Epithelial Tissue
Question: This characteristic of epithelial tissue refers to the fact that it completely lacks blood vessels
Avascularity
This dense, rigid bone tissue makes up 80% of total bone mass
Compact bone
Holocrine glands that secrete sebum onto hair shafts to prevent drying
Sebaceous glands
This band of dense connective tissue connects bone to bone at a joint
Ligament
Composed of 20 to 30 layers of dead, anucleate keratinized cells, this is the most superficial layer of the epidermis
Stratum corneum
This single-layer, flat epithelial tissue lines the alveoli of the lungs and lumen of blood vessels to allow rapid filtration and diffusion
Simple Squamous Epithelium
The process of blood cell production, which takes place in red bone marrow
Hematopoiesis
Formed from densely packed parallel collagen fibers, this tissue forms tendons and most ligaments
Dense Regular Connective Tissue
This muscle tissue type contains bifurcating (branching) cells, striations, and intercalated discs under involuntary control
Cardiac Muscle Tissue
Found in the stratum basale, these tactile cells are sensitive to light touch and release chemicals when compressed
Merkel (Tactile) Cells
Found lining the urinary bladder and ureters, this epithelium changes shape depending on whether the organ is relaxed or stretched
Transitional Epithelium
Stem cells derived from mesenchyme that divide to produce osteoblasts
Osteoprogenitor cells
Characterized by a glassy, smooth matrix, this cartilage type is found in the nose, trachea, and epiphyseal plates
Hyaline Cartilage
Nonstriated, short, and fusiform cells with a single central nucleus describe this muscle tissue found in the walls of hollow internal organs
Smooth Muscle
This clear, translucent epidermal layer containing eleidin is present only in thick skin
Stratum lucidum
Specialized unicellular glands often found in simple columnar and pseudostratified epithelia that secrete mucin
Goblet Cells
This hormone secreted by the parathyroid glands increases blood calcium levels by encouraging bone resorption by osteoclasts.
Parathyroid Hormone (PTH)
Located in intervertebral discs and the pubic symphysis, this cartilage resists compression and acts as a shock absorber
Fibrocartilage
An increase in the overall size of existing cells without an increase in cell number
Hypertrophy
These immune cells found in the stratum spinosum help fight infection in the epidermis
Langerhans cells
This specific epithelial tissue lines the larger airways of the respiratory tract and features cells of varying heights where all cells attach to the basement membrane
Pseudostratified Ciliated Columnar Epithelium
Released from the thyroid gland, this hormone lowers blood calcium levels by promoting calcium deposition in bone and inhibiting osteoclast activity
Calcitonin
All connective tissues in the body originate from this embryonic connective tissue
Mesenchyme
An increase in the overall number of cells in a tissue due to an increased rate of cell division
Hyperplasia
These specialized cells produce a pigment that helps cells shield their DNA from ultraviolet radiation.
Melanocytes