Chapter 20. 20·9–20·13 How does homeostasis work?

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You must read each slide, and complete any questions on the slide, in sequence.

Instructions

Check your understanding of concepts from 20·9–20·13 How does homeostasis work? by answering the following questions.

1.

1. “The optimal state that a body should be in” is a definition of which physiological concept?

optimized status quo

set point

ideal corporeal state

comfort state

default physiological status

Correct. (See section 20·9 Negative and positive feedback systems influence homeostasis.)

Incorrect. (See section 20·9 Negative and positive feedback systems influence homeostasis.)

2.

2. Ectotherms are BEST defined as:

animals that rely primarily on external sources of energy for regulating body temperature.

animals that don’t regulate their body temperature.

animals that rely on internal sources of energy as well as metabolic energy to maintain a relatively constant body temperature.

animals that rely on metabolic energy to maintain a relatively constant body temperature.

animals that rely primarily on internal sources of energy for regulating body temperature.

Correct. (See section 20·10 Temperature control is a component of homeostasis.)

Incorrect. (See section 20·10 Temperature control is a component of homeostasis.)

3.

3. Terrestrial plants and animals regulate their internal water by balancing _____________ against ___________.

water pH; water temperature

water temperature; water loss

water intake; water temperature

cellular temperature; water temperature

water intake; water loss

Correct. (See section 20·12 Animals must balance their water content within a narrow range.)

Incorrect. (See section 20·12 Animals must balance their water content within a narrow range.)

4.

4. Each mammalian kidney filters blood, processes the filtrate in urine, and releases that urine into a duct called the ____________, which leads to the ___________________, where the urine is stored until it is excreted through the ______________.

urethra; nephron; ureter

nephron; urinary bladder; ureter

nephron; urinary bladder; urethra

urethra; urinary bladder; ureter

ureter; urinary bladder; urethra

Correct. (See section 20·13 In humans, the kidneys regulate water balance.)

Incorrect. (See section 20·13 In humans, the kidneys regulate water balance.)

5.

5. What is meant when a regulatory system is said to have “positive” feedback?

The system gets all of its heat from the external environment.

The effectors reverse or decrease a change in the system.

The effectors cool the organism’s body so that it doesn’t get hyperthermia.

The effectors slow down or decrease a change in the system.

None of the above answers is correct.

Correct. (See section 20·9 Negative and positive feedback systems influence homeostasis.)

Incorrect. (See section 20·9 Negative and positive feedback systems influence homeostasis.)

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