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Which of the following are examples of homeostatic mechanisms?

A. Increasing heart rate when blood pressure is low, Consuming excess calories to gain weight

B. Lifting weights to increase muscle mass

C. Shivering when the body temperature falls

D. Shivering when the body temperature falls, Secreting insulin to decrease blood sugar concentration, Increasing heart rate when blood pressure is low

Answer Explanation:

Homeostatic mechanisms are involuntary actions by organs, glands, tissues and cells to maintain balance within the body. For example, if a person becomes dehydrated, the kidneys will retain fluid by decreasing urine output.

Consuming excess calories and lifting weights are not involuntary actions, nor do they maintain the body in its baseline state. Rather, they are actions specifically taken to move the body away from its baseline.

Therefore, the Correct Answer is D.

Q #1: There are three Insects that are being compared under a microscope. As a scientist, you decide that measuring them would be an important part of recording their data. Which unit of measurement would best for this situation?

A. Centimeters

B. Meters

C. Micrometers

D. Kilometers

Answer Explanation

The best use of the International System of Units (SI) for this situation would be the use of the micrometer as it is the smallest unit of measurement provided and the scientist is using a microscope to view the insects.
Q #2: In general, where in the periodic table of elements are the elements with the largest atomic radii located?

A. Upper-right corner

B. Upper-left corner

C. Bottom-left corner

D. Bottom-right comer

Answer Explanation

In general, atomic radius increases moving down a group due to the increasing number of electron shells. In general, atomic radius decreases moving from left to right across a period due to the increasing number of protons in the energy level. Therefore, atoms of elements in the bottom-left corner of the periodic table tend to have the largest atomic radii.
Q #3: Which of the following statements concerning the states of matter is NOT true?

A. Plasmas are high-temperature collections of ions and free electrons.

B. Solids are the least compressible due to the more rigid positions of the particles.

C. Gases have no definite volume and expand to fill their containers

D. Liquids have no definite shape and no definite volume.

Answer Explanation

Liquids have no definite shape, but they do have a definite volume. While the particles of liquids move more freely than those in solids, they do maintain a definite volume.

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