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Chapter 16 - Homeost

A level Biology Chapter 16 - Homeostasis

QuestionAnswer
Exercise causes an increase in heart rate. Describe the role in receptors and of the nervous system in this process? Chemoreceptors detect rise in CO2 / pressure receptors detect rise in blood pressure; 2. Send impulses to medulla; 3. More impulses to SAN; 4. By sympathetic pathway / parasympathetic for pressure receptors.
What is glycogenesis? (glyco->genesis) The conversion of glucose into glycogen when blood glucose levels are too high
What is glycogenolysis? (glyco -> lysis) The breakdown of glycogen to glucose when blood glucose levels are too low
What is gluconeogenesis? (gluco -> new -> genesis) The production of glucose from other sources which are not carbohydrate like glycerol or amino acids
Describe the role of glucagon in gluconeogenesis? Glucagon activates enzymes that converts amino acids into glucose
Explain how increasing a cell's sensitivity to insulin will lower the blood glucose concentration? More insulin binds to receptors Insulin opens more channel proteins so more glucose can diffuse in
Explain how inhibiting adenylate cyclase may help to lower the blood glucose concentration Less ATP to cAMP made Less cyclase activated so less glucose.
Like other mammals, seals produce urine which is more concentrated than their blood plasma. Explain the role of the loop of Henle in producing concentrated urine. 1. sodium ions diffuse into descending limb; 2. water moves out of descending limb; 3. sodium ions actively removed from ascending limb; 4. ascending limb impermeable to water; 5. low WP l in tissue fluid; 6. water leaves collecting duct; 7. by osmosis
Created by: ksatti12
 

 



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