Question 1

Which of the following options correctly lists the order of the four main processes that occur in the urinary system?

Accepted Answer

The correct order of processes in the urinary system is filtration (where blood plasma is filtered in the glomeruli of the kidneys), reabsorption and secretion (which occur simultaneously in the renal tubules to adjust the composition of the filtrate), and finally excretion (where the adjusted filtrate is expelled as urine).

Question 2

Emperor penguins use a huddling behavior to conduct heat efficiently. Similarly, honeybees conduct heat within their hives by huddling together and then changing positions from the center of the huddle to the edges in order to keep heat circulating. When it is warm, however, the bees transport water into their hives and then beat their wings in order to make ________ cooling possible.

Accepted Answer

Evaporative cooling is the process of reducing temperature by the evaporation of water. Honeybees use this method to cool their hives when it is warm. Convective cooling is the process of reducing temperature by air movement or circulation. While both conductive and convective may be used together in some cases, there is no indication in the passage that conductive cooling plays a role in honeybee hive temperature regulation. Isotonic refers to a solution with the same concentration of solutes as the cell, and is unrelated to cooling.

Question 3

Plants have specific temperatures (or temperature ranges) that allow for maximum growth. A process by which heat from ________ is transferred from the sun to leaves helps give plants these ideal temperatures.

Accepted Answer

Radiation is the process by which heat energy is transferred from the sun to plants through electromagnetic waves without the need for a medium. This helps plants achieve their ideal temperatures for maximum growth.

Question 4

Which arrow in this schematic view of the nephron shows reabsorption?

Accepted Answer

The answer of Which arrow in this schematic view of...

Question 5

Compared to urine, the filtrate that first enters a nephron tubule

Accepted Answer

The filtrate that first enters a nephron tubule contains more salts than urine. The process of filtration in the glomerulus filters out water and small solutes, but allows larger molecules like red blood cells and proteins to remain in the blood. Urea, a waste product of protein metabolism, is also present in the filtrate. As the filtrate travels through the nephron tubules, certain molecules and ions are reabsorbed or secreted, altering the composition of the final urine.

Question 6

Which of the following would indicate abnormally low production of ADH?

Accepted Answer

ADH (antidiuretic hormone) is responsible for regulating water balance in the body by decreasing urine output. Thus, abnormally low production of ADH can result in excessive urination. Swelling due to fluid buildup (choice A) is indicative of high levels of ADH or other factors such as heart or kidney problems. Feeling thirsty after exercising (choice C) is a normal physiological response to fluid loss during exercise and is not related to ADH production.

Question 7

When humans are cold, they often shiver. Shivering increases their ________, thereby warming their bodies.

Accepted Answer

Shivering is a physiological response that increases metabolic heat production. This increased heat production helps to warm up the body.

Question 8

Like humans, cats can experience kidney failure. Unlike humans, however, cat kidney dialysis as a treatment option is not widely available and used. Rather, efforts are made to treat any complications that arise from failing kidneys such as low potassium or high phosphate levels. When low potassium levels are identified, potassium supplements are given to return cells to a balanced potassium-water level. This is an example of an effort to maintain

Accepted Answer

Osmoregulation is the maintenance of a proper balance of water and dissolved substances in the body. In the case of low potassium levels, the body is not able to regulate this balance properly, and potassium supplements are given to help maintain osmoregulation. Thermoregulation, convection, and evaporation do not relate to the treatment of low potassium levels in cats with kidney failure.

Question 9

Cormorants are sea-dwelling birds that consume high levels of salt from the seawater they drink. To get rid of this excess salt, cormorants "sneeze" out the salt that has collected in a localized area near their sinuses. This process is an example of

Accepted Answer

Osmoregulation is the regulation of salt concentration in an organism's body fluids. In this case, cormorants are getting rid of excess salt through the process of sneezing, which helps them maintain a healthy salt concentration in their bodies. Thermoregulation is the regulation of body temperature, which is not related to the sneezing process. Conduction and radiation are processes related to heat transfer and are also not related to the sneezing process in cormorants.

Question 10

In 2011, scientists investigated whether the salts that are spread on icy roads to melt the ice are diluted enough by spring rainfall so that they do not have negative effects on amphibian species that breed in nearby areas. They exposed clutches (groups of eggs) of salamanders to three test conditions with varying salt concentrations (road salts mixed with dechlorinated tap water) to simulate salt concentrations of small pools of water located near highways that are typically fed by rain-areas where salamanders often lay their eggs. After 9 days, the scientists placed the three groups in "normal" water and measured how much body mass the salamanders lost every 3 days for 9 days. They chose to measure change in mass because salamanders are able to take in water, which helps lower the chances of salamander embryos dying from freezing, disease, or predation. The table below provides partial results of this study.
 $\begin{array}{c}
\begin{array}{|l|}
 \hline\
 \
\
\text { Group }\
 \hline1\
 \hline2\
 \hline
\end{array}
\begin{array}{lll}
 \hline\

