A&P Lab 5-7 HW
What does the matrix of bone consist of?
Approximately two-thirds of the weight of bone is composed primarily of calcium salts that form hard, brittle crystals of hydroxyapatite. The other major component of the bony matrix is the collagen fibers that provide tensile strength to bone.
How is giantism similar to acromegaly?
Both disorders result from abnormal cartilage and soft tissue growth.
In exfoliative cytology, epithelial cells are removed and examined without any lasting damage to the tissue from which these cells are removed. Why is there usually NO lasting damage?
Epithelial tissue is capable of regeneration.
Osteoblast
Immature bone cell that secretes organic components of matrix
Which bone cells are responsible for the formation of new bone matrix?
Osteoblasts are the bone cells that produce new bone matrix.
Osteogenic cells
Stem cell whose divisions produce osteoblasts
Which surface attaches to the underlying epithelial cells or deeper tissues?
basal
Exfoliative cytology involves the removal of epithelial cells for examination. Which of the following is NOT a clinical application of exfoliative cytology?
examination of cardiac muscle cells after a heart attack
In a second-degree burn, the entire epidermis and perhaps some of the dermis are damaged. Which of the following functions of the skin is NOT typically affected by a second-degree burn?
excretion and thermoregulation through sweat glands
What is the correct sequence of events in the repair of a fracture?
hematoma formation, callus formation, spongy bone formation, and compact bone formation
Osteocyte
mature bone cell that contains the bone matrix
Osteoclast
multinucleate cells that secret acids and enzymes to dissolve bone matrix
A marked loss in strength and elasticity of connective tissue characterizes Marfan's syndrome. Which connective tissue component imparts strength and elasticity?
proteinaceous connective tissue fibers
The proximal tubule of the nephron (kidney tubule) in the kidney is composed of which type of epithelium?
simple cuboidal epithelium
The wall of the alveolus (air sac) in the lung is composed of which type of epithelium?
simple squamous epithelium
Which of the three muscle cell types has multiple nuclei?
skeletal
Melanocytes
store melanin in melanosomes
Which epithelium is responsible for protection, secretion, and absorption?
stratified cuboidal
The epithelium of the esophagus is composed of which type of epithelial tissue?
stratified squamous epithelium
In which layer of the skin are melanocytes found?
stratum basale
Healthy skin cells require a constant supply of blood. In decubitus ulcers, or bed sores, this blood supply is hindered because superficial blood vessels are compressed. Which layer(s) of the skin hold(s) such compressed blood vessels?
the papillary and reticular layers of the dermis
