Question 1

The figure below shows that ________.

Accepted Answer

The figure shows a feedback loop indicating the process of homeostasis in cats. Homeostatic mechanisms enable the cats to maintain relatively constant internal conditions, such as body temperature and water balance, even when the external environment changes. Therefore, option D is the correct choice. Option A and B are not related to the given figure, and option C is incorrect because cats do experience variations in their internal conditions.

Question 2

Reabsorption is the movement of substances from the ________ to the ________.

Accepted Answer

Reabsorption occurs in the nephron, which filters substances from the blood into the filtrate. The substances that need to be retained, such as water and nutrients, are then reabsorbed from the filtrate back into the blood for circulation throughout the body. Therefore, reabsorption is the movement of substances from the filtrate back into the blood.

Question 3

Excretion is the movement of substances from the ________ to the ________.

Accepted Answer

Excretion involves the removal of waste products and excessive substances from the body. The kidneys are responsible for filtering the blood and excreting waste products in the form of urine, which is then transported to the outside of the body through the ureters, bladder, and urethra. Therefore, the movement of substances is from the kidneys to the outside of the body.

Question 4

Which of the following is most likely to be responsible if,when your blood sugar level rose,the level went back down?

Accepted Answer

Homeostatic mechanisms based on negative feedback are responsible for maintaining stable internal conditions in the body, including blood sugar levels. In the case of blood sugar levels rising, negative feedback mechanisms would cause insulin to be released, which would help cells take up glucose from the blood, leading to a decrease in blood sugar levels.

Question 5

When body temperature is too low,which of the following occurs?

Accepted Answer

When body temperature is too low, blood vessels in the skin constrict (get smaller) to reduce blood flow near the surface and conserve heat. This helps to maintain a warmer core temperature. Choices B and C are incorrect because they are not related to regulating body temperature when it is too low. Choice D is incorrect because dilating (expanding) blood vessels would actually increase blood flow near the skin surface, leading to heat loss.

Question 6

Which of the following animals is generating (producing)body heat to warm itself?

Accepted Answer

A moth that shivers its wings before flight is generating body heat to warm itself.

Question 7

Most homeostatic mechanisms depend on ________.

Accepted Answer

Homeostatic mechanisms rely on negative feedback, which is a regulatory process that cancels out any deviations from a set point in order to maintain stability within an organism's internal environment. Positive feedback mechanisms can cause destabilization rather than stability, predictable environmental conditions are not always present, and predictable internal conditions do not necessarily regulate homeostasis.

Question 8

In humans,goosebumps are a vestige of a mammalian adaptation related to ________.

Accepted Answer

Goosebumps are caused by the contraction of small muscles attached to hair follicles, which elevates the hair and creates small bumps on the skin. In mammals, this is a response to cold temperatures or emotional arousal, and helps to trap a layer of insulating air close to the skin, thus aiding in thermoregulation. However, in humans, goosebumps do not serve a significant thermoregulatory function due to our reduced body hair, and are instead a vestigial feature.

Question 9

Which of the following is a physiological response that takes place in many animals when they get too hot?

Accepted Answer

When animals get too hot, they often increase blood flow to the skin in order to dissipate heat through sweating or panting. This helps to cool the body down and prevent overheating. Slowing of the heart rate and constriction of blood vessels in the skin would actually work against this mechanism, while contraction of muscles may help to generate heat, but would not necessarily help to cool the body down.

Question 10

One function of this organ system is ________.

Accepted Answer

The organ system referred to in the given code is not mentioned, however, since the excretion of urea is a function of the urinary system, and all other options listed do not match with any other system, option A is the most suitable answer.

Question 11

A diuretic is a substance that ________.

Accepted Answer

A diuretic is a substance that promotes urinary water loss, meaning it increases the production of urine and reduces water retention in the body. Diuretics are often used to treat conditions such as hypertension, heart failure, and edema.

Question 12

Examine the figure above that shows negative feedback in a thermostat.If the room becomes too warm,the next thing that will occur is ________.

