2018 waec gce biology essay 1a the skeleton is the site of haematopoiesis, the development of blood cells which occurs in the bone marrow. As discussed in section 1, undifferentiated haematopoietic cells are, in general, located in the bone marrow the model presented in this paper subdivides these cells into two groups: the undifferentiated cells located in the sc-compartment and the undifferentiated cells located in the dc 0 -compartment. Free essays available online are good but they will not follow the guidelines of your particular writing assignment if you need a custom term paper on science reports: leukemia, you can hire a professional writer here to write you a high quality authentic essay.
• bone marrow the center of bones capable of producing all red and white blood cells in the adult • cortex the outer portion of any organ • cytoplasm the portion of a cell between the nucleus and the membrane. Bone marrow endothelial cells (bmecs) form a network of blood vessels that regulate both leukocyte trafficking and haematopoietic stem and progenitor cell (hspc) maintenance. Haematopoiesis is the group of processes by which all formed elements of blood are created differentiated haematopoietic cells include erythrocytes, platelets and nearly a dozen types of leukocytes (white blood cells), which are responsible for both innate and adaptive immune surveillance and performance. Medullary cavity - (bone marrow) refers to the cavity within the bone, that is lined with cells (endosteum) and filled with bone marrow in the adult, this can also be identified as either red or yellow marrow.
Bone remodeling is a highly complex process by which old bone is replaced by new bone, in a cycle comprised of three phases: (1) initiation of bone resorption by osteoclasts, (2) the transition (or reversal period) from resorption to new bone formation, and (3) the bone formation by osteoblasts [10, 11. Haematopoiesis is the process by which blood and immune cells are replenished from a finite number of resident bone marrow (bm) haematopoietic stem cells (hscs) regulatory molecules within the bm microenvironment contribute developmental signals to an interactive network capable of ensuring ordered. In addition to the mechanical functions to maintain body shape, providing the possibility of movement and protection of internal organs, the skeletal system is also a organ of haematopoiesis: the bone marrow is responsible for the formation of new blood cells.
2018 waec gce biology essay questions and answers the skeleton is the site of haematopoiesis, the development of blood cells which occurs in the bone marrow. Examine slide #25 which is a cross-section of a rib containing bone marrowthe marrow normally fills the entire cavity, however, on some slides the marrow is shrunken by fixation and has pulled away from the bone. Haematopoiesis (n) 1 the development and formation of various types of blood cellshematopoiesis can take place in the bone marrow (medullary) or outside the bone marrow (hematopoiesis, extramedullary. Under the microscope, in a section of bone stained with hematoxylin - eosin, bone marrow is a spongy structure that sits between the spicules of cancellous bone 2 bone marrow, hematopoiesis the bone marrow is made up of very loose connective tissue highly vascularized, with predominant sinusoid capillary.
Spongy bone contains red bone marrow, which is the site of erythropoiesis the shaft of the long bone is the diaphysis and houses yellow bone marrow, which mainly functions for fat storage articular cartilage is found on the exterior of the bone and helps to lubricate and provide cushioning for joints. All blood cell types arise from hematopoietic stem cells (hscs) that reside mainly in the bone marrow (bm), a major site of adult hematopoiesis blood is one of the most regenerative and plastic tissues, and millions of old blood cells are replenished with new ones each second during life. The regeneration of the haematopoietic system under such situations is called stress haematopoiesis and can be induced by bone marrow transplantation 18, radiation and chemotherapy 19, bleeding 20 and infection 21. There is a large storage pool of mature neutrophils in the bone marrow, termed the bone marrow reserve these neutrophils may be rapidly mobilized during an inflammatory episode or in response to infection, resulting in a dramatic rise in circulating neutrophil numbers.
Anatomy question (solved) march 28, 2012 a bone marrow biopsy of mr bongalonga, a man on a long -term drug therapy shows an abnormally high percentage of nonhematopietic connective tissue what condition does this indicate what short and long term treatments are there. Haematopoiesis: an integrated view over the systems biology keywords: stem cells, haematopoiesis, computational located in the bone marrow hsc have the. Bone marrow transplants are used in certain patients the patient's bone marrow is killed by high doses of drugs and radiation the bone marrow is then replaced by a donor's marrow or the patient's marrow that was remove before the high amounts of drugs and radiation. White blood cells essay sample white blood cell (wbc)—a white blood cell is one of the three main types of blood cells they are produced in the bone marrow and released into the blood.
The liver is the main site of embryonic haematopoiesis this function of the liver ceases before birth (bone marrow having been supplementing the haematopoiesis performed by the liver from about 5 months gestation. Long bones also have a medullary cavity, which is located in the center of the bone and stores the marrow next you have short bones , which include the bones of the ankle and wrist (tarsals and carpals. All chapters have been revised to include new aspects of molecular biology and flow cytometry diagnostics many new schematic diagrams and color illustrations have been added to illustrate blood and bone marrow pathology.