Biology 41 Osmotic Regulation and Excretion MCQ


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Photo depicts Earth from space.
This NASA image is a composite of several satellite-based views of Earth. To make the whole-Earth image, NASA scientists combine observations of different parts of the planet. (credit: NASA/GSFC/NOAA/USGS)

Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.

Unit 7. Animal Structure and Function

Chapter 41: Osmotic Regulation and Excretion MCQ Multiple Choices Questions Quiz Test Bank

41.1 Osmoregulation and Osmotic Balance

41.2 The Kidneys and Osmoregulatory Organs

41.3 Excretion Systems

41.4 Nitrogenous Wastes

41.5 Hormonal Control of Osmoregulatory Functions

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Sample Questions from the Biology 41 Osmotic Regulation and Excretion MCQ Quiz

Question: The gland located at the top of the kidney is the ________ gland.






Question: Contractile vacuoles in microorganisms:


exclusively perform an excretory function

can perform many functions, one of which is excretion of metabolic wastes

originate from the cell membrane

both b and c

Question: Active transport of K+ in Malpighian tubules ensures that:


water follows K+ to make urine

osmotic balance is maintained between waste matter and bodily fluids

both a and b

neither a nor b

Question: The macula densa is/are:


present in the renal medulla.

dense tissue present in the outer layer of the kidney.

cells present in the DCT and collecting tubules.

present in blood capillaries.

Question: BUN is ________.


blood urea nitrogen

blood uric acid nitrogen

an indicator of blood volume

an indicator of blood pressure

Question: Human beings accumulate ________ before excreting nitrogenous waste.





uric acid

Question: When a dehydrated human patient needs to be given fluids intravenously, he or she is given:


water, which is hypotonic with respect to body fluids

saline at a concentration that is isotonic with respect to body fluids

glucose because it is a non-electrolyte


Question: The sodium ion is at the highest concentration in:


intracellular fluid

extracellular fluid

blood plasma

none of the above

Question: The osmolarity of body fluids is maintained at ________.


100 mOsm

300 mOsm

1000 mOsm

it is not constantly maintained

Question: Flame cells are primitive excretory organs found in ________.






Question: Cells in a hypertonic solution tend to:


shrink due to water loss

swell due to water gain

stay the same size due to water moving into and out of the cell at the same rate

none of the above

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