Question

Biol 71 Lab Kurushima S2020 PART B: THYMUS GLAND 1. Read the section titled The Thymus on p. 616 of your textbook. What role do the T cells play in the thymus? Text What role do the epithelial reticular cells perform in the thymus? - Epithelial reticular cells scattered among the lymphocytes produce thymic hormones. 2. Histological examination of the thymus. Please examine and sketch the thymus in the space provided. Be sure to label your sketch with the indicated structures. Thymus t.m. -_ (use a low-power to view this!) • Capsule • Cortex of a lobule . Trabecula (septa) PART C: SPLEEN The spleen is the largest lymphatic organ in the body! Nonetheless, many people have no idea how important the spleen is to our homeostasis 1. Read the section titled The Spleen on pp. 618-619 of your textbo What are the three major roles of the selleen? 1. Text Observe the location of the spleen in a torso model. What abdominopelvic region contains the spleen? 2. Identify the following on a model of the spleen (stand alone, torso, and the blood vessel models): • Hilum of the spleen Do not submit labeling online. • Splenic artery • Splenic vein Lab 14: Lymphatic

Answer 1

Part A Role do the T-cells play in the thymus T-cells originate in the bone marrow and mature in the thymns. In the thymns, T cells multiply and differentiate into helper, regulatory or cytotoxie T-cells or become memory T-cells. They are then send to peripheral tissues or cinculate in the blood on lymphatic system. Once stimulated by the appropriate antigen, helpen t-e ells secrete chemical messengers called cutokines, which stimulate the differentiation of B-cells into plasma cells. Regulatory T cells, which are activated by the various cytokiness- bind to and kill infected cells and cancer cells. Role do the epithelial neticulan celle perform in the thymns in Thymic epithelial reticular cello together with lymphocytes establish the thymic parenchyma. Morphologically they are described by the stellate T wiewpoint shaping a cftoreticulum, a huge and resicular core, a tono- filament-rich cytoplasm, a bounty of desmosomes. Other than the job off offering an auxiliary help for. symphocytes, epithelial reticular cells

are liable for the emission of thymic. hormones which adrance lymphocytes expansion and development. Clinieval proof in currently showing up recomm. - ending such thymic hormones. which advance lymphocyte expansion and development. clinical Proof in currently showing up recommending such thymic hormones utilization' as helpful specialists against immuno deficiency sicknesses and malignant y sicknesses growth. cortex of looule Trabechle Septal Thymus

Pant - B t. Three major roles of the spleen? is clearance of microorganisms and particulate antigens from the blood stream. ür Removal of abnormal red blood cells (RBCs). > Extramedullary hematopoiesis in centein disease. Abdominopelvic region ari The abdominopelvic region is a body region that consists of the abdominal carity and the pelvic carity. Here we have the stomach. uver, and the pancreas. The adrenal glands and the first part of the small intestine, the duodenum, are also found in region 2. Region B is known as the left hypochondrie neaion, which contains og ans such as the speen, colon, left kidney and pancrea.