26th November 2019

quizlet

What unit of bone consists of a central canal?

Structural unit of compact bone consisting of a central canal, called the haversian canal, surrounded by a number of concentric rings of bony matrix called lamellae. channels lying at right angles to the central canal, connecting blood and nerve supply of the periosteum to that of the haversian canal.

Similarly, you may ask, what is found in the central canal of bone?

Each osteon consists of concentric layers, or lamellae, of compact bone tissue that surround a central canal, the haversian canal. The haversian canal contains the bone's blood supplies. The boundary of an osteon is the cement line.

What does the central canal do?

The central canal, also known as ependymal canal, is the cerebrospinal fluid-filled space that runs longitudinally through the length of the entire spinal cord. The central canal is continuous with the ventricular system of the brain.

What can be found in the central canal?

It is filled with cerebrospinal fluid, and lined by ciliated, columnar epithelium, outside of which is an encircling band of gelatinous substance, the substantia gelatinosa centralis (or central gelatinous substance of spinal cord).

What is found in the central canal of bone?

What are the four stages in the healing of a bone fracture?

Bone turnover rates differ depending on the bone and the area within the bone. There are four stages in the repair of a broken bone: 1) the formation of hematoma at the break, 2) the formation of a fibrocartilaginous callus, 3) the formation of a bony callus, and 4) remodeling and addition of compact bone.

Which hormones affect bone growth and development?

The estrogen induces FasL in osteoclasts causing them to self-destruct by apoptosis and in this way slows up the destruction of bone. Calcitonin and thyroid stimulating hormone (TSH), both of which inhibit the activity of osteoclasts. Calcitriol (1,25[OH]₂ vitamin D₃. Needed for the deposition of calcium into bone.

What part of the bone produces blood cells?

In adults, active marrow is found inside the spine, hip and shoulder bones, ribs, breastbone, and skull. However, bone marrow found in the spine and hip has the richest source of bone marrow cells. Bone marrow is contained within bones. All blood cells are produced in the bone marrow.

Which hormone inhibits bone growth?

Parathyroid Hormone (PTH) is a peptide hormone produced by the parathyroid glands. It binds to receptors in the bone and kidney. A decrease in serum calcium concentration and an increase in serum phosphorous concentration stimulate PTH secretion.

Which bones undergo interstitial lengthening?

Appositional growth (periosteum and endosteum) Only the bones located in the appendages experience interstitial lengthening All bones undergo widening, but only some undergo interstitial lengthening. Which bones undergo in- terstitial lengthening? This specifically transpires at the epiphyseal plates.

What is the function of the bone marrow?

Bone Marrow Function. The major function of bone marrow is to generate blood cells. Bone marrow contains two main types of stem cells. Hematopoietic stem cells, found in red marrow, are responsible for the production of blood cells.

When a bone forms from a fibrous membrane The process is called what?

When a bone forms from a fibrous membrane, the process is called [endochondral] ossification. False; intramembrous ossification is the process when a bone forms from a fibrous membrane. False; Cartilage bones develop from hyaline cartilage structures. The organic bone matrix is called the [osteoid].

What is the function of the osteocytes?

Osteocytes are mature osteoblasts that have become trapped within the very bone matrix they produced. Osteocytes continue to form bone to some degree, which is important for maintaining the strength and health of the bone matrix. However, osteocytes perform functions that extend far beyond simple maintenance.

What is the function of perforating fibers?

They are part of the outer fibrous layer of periosteum, entering into the outer circumferential and interstitial lamellae of bone tissue. Sharpey's fibres are also used to attach muscle to the periosteum of bone by merging with the fibrous periosteum and underlying bone as well.

What is the outer covering of the bone?

The tough, thin outer membrane covering the bones is called the periosteum. Beneath the hard outer shell of the periosteum are tunnels and canals through which blood and lymphatic vessels run to carry nourishment for the bone. Muscles, ligaments, and tendons may attach to the periosteum.

What is the name of the small cavities that contain the osteocytes in bone tissue?

are tiny cavities located between the lamellae that contain the spider-like osteocytes. Hair-like canals called canaliculi, filled with extracellular fluid, radiate from the lacunae.

Which bones are unpaired?

The unpaired bones of the human skull are: frontal, occipital, ethmoid, sphenoid, mandible and vomer. The frontal bone is self explanatory in name.

Which bones form the calvaria?

The calvaria (skullcap) is made up of the superior portions of the frontal bone, occipital bone, and parietal bones. In the human skull, the sutures between the bones normally remain flexible during the first few years of postnatal development, and fontanelles are palpable.

Which hormone increases osteoclast activity to release?

ch. 6

Question	Answer
the process of bones increasing in width is known as	appositional growth
which cells accomplish the process of resorption	osteoclast
which hormone increases osteoclast activity to release more calcium ions into the bloodstream	parathyroid hormone

What is the main function of the skeletal muscle?

Support and Movement. Skeletal muscles move the body. Skeletal muscle contractions pull on tendons, which are attached to bones. If contraction of the muscle causes the muscle to shorten, the bone and, thus, the body part will move.

What is the definition of Intramembranous ossification?

Intramembranous ossification is one of the two essential processes during fetal development of the gnathostome (excluding chondrichthyans such as sharks) skeletal system by which rudimentary bone tissue is created.

When the epiphyseal plate is replaced by bone?

6 Review Questions B

Question	Answer
When cartilage is produced at the epiphyseal side of the metaphysis at the same rate as bone is deposited on the opposite side, bones	grow longer
When the epiphyseal plate is replaced by bone	long bones have reached their adult length

Which bone is not part of the facial complex?

The primary bones of the face are the mandible, maxilla, frontal bone, nasal bones, and zygoma. Facial bone anatomy is complex, yet elegant, in its suitability to serve a multitude of functions. The image below provides an overview of the anterior features of the skull.

What gives bones their flexibility?

The matrix of bone contains inorganic salts, primarily hydroxyapatite and some calcium carbonate, and collagen fibers. – The process of calcification occurs only in the presence of collagen fibers. – Mineral salts confer hardness on bone while collagen fibers give bone its great tensile strength.

What unit of bone consists of a central canal?

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