1. Which process describes the forcing of water and other small molecules from t

Question

1.

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

Select one:

a. secretion

b. absorption

c. excretion

d. filtration

2.

Connective tissue is different from the other major tissue types in that ______.

Select one:

a. it is not made up of cells

b. the cells are sparsely scattered through an extracellular matrix

c. it is found only in humans

d. it is made up of cells

3.

Use the following information to answer the following question(s).

The dune-burrowing spider Seothyra sp. lives in the Namib desert on the southwestern coast of Africa. These spiders build silk-lined burrows with a sticky silk mat at the entrance to trap insect prey. While foraging during the day, the spider remains concealed in its burrow and shielded from direct sunlight when prey are not present.

During the day, environmental temperatures vary from 17 to 73°C (63-164°F). If a spider is prevented from retreating into its burrow, it shows signs of thermal stress at 49°C, whereas unrestrained spiders continue to forage at temperatures above 65°C. In addition, spiders respond more quickly to prey stimuli during the hottest times of the day and capture prey in significantly less time when temperatures are above 49°C. The captured arthropods (prey) tend to succumb more quickly to hot surface temperatures; they are more lethargic and struggle less when captured at the high temperature ranges.


When foraging spiders are too hot, they retreat into their burrows. What type of feedback system does this indicate?

Select one:

a. negative feedback

b. positive feedback

c. positive and negative feedback

d. hormonal feedback

4.

Marine animals that have body fluids with a solute concentration equal to that of the surrounding seawater are said to be ______.

Select one:

a. hypotonic

b. osmoregulators

c. hypertonic

d. osmoconformers

5.

The vertebrate kidney helps to keep the acidity of the body fluids constant by varying the amount of hydrogen ions (H+) it secretes into the urine. You can confidently predict that this aspect of kidney function will be controlled by ______.

Select one:

a. a negative feedback mechanism

b. a hormone produced in the kidney itself

c. nerve impulses from the brain

d. a hormone produced in the brain

Explanation / Answer

1. d. Fiiteration (the glomerular capsule of the nephrons acts as high-pressure filters)

2. b. Cells are sparsely scattered through an extracellular matrix (as in blood, where the matrix is the plasma)

3. a. Negative feedback (decrease in function)

4. b. osmoregulators

5. b. a hormone produced in the kidneys.

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