HLSC-128 Chapter Notes - Chapter 10: Body Plan, Dermis, Mucous Membrane
5 Oct 2016
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Hlsc 128: lecture notes + supplemental chapter 10 textbook notes. Human physiology: from cells to systems (3rd canadian ed. Immune system functions: defends against harmful foreign microbes such as bacteria and viruses, target and kill harmful microbes that end up in the body, remove worn out cells. External defences: physical barriers that protect against microbes. Protects the body form many external threats by not allowing them to enter the body: many lipid soluble substances can still enter the body through skin. Controls hair erection, blood flow to skin and secretion from gland in the skin. Much of the sweat we produce contains chemicals that are toxic to bacteria. Also releases sebum that hydrates the skin and follicles so they do not crack. Stomach acid strong gastric juice able to kill swallowed invaders. Immune systems: two codependent systems, innate system. Key compoents are neutrophils, macrophages, and specific plasma proteins. Quick but limited response to almost any invader.
