Anatomy and Physiology Answer Key

Neural stem cells in the brain can produce nerve

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Unformatted text preview: hair follicles give rise to the hair follicle and epidermal cells. (b) Skin, stem cells in the brain, digestive tract (as described in more detail in (a) above). (c) Blood cells have a short life in circulation as opposed to other cells, such as neurons, which are long-lived. The Human Transport System (page 114) 1. (a) Head (b) Lungs (c) Liver (d) Gut (intestines) (e) Kidneys (f) Genitals/lower body (a) Lack of a nucleus allows more space inside the cell to carry Hb (hence greater O2 carrying capacity). (b) Lack of mitochondria forces the red blood cells to metabolize anaerobically so that they do not consume the oxygen they are carrying. 4. Hemaotpoiesis (page 113) Any of: Presence (WBC) or absence (RBC) of nucleus. Color, reflecting presence (RBC) or absence (WBC) of respiratory pigment, hemoglobin. Shape and size (smaller, dish shaped RBCs vs larger, rounded WBCs. Mitochondria present in WBCs, absent in RBCs. 3. e.g. as a result of an allergy or a parasitic (as opposed to bacterial) infection. (d) Elevated lymphocyte count: Infection or response to vaccination. (a) Elevated eosinophil count: Allergic response such as hay fever or asthma. (b) Elevated neutrophil count: Microbial infection (c) Elevated basophil count: Inflammatory response Biozone International 2009 Photocopying Prohibited 19 The Human Heart (page 115) 1. (a) (b) (c) (d) Pulmonary artery Vena cava Right atrium Right ventricle (e) (f) (g) (h) Aorta Pulmonary vein Left atrium Left ventricle Positions of heart valves Pulmonary artery (a) Myogenic: The heart muscle is capable of rhythmic contraction independently of any external nervous stimulation. (b) Evidence: When the heart is removed from its nervous supply (if provided with adequate oxygen, ions, and fluids) will continue to beat. 5. Left atrium Heavy exercise alters blood composition (lowering blood oxygen and pH) and increases venous return to the heart. These changes stimulate the accelerator centre in the medulla either directly (via blood composition) or via sensory impulses from stretch receptor...
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This document was uploaded on 01/28/2014.

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