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SBI4U Homeostasis Name: _________________________ Multiple Choice. Choose the most correct answer for each, answer in the space provided. [17] _____ 1. When a person sweats and does not drink enough fluid: a) less reabsorption of water occurs c) the pituitary gland releases ADH b) urine will become less concentrated d) all of the above ______2. The nitrogen that must be secreted comes from: a) the metabolic breakdown of c) the deamination of proteins carbohydrates d) the atmosphere b) the nitric buffer system ______3. Which of the following describes a positive feedback reaction? a) Oxytocin is released causing the uterus to contract releasing more oxytocin b) Low blood pressure causes ADH to be released causing water to be retained by the kidneys c) A fever causes sweat to be released to the skin d) All of the above The following table shows the results of an experiment with a functioning mammalian kidney Substance In Bowman’s Capsule In Urine X 0.1 g/L 0.1 g/L Y 0.0 g/L 1.0 g/L Z 1.3 g/L 0.0 g/L Refer to the above table for the next three questions. ______4. Substance X was likely: a) reabsorbed b) not reabsorbed, not secreted c) reabsorbed and secreted d) secreted, not filtered through glomerulus e) not reabsorbed and secreted ______5. Substance Y was likely: a) reabsorbed b) not reabsorbed, not secreted c) reabsorbed and secreted d) secreted, not filtered through glomerulus e) not reabsorbed and secreted ______6. Substance Z is most likely: a) glucose b) urea c) proteins ______7. Antidiuretic hormone causes: a) the urine to become more concentrated b) the urine to become less concentrated c) more urine to be excreted d) blood pressure to decrease ______8. Dendrites carry nerve impulses: a) towards the cell body b) away from the cell body c) across the synapse d) to the effector d) toxins ______9. Co-ordination of motor activities in mammals is a function of the: a) cerebellum c) pons b) cerebrum d) medulla oblongata ______10. In a resting neuron the potassium ions are: a) in equal concentration outside and inside b) in greater concentration inside the neuron c) in greater concentration outside the neuron d) negatively charged ______11. The target cells for Follicle Stimulating Hormone are found in the: a) pancreas c) hypothalamus b) ovaries d) pituitary gland ______12. The adrenal medulla secretes which of the following? a) acetylcholine b) cortisol c) epinephrine d) cortisone _____13. Exocytosis is used by the synaptic vesicles to remove their contents at which of the following? a) dendrite d) postsynaptic membrane b) axon e) presynaptic membrane c) nodes of Ranvier ______14. Given the steps shown below, which is the correct sequence for transmission at a chemical synapse? I. neurotransmitter binds with receptor II. calcium ions rush into neuron’s cytoplasm III. action potential depolarizes the presynaptic membrane IV. ion gate opens to allow particular ion to enter cell V. synaptic vesicles release neurotransmitter into the synaptic cleft a) I, II, III, IV, V c) III, II, V, I, IV e) V, I, II, IV, III b) II, III, V, IV, I d) IV, III, I, II, V ______15. The autonomic division of the nervous system: a) is involved in conscious thought d) controls voluntary muscles b) is involved in learning e) all of the above c) controls unconscious life-sustaining activities ______16. Parasympathetic stimulation would result in which of the following? a) Increased breathing rate c) increased heart rate b) pupil dilation d) decreased breathing rate ______17. Integration of simple responses to certain stimuli, such as the knee jerk response, is accomplished by which of the following? a) spinal cord c) corpus callosum e) medulla oblongata b) hypothalamus d) cerebellum Match the lettered items with the correct statement below. [10] A/ a) Ectotherm c) Reabsorption b) Positive feedback d) Deamination e) Glomerulus f) Endoderm _____ 21. nutrients move from renal tubules to blood vessels _____22. increases in intensity of response to stimulus _____23. removal of amino group from amino acid _____24. capillary bed which filters the blood _____25. depend on air temperature to regulate body B/ a) Growth hormone b) Insulin c) Epinephrine d) Thyroxine _____26. stimulates the development of sperm _____27. increases the absorption of glucose by cells _____28. regulates metabolism _____29. regulates the development of long bones _____30. produced in times of stress e) Testosterone f) Calcitonin Label the following diagrams [6]. a) ______________ d) _____________ g)______________ j) ______________ b) ______________ e) _____________ h) ______________ k) ______________ c) ______________ f) _____________ i) ______________ L) ______________ a) d) b) c) f) g) i) h) j) k) e) l) Answer the following on the foolscap provided. 31. Why is a sharp blow to the lower back part of the skull extremely dangerous? [2] 32. Describe why negative feedback is preferable to positive feedback in most situations. [2] 33. Stepping on a tack is likely to stimulate a reflex arc. Describe the parts of a reflex arc and the advantages of having messages transmitted in this fashion. [2] 32. Identify four differences between the blood entering the kidney and the blood leaving the kidney. [4] 33. Body temperature in endotherms is generally maintained within a narrow range. Describe two situations where this is not the case. Explain how the body attempts to protect itself in these situations. [4] Hypothermia (not hyperthermia) - when body temperature drops below normal levels. The body shivers in an attempt to create more heat to stay warm. You may also notice that you have to pee when you get really cold as your body attempts to get rid of water to concentrate your blood, making it more difficult to freeze BONUS – Can an ectotherm have a fever? [1]