APHY 102 IVY TECH Final-SUMMER 2022 Solved 100% Correct

What regulates pituitary gland secretion? - ANSWER-The pituitary gland is directly connected to the hypothalamus. Secretion from the 2 lobes of the pituitary gland is controlled by different methods by the hypothalamus What is a hormone and how does it act? - ANSWER-Hormones are chemical messengers that are responsible for regulation. They are secreted into body fluids, mainly blood. It has specific actions on target tissues, which are any tissue that has specific receptors for that particular hormone. Compare and contrast glucagon and insulin. - ANSWER-o Insulin helps the cells absorb glucose, reducing blood sugar and providing the cells with glucose for energy. When blood sugar levels are too low, the pancreas releases glucagon. o Glucagon instructs the liver to release stored glucose, which causes blood sugar to rise. • Both work to keep blood glucose concentration constant, but glucagon breaks down glycogen into glucose and insulin forms glycogen from glucose. How are pheromones different than hormones? - ANSWER-o Hormones are both produced and act inside the body of an organism whereas, o pheromones are produced interiorly, but function outside the body. Hormone changes the interior of the body and finally causes to have behavioral alterations, whereas pheromones are capable of directly changing the social behaviors of others. Hormones are present in both animals and plants, but pheromones are present in animals only How is inhibin used in the body? - ANSWER-One of two hormones (designated inhibin-A and inhibin-B) secreted by the gonads (by Sertoli cells in the male and the granulosa cells in the female) and that inhibit the production of follicle-stimulating hormone (FSH) by the pituitary gland. Differentiate between paracrine, autocrine, endocrine, and exocrine glands. - ANSWER-o Paracrine - hormones enter the interstitial fluid but affect only neighboring cells. o Autocrine - hormones affect only the secreting cell. o Endocrine - hormones are secreted from the interstitial fluid into the bloodstream and act on target cells. o Exocrine - secretions enter tubes or ducts that lead to body surfaces. How is diabetes insipidus different than diabetes mellitus? - ANSWER-o Diabetes mellitus is characterized by high levels of sugar in the blood while o diabetes insipidus is a disease where kidneys are unable to conserve water Describe steroid hormones. - ANSWER-All steroid hormones are derived from cholesterol. These include sex hormones, such as testosterone and the estrogens, and secretion of the adrenal cortex, including aldosterone and cortisol Describe tropic hormones - ANSWER-a hormone that stimulates an endocrine gland to grow and secrete it's hormones. Describe normal blood: number of each cell type, pH. - ANSWER-Blood is about 8% of body weight. Adult blood volume is about 5 L. RBC count is usually 4,600,000-6,200,000 in males, 4,200,000-5,400,000 in females. WBC are usually 5,000-10,000 per cubic mm of blood. Platelets are usually 130,000-360,000 per cubic mm of blood. Normal blood pH is around 7.4. How does the Rh factor affect a developing fetus and its mother? - ANSWER-o Rh positive - presence of antigen D or other Rh antigens on the RBC membranes. o Rh negative - lack of these antigens § If a mother is Rh negative and her baby is Rh positive, her antibodies form to fight Rh-positive blood cells. If a mother is Rh positive and her baby is Rh positive, her antibodies attack the baby's RBC. Complications can lead the baby to develop erythroblastosis fetalis or hemolytic disease What antigens can be found on RBC? What antibodies can be found in the plasma? How do these create different blood types? - ANSWER-o Antigens: A, B, AB, or none. o Antibodies: A, B, AB, or none. o Antibodies are associated with some blood types; in general, a person produces antibodies against antigens that are not present on his/her RBC membranes. The antigens expressed on the red blood cell determine an individual's blood group. Describe the different leukocytes and their origins. - ANSWER-o Neutrophils - most numerous, 54-62% of WBCs, first to arrive to fight infections, elevated in bacterial infections, multi-lobed nucleus. o Eosinophils - deep red granules in acid stain, bi-lobed nucleus, fight allergic reactions and against parasitic worm infestations, 1-3% of WBCs. o Basophils - Deep blue granules in basic stain, release histamine and heparin, <1% of WBCs. o Monocytes - largest of all blood cells, kidney- or oval-shaped nuclei, become macrophages, 3-9% of WBCs, phagocytize bacteria, dead cells, and other debris. o Lymphocytes - slightly larger than RBCs, large spherical nucleus surrounded by a thin rim of cytoplasm, T and B cells, B cells produce antibodies, 25-33% of WBCs. Compare the formed elements of the blood. - ANSWER-o Form mostly in red bone marrow, and are called "formed elements": § Red blood cells (R B C s): Red blood cells (erythrocytes). These carry oxygen from the lungs to the rest of the body