Question 1

Which of the following best describes the main difference between positive and negative feedback mechanisms in homeostasis?

Accepted Answer

Negative feedback opposes the original stimulus, while positive feedback amplifies it.

Question 2

Which of the following is most abundant in the intracellular fluid compartment?

Accepted Answer

Potassium ions ($$\mathrm{K^+})$$

Question 3

A patient is exposed to a toxin that inhibits the sodium-potassium pump. Which of the following would most likely occur?

Accepted Answer

The cell would accumulate more $$\mathrm{Na^+}$$ inside and lose $$\mathrm{K^+} to $$the outside.

Question 4

Which of the following best describes the role of the carbonic acid/bicarbonate buffer system in blood?

Accepted Answer

It helps regulate blood pH by neutralizing excess acids or bases.

Question 5

Which of the following is a characteristic of covalent bonds?

Accepted Answer

They involve the sharing of electrons between atoms.

Question 6

A red blood cell is placed in a hypotonic solution. What will most likely happen to the cell?

Accepted Answer

It will swell and possibly burst due to water gain.

Question 7

Which of the following best describes the function of melanocytