L1

A thin, flat cell that is often found in areas where diffusion is important.

A cube-shaped cell with a rounded nucleus. It can be found in areas involved in secretion and absorption.

A tall, elongated cell with an oval nucleus. It can be found in areas involved in secretion and absorption.

A single layer of epithelial cells.

Two or more layers of epithelial cells.

A type of simple squamous epithelium that lines blood vessels.

A type of stratified squamous epithelium where the surface cells are dead and filled with keratin.

A type of stratified epithelium that can stretch and change shape.

Structural and functional unit of compact bone, consisting of concentric lamellae surrounding a central canal containing blood vessels, nerves, and connective tissue.

Mature bone cells embedded in calcified bone matrix. They reside in spaces called lacunae and are connected to neighboring osteocytes via cytoplasmic processes through small canals called canaliculi.

Canals that run perpendicular to the long axis of bone, connecting the vascular supply of the periosteum to the central canal and medullary cavity.

Bone tissue that does not contain osteons, consisting of trabeculae surrounding red marrow-filled spaces. It provides support and protection for the red marrow.

Large, multinucleated cells that resorb bone during formation, healing, and remodeling, important in maintaining calcium balance.

Also known as transitional epithelium, this specialized epithelium lines the urinary tract. It has three distinct layers - basal, intermediate, and superficial. It allows for stretching as the bladder fills and empties. It provides protection, but doesn't actively participate in secretion or absorption.

Unicellular exocrine glands are made up of a single, secretory cell. They are scattered throughout mucous membranes and produce mucus. A prominent example is the goblet cell.

Multicellular exocrine glands are composed of groups of epithelial cells that collectively secrete substances. They release their secretions directly onto epithelial surfaces or through ducts.

Exocrine glands release their secretions onto an epithelial surface, either directly or through ducts. They are responsible for various functions such as lubrication, digestion, and protection.

Endocrine glands lack ducts and secrete their products directly into the bloodstream. Their hormones can travel to distant target tissues and regulate various bodily processes.

Bone is a strong and dynamic living tissue containing cells, fibers, and an extracellular matrix. It has a hard, calcified matrix due to the deposition of calcium salts. This mineralized matrix provides support and protection.

Osteocytes are bone cells that live in small cavities called lacunae within the bone matrix. They maintain the bone tissue and are well-connected to the bloodstream.

Compact bone is organized into structural units called osteons or Haversian systems. These systems consist of concentric layers of bone matrix surrounding a central Haversian canal containing blood vessels and nerves.

A specialized connective tissue characterized by a firm, resilient matrix, composed of collagen and elastin fibers, embedded in a ground substance rich in glycosaminoglycans (chondroitin sulfates and keratan sulfate), proteoglycans, and water.

The progenitor cells of chondrocytes that reside in the perichondrium, actively secreting type II collagen and other extracellular matrix components.

The non-living component of cartilage, providing its rigidity, elasticity, and resilience. It consists of collagen and elastic fibers embedded in a ground substance.

The most common type of cartilage, characterized by a glassy, translucent appearance. It provides support and flexibility.

A type of cartilage characterized by the presence of abundant elastic fibers within the matrix, providing flexibility and resilience to structures like the ear.

A type of cartilage with a matrix rich in type I collagen fibers, providing high tensile strength, found in areas like intervertebral discs and the pubic symphysis.

A thin layer of connective tissue surrounding cartilage, providing nutrients and oxygen to the avascular cartilage.

Small cavities within the cartilage matrix where chondrocytes reside and maintain the matrix.