39. To maintain homeostasis freshwater fish must A) excrete large quantities of

Question

39. To maintain homeostasis freshwater fish must A) excrete large quantities of water B) take in electrolytes through simple diffusion C) excrete large quantities of electrolytes D) consume large quantities of water 40. Blood is located in the lumen (space) of each of the following structures. Select the one that has the highest level of dissolved oxygen? A) Right ventricle B) Pulmonary veins C) Right atrium D) Pulmonary arteries 41. You learned from lecture and from an NPR interview with UCSF scientist John Clements that some human infants, especially those born prematurely, suffer serious respiratory failure because of inadequate production of surfactants. What is the function of surfactants in the alveoli? A) They prevent the collapse of the alveoli by means of increasing the surface tension B) They prevent the collapse of the alveoli by means of reducing the surface tension C) They help directly with CO2 and O2 exchange. D) They prevent the alveoli collapse by regulating osmolarity. 42. The force driving simple diffusion is while the energy source for active transport is A) the concentration gradient, ATP B) the concentration gradient, ADP C) phosphorylated protein carriers, ATP D) transmembrane pumps; electron transport 43. The osmoregulatory process called secretion refers to the A) expulsion of urine from the body B) formation of an osmotic gradient along an excretory structure C) reabsorption of nutrients from a filtrate D) selective elimination of excess ions and toxins from body fluids 44. (1 pt) When the air in a testing chamber is specially mixed so that its oxygen content is 10 percent and its overall air pressure is 400 mm Hg, then Poz is A) 40 mm Hg B) 400 mm Hg C) 4 mm Hg D) 82 mm Hg 45. Damage to the sinoatrial node in humans A) would block conductance between the bundle branches and the Purkinje fibers B) would have a direct effect on blood pressure monitors in the aorta C) would disrupt the rate and timing of cardiac muscle contractions D) would have a negative effect on peripheral resistance 46. Circulatory systems compensate for A) the problem of communication systems involving only the nervous system B) temperature differences between the lungs and the active tissue C) the need to cushion animals from trauma D) the slow rate at which diffusion occurs over large distances 47. Atria contract A) immediately after ventricular systole B) just prior to the beginning of ventricular diastole C) during ventricular diastole D) during ventricular systole

Explanation / Answer

39. To maintain homeostasis, freshwater fish must: - excrete large quantities of water.

Explanation: - This is so because freshwater fishes are hypertonic compared to their environment. This means that these fishes contain more solute and less solvent. So, in freshwater, large amount of water moves into their body cells via diffusion and osmosis. So, they need to excrete more water to maintain homeostasis in their body.

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