Study Guide Essay Example

Study Guide Essay Example Study Guide Essay Study Guide Essay Gas Exchange gas exchange, the uptake of oxygen from the environment and the discharge of arbor dioxide to the environment, takes place in the lungs across the surface of the alveoli [Fig. 42. 25, p 919 (Fig. 42. 24, p 919)] oxygen is transported in the blood bound to hemoglobin inside red blood cells carbon dioxide is carried out of the body in three ways: I) dissolved in blood (7%); it) bound to hemoglobin (23%); and iii) in plasma as bicarbonate ions (70%) see Figure 42. 30, p 923 (Chapter Review p 927 (p 927)) for an overview of loading and unloading of respiratory gases (- omit information on partial pressure of oxygen and carbon dioxide) Lecture 4: The Immune System Chapter 43 (43): The Immune System Recognition and response, up 929-930 (up 930-931) Innate immunity of vertebrates, up 932-934 (up 933-936) Adaptive (Acquired) immunity, up 935-944 (up 936-945) 5 two major defense mechanisms in the body: Innate immunity and Adaptive (Acquired) immunity Innate immunity includes: external (barrier) defenses such as the skin and mucous membranes; and internal defenses, including I) cellular innate defenses such as phagocyte white cells, sinkholes, dendrites cells, and natural killer cells, it) antimicrobial proteins such as lezzy and interferons, and iii) inflammatory espouse Adaptive (Acquired) immunity includes: responses to antigens, which are foreign molecules from viruses, bacteria, fungi, protozoa and parasitic worms (also pollen and transplanted tissue) special cells called lymphocytes recognize and respond to specific antigens and for every antigen there will be a specific pool of lymphocytes with receptors exactly two main classes of lymp hocytes: B cells important in the production of antibodies and T cells two types Exotic T cells important in directly attacking infected cells and Helper T cells activate B cells and Exotic T cells. MUCH (major historiographys complex) molecules display antigen fragments on cell surface called antigen presentation class I MUCH molecules are found on all nucleated cells; and class II MUCH molecules found on B cells, macrophages and dendrites cells Adaptive immunity has four main characteristics: 1) diversity million(s) of different antigen receptors; 2) self-tolerance there is the lack of reactivity against an animals own molecules and cells; 3) cell proliferation activation of lymphocytes greatly increases the number of B and T cells specific for an antigen; 4) immunological Emory remembers antigens it has met before Adaptive (Acquired) immunity includes two main immune responses: humeral response defends against extracurricular pathogens antibodies attack toxins, bacteria and viruses outside cells B cells important in the humeral response and are activated by Helper T cells and once activated produce I) plasma cells which secrete antibodies that destroy invaders and I) memory cells [Fig. 43. 18, p 942 (Fig. 43. 9, p 944)] cell-mediated response defends against intracellular pathogens and cancer Exotic T cells directly attack and destroy cells infected by bacteria, viruses etc. Exotic T cells important in cell-mediated response when activated by Helper T cells and binding with infected cell displaying class I MUCH + antigen, they release performing and granaries (proteolysis enzymes), which destroy infected cells and cancer cells; memory cells are also produced [Fig. 43. 17, p 941 (Fig. 43. 18, p 944)] Helper T cells must also be activated to participate in both immune responses Helper T cells are activated after binding to a class II MUCH molecule + antigen displayed on the surface of antigen presenting cells (APPC) Lecture 5: Somersaulting and Excretion Homeostasis, p 860 (p 861) Triangulation, up 862-867 (UP 862-867) Chapter 44 (44): Somersaulting and Excretion Somersaulting, osmosis, osmotic challenges, up 953-956 (up 954-957) Structure and function of the mammalian excretory system, up 962-963 (up 962-964) Overview of excretory processes, p 960 (p 961) homeostasis = steady state regulation of the animals internal environment, so can maintain within range in which metabolic processes can occur Triangulation: process by which animals maintain body temperature in a range that allows cells to function effectively isotherms are animals, which derive most of their heat from the external environment