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Chapter 46: Problem 10

Unique to endotherms is: a.torpor. b. thermal acclimatization. c. a non changing body temperature. d. response to seasonal temperature changes. e. thermoregulation by a hypothalamus.

Short Answer

Expert verified
e. thermoregulation by a hypothalamus

Step by step solution

01

Examine the Options

Each option suggests a different characteristic related to temperature regulation. It's important to understand what each of these terms means. Torpor is a state of reduced metabolic activity, thermal acclimatization is the ability to adjust to changes in environmental temperature, a non changing body temperature implies homeostasis, response to seasonal temperature changes means adjusting to changes in temperature throughout the year, and thermoregulation by a hypothalamus suggests the hypothalamus has a role in maintaining body temperature.
02

Apply Knowledge of Endotherms

Endotherms are organisms that maintain a constant body temperature regardless of environmental conditions. They achieve this through internal heat production and mechanisms of heat retention.
03

Identify the Unique Characteristic

Of all options, thermoregulation by a hypothalamus characterizes endotherm behavior. While torpor and thermal acclimatization are exhibited by both endotherms and ectotherms, maintaining a constant body temperature and responding to seasonal temperature changes can also be seen in some ectotherms to a limited extent. Thermoregulation by a hypothalamus, however, is a process unique to endotherms.

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Most popular questions from this chapter

Products of metabolism in humans, as in: a. terrestrial amphibians, can include urea, which requires more energy to produce than ammonia. b. birds and reptiles, can include uric acid, which is nontoxic and excreted as a paste. c. sharks, are primarily excreted as ammonia. d. hydra, must be isoosmotic with the water ingested. e. other mammals, cannot be water as water comes only from what they drink.

Which of the following statements about osmoregulation is true? a. In freshwater invertebrates, salts move out of the body into the water because the animal is hypoosmotic to the water. b. A marine teleost has to fight gaining water because it is isoosmotic to the sea. Most land animals are osmoconformers. d. Vertebrates are usually osmoregulators. Terrestrial animals can regulate their osmolarity without expending energy.

Which of the following is an example of autoregulation of kidney function? a. The RAAS regulates Na " by secreting renin when blood pressure or blood volume decreases. b. The ADH system regulates water balance by decreasing water reabsorption and increasing excretion of salt. c. Receptors in the juxtaglomerular apparatus of the distal convoluted tubule detect drops in blood pressure and cause a higher filtration rate. d. ANF is released by the kidney to increase renin release. e. Angiotensin lowers blood pressure by constricting arterioles.

Which of the following correctly describes a part of kidney function? a. Collecting ducts dilute urine because they are permeable to salt but not water. b. In the ascending loop of Henle, \(\mathrm{Na}^{+}\) and \(\mathrm{Cl}^{-}\) move into the tubules because the osmolarity of the filtrate is increased. c. The descending loop of Henle receives filtrate from the ascending loop. d. The distal convoluted tubule pumps water into the tubule by active transport. The renal pelvis receives urine from the collecting ducts and carries it to the ureters.

Deficient water levels in humans are prevented by: a. osmoreceptors on the hypothalamus that detect decreases in salt concentrations. b. the hypothalamus stimulating the posterior pituitary to secrete a hormone that allows the collecting ducts and distal convoluted tubules to be permeable to water. c. inhibiting ADH, which causes a rise in osmolarity of ex. tracellular fluids. d. producing dilute urine. e. drinking alcohol, which stimulates aldosterone to raise the osmolarity of body fluids.
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