelium

Multiple layers of cells that protect underlying tissues, such as skin.

Sebaceous glands

Glands that produce sebum, which softens hair and skin and retards bacterial growth.

Homeostasis

A relatively constant internal environment maintained by various body systems.

Negative feedback

A mechanism that reduces the output of a system to maintain homeostasis.

Positive feedback

A mechanism that amplifies a response in the same direction as the stimulus.