Accepted Answer

The answer of Examine the figure above that shows negative...

Question 13

Which of the following is a source of water loss in humans? I)urination
II)defecation
III)breathing

Accepted Answer

All three options result in water loss in humans. Urination and defecation both involve the elimination of waste products along with water, while breathing results in water vapor being expelled through the lungs. Therefore, the correct answer is D, all three options - I, II, and III - result in water loss in humans.

Question 14

Which of the following is a function of the kidneys? I)elimination of urea
II)reabsorption of valuable solutes
III)reabsorbing water

Accepted Answer

The kidneys perform all three functions listed: eliminating urea as a waste product, reabsorbing valuable solutes (such as glucose and electrolytes) to be returned to the bloodstream, and reabsorbing water to maintain proper hydration levels in the body.

Question 15

Which of the following animals is an ectotherm?

Accepted Answer

An ectotherm is an animal that regulates its body temperature through external factors, such as the sun or water temperature. Of the given options, only the spiny lobster fits this description as it is a crustacean that lives in water and regulates its body temperature through the surrounding water. The other options, humans, parrots, and field mice, are endotherms, meaning they regulate their body temperature through internal processes such as metabolism.

Question 16

Secretion is the movement of substances from the ________ to the ________.

Accepted Answer

The answer of Secretion is the movement of substances from...

Question 17

Which of the following statements apply to freshwater fish?

Accepted Answer

The answer of Which of the following statements apply to...

Question 18

Compare how temperature is regulated in a room with a thermostat with how thermoregulation works in the human body.What is most analogous to "Heating starts" (i.e.,heat is produced)for the human body?

Accepted Answer

In a room with a thermostat, the heating starts when the temperature drops below the desired level and the thermostat sends a signal to the heating system to produce more heat. Similarly, in the human body, when the body temperature drops below the desired level, the metabolic rate increases to produce more heat. This is the most analogous to "heating starts" in a room with a thermostat. Blood vessels constricting near the surface, putting on more clothes, and producing sweat are all mechanisms to regulate body temperature but not directly related to "heating starts" in the same way as metabolic rate increase.

Question 19

One function of this organ system is ________.

Accepted Answer

The given organ system is the respiratory system, and one of its primary functions is the exchange of gases between the blood and air, which occurs in the lungs.

Question 20

Which process describes the forcing of water and other small molecules from the blood into a kidney tubule?

Accepted Answer

Filtration is the process in which water and small molecules are forced from the blood into the kidney tubules. Absorption refers to the movement of substances from the tubules back into the blood, while secretion is the movement of substances from the blood into the tubules. Excretion is the final elimination of substances from the body.

Quiz 21: Unifying Concepts of Animal Structure and Function

The figure below shows that ________.

Reabsorption is the movement of substances from the to the .

Excretion is the movement of substances from the to the .

Which of the following is most likely to be responsible if,when your blood sugar level rose,the level went back down?

When body temperature is too low,which of the following occurs?

Which of the following animals is generating (producing) body heat to warm itself?

Most homeostatic mechanisms depend on ________.

In humans,goosebumps are a vestige of a mammalian adaptation related to ________.

Which of the following is a physiological response that takes place in many animals when they get too hot?

One function of this organ system is ________.

A diuretic is a substance that ________.

Examine the figure above that shows negative feedback in a thermostat.If the room becomes too warm,the next thing that will occur is ________.

Which of the following is a source of water loss in humans? I) urination II) defecation III) breathing

Which of the following is a function of the kidneys? I) elimination of urea II) reabsorption of valuable solutes III) reabsorbing water

Which of the following animals is an ectotherm?

Secretion is the movement of substances from the to the .

Which of the following statements apply to freshwater fish?

Compare how temperature is regulated in a room with a thermostat with how thermoregulation works in the human body.What is most analogous to "Heating starts" (i.e.,heat is produced) for the human body?

One function of this organ system is ________.

Which process describes the forcing of water and other small molecules from the blood into a kidney tubule?