Red blood cells are small, flattened, doughnut-shaped disks whose centers are thinner than their edges. Red blood cells function as carriers of oxygen and carbon dioxide. Platelets are small pieces of megakaryocyte cytoplasm and cell membrane. They participate in the clotting process and the repair process in blood clotting. Lymphocytes are classified into two types: B lymphocytes and T.
In this lesson extension students will extend their knowledge of the role of red blood cells, white blood cells and platelets by creating a short screen play that captures their role in the body.
T cells are a type of white blood cell known as a lymphocyte.Lymphocytes protect the body against cancerous cells and cells that have become infected by pathogens, such as bacteria and viruses.T cell lymphocytes develop from stem cells in bone marrow.These immature T cells migrate to the thymus via the blood.The thymus is a lymphatic system gland that functions mainly to promote the.
This resource lists essay titles and the indicative content from the mark schemes, featured in the previous specifications. It prepares students for the essay in A-level Biology Paper 3. Biology 2410 (BIOL5) Year Question Title 2013 10 a The membranes of different types of cells are involved in many different functions 2013 10 b There are many different types of relationships and interactions.
Recall that blood is a connective tissue. Like all connective tissues, it is made up of cellular elements and an extracellular matrix. The cellular elements—referred to as the formed elements—include red blood cells (RBCs), white blood cells (WBCs), and cell fragments called platelets.The extracellular matrix, called plasma, makes blood unique among connective tissues because it is fluid.
While cells do share many traits in common, there are differences. The cells that make a tree are not the same that make a dog. Even within the same organism, there are different types of cells. Your skin cells are different than muscle cells, or bone cells, or blood cells. Like organisms, cells can be characterized by their traits. Two common.
The white blood cells are attracted to the sites of microbial presence by factors called chemotactic factors. If the travelling leukocytes find any foreign substance in the tissues, the leukocytes accumulate in large numbers around the foreign substance; and the reactions initiated and mediated by the white blood cells lead to the removal of the intruder.
What are the functions of blood cells? The main job of red blood cells, or erythrocytes, is to carry oxygen from the lungs to the body tissues and carbon dioxide as a waste product, away from the tissues and back to the lungs. Hemoglobin (Hgb) is an important protein in the red blood cells that carries oxygen from the lungs to all parts of our body. The main job of white blood cells, or.