\text {Chloride}\
\text {Concentration in}\
\text {Test Conditions}\
\hline 145 \mathrm{mg} / \mathrm{L} \
\hline945 \mathrm{mg} / \mathrm{L}\
\hline
\end{array}
\begin{array}{|l|}
\hline \text {Total \% Mass}\
\text{ Lost after 9 Days }\
\text{ of Exposure to}\
\text {Test Conditions}\
 \hline 20 \% \
 \hline35 \% \
 \hline
\end{array}
\begin{array}{l|}
\hline \text {Total \% Mass}\
  \text {Regained after 9}\
 \text { Days in Normal}\
 \text { Water Conditions }\
 \hline15 \% \
 \hline 0 \% \
 \hline

\end{array}
\begin{array}{l|}
\hline \text {Additional \%}\
 \text {Mass Lost after 9}\
 \text {Days in Nonmal}\
 \text {Water Conditions}\
\hline0 \% \
\hline10 \% \
\hline
\end{array}
\end{array}$

-This study is considering the salamander clutches' ability to maintain the process of

Accepted Answer

Osmoregulation is the process by which organisms regulate the balance of water and salts in their bodies. The study focuses on the effects of salt concentrations on salamanders and their ability to regain or lose mass in different water conditions, which directly relates to their ability to manage water and salt balance, hence osmoregulation.

Question 11

Which arrow in this figure shows heat transfer by conduction?

Accepted Answer

The answer of Which arrow in this figure shows heat...

Question 12

A woman running a marathon collapses at the finish line and is rushed to the hospital. The physicians determine that she has lost a large amount of water and salts from excessive sweating. The appropriate course of action for the physicians would be to determine the woman's intracellular fluid levels so that they can provide a fluid replacement therapy that will

Accepted Answer

The physicians would need to determine the woman's intracellular fluid levels in order to provide a fluid replacement therapy that will regain isotonic conditions of salt and water. Isotonic fluid replacement is necessary to restore the proper balance of electrolytes and water in the body's cells and tissues. Hypertonic and hypotonic solutions could cause further imbalances and potentially harm the patient. Providing a measure of metabolic heat production would not address the immediate concern of fluid and electrolyte loss.

Question 13

Most fishes can either live in freshwater or live in saltwater habitats, but not in both. If you move a marine fish from the ocean to a lake, it will quickly die, and vice versa. However, a small number of fish species are capable of moving between the two environments. Salmon are osmoregulators that hatch in rivers, spend most of their lives in the ocean, and return to the river where they were born in order to breed.
-When a salmon moves from the ocean to a freshwater environment, you would expect its urine volume to ________ and its rate of salt absorption to ________.

Accepted Answer

When salmon move from saltwater to freshwater, they produce more urine to expel excess water and increase salt absorption to maintain their internal salt balance.

Question 14

If valuable solutes were not adequately reabsorbed from filtrate, what would occur?

Accepted Answer

If valuable solutes (such as glucose, amino acids, and ions) were not adequately reabsorbed from filtrate, they would be excreted and lost from the body, leading to a potential loss of nutrients or an alteration in fluid and electrolyte balance. This can happen in cases of kidney damage or disease, where the ability of the nephron to reabsorb solutes is decreased.

Question 15

The following questions relate to the three figures above, which indicate how the tubules in the kidney respond to the administration of the hormone vasopressin (AVP).   
-The density of the aquaporins in the presence of vasopressin was approximately

Accepted Answer

The answer of The following questions relate to the three...

Question 16

The nitrogenous waste product in bears (mammals) is ________, while most saltwater fish get rid of wastes through ________.

Accepted Answer

Bears, as mammals, primarily excrete urea, a less toxic form of nitrogenous waste that allows them to conserve water. Most saltwater fish excrete ammonia directly into the water, where it is diluted.

Question 17

The following questions relate to the three figures above, which indicate how the tubules in the kidney respond to the administration of the hormone vasopressin (AVP).   
-The hypothesis that scientists who collected these data were most likely testing is that

Accepted Answer

The hypothesis most likely being tested is that the permeability change in the collecting tubules is linked to the number of aquaporins, as aquaporins are proteins that facilitate water transport across cell membranes, and their presence or absence would directly affect the permeability of the tubules to water.

Question 18

Which part of the nephron shown is its proximal tubule?

Accepted Answer

The proximal tubule is located immediately after the Bowman's capsule, and it is characterized by the presence of brush border on its cells. Part B in the image shows this characteristic brush border, indicating that it is the proximal tubule.

Question 19

Most fishes can either live in freshwater or live in saltwater habitats, but not in both. If you move a marine fish from the ocean to a lake, it will quickly die, and vice versa. However, a small number of fish species are capable of moving between the two environments. Salmon are osmoregulators that hatch in rivers, spend most of their lives in the ocean, and return to the river where they were born in order to breed.
-When a salmon leaves the river and moves out to sea, you would expect ________ to leave its body by osmosis and that excess ________ would need to be pumped out.

Accepted Answer

When a salmon moves from a freshwater environment to the ocean (a saltwater environment), water would tend to leave its body by osmosis due to the higher salinity outside its body. To maintain its internal salt balance, the salmon would need to actively pump out excess salt that it accumulates.

Question 20

A logical treatment plan for patients with high ADH levels would include

Accepted Answer

ADH (antidiuretic hormone) helps the kidneys retain water. In patients with high ADH levels, more fluids are needed to prevent dehydration.

Quiz 25: Control of Body Temperature and Water Balance