BIO30 S 3 2 And 3 3 Describe Rolesof Major Excretory Structures And Identify
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BIO30 S 3 2 And 3 3 Describe Rolesof Major Excretory Structures And Identify

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    BIO30 S 3 2 And 3 3 Describe Rolesof Major Excretory Structures And Identify BIO30 S 3 2 And 3 3 Describe Rolesof Major Excretory Structures And Identify Document Transcript

    • Entry slip: What is urea the by-product of? Lesson 3.2- Describe the roles of the major excretory structures in eliminating waste and helping the body maintain homeostasis. (pp374-376) of Biology-McGraw-Hill Ryerson) I. Homeostasis (p772): a. The body’s maintenance of a relatively constant internal environment (i.e. water content, O2 level, temperature, etc..) b. In this case of homeostasis, the “internal environment” that the body wants is one that is: i. Non-toxic: with all nitrogenous wastes and CO2 removed. A. See http://www.cbc.ca/canada/manitob
    • a/story/2009/02/04/sinclair- inquest.html?ref=rss ii. “Osmoregulated” (osmo = water): has the correct amount of water: A.if you have more than enough water in your body you will urinate more B. if you are dehydrated you will urinate less II. Major excretory structures: a. Circulatory System. i. The system of the heart, blood, blood vessels and capillaries that TRANSPORTS the wastes from the area where they were created to the areas that they are excreted. ii. Renal Arteries supply blood to the kidneys to be cleaned iii. Renal Veins take the clean blood back to the body
    • b.Lungs. i. Respiration excretes CO2 (see Unit 2). c. Kidneys: two organs located in you back that have many functions. In the same way that the lungs are filled with alveoli where gas exchange is performed, the kidneys are filled with “NEPHRONS” surrounded by capillaries where its functions are performed. i. “Filter” – removes urea, uric acid and creatinine from blood. ii. “Regulator”-too much in body is removed and if there is not enough the kidney will “hold back”: A.Water levels B. Mineral levels such as Na+, K+, HCO3-(basic), H+(acidic) and Ca2+ C. pH levels (acidity) iii. “Factory”
    • A.Senses when your red blood cell levels are getting low and will release chemicals to start production of more RBC’s B. Activates Vitamin D production in skin d. Ureters: i. Two tubes that the kidneys release the urine (composed of all urea, uric acid, creatinine, water and minerals) into to be taken to the bladder. e.Bladder: i. Temporary storage space of urine. ii. Can hold up to 600mL or urine. iii. Urination is controlled by two sphincter muscles in the bladder, one of which is involuntary (we cannot control) and one of which we learn how to control when we are children. f. Urethra
    • i. A single tube that carries urine from the bladder out of the body. ii. 20 cm long in males, 4 cm long in females III.Demos: a.Youtube search: “Learn Human Body – Urinary System” Lesson 3.3- Identify structures of the human urinary system from a diagram and describe the function of each. (pp374-376) of Biology-McGraw-Hill Ryerson) I. Homework Assignment: a. Label the handout “Label Major Excretory Structures”. As well, in space around the diagram, list the function(s) of the structures in point form. Due for a completion check the next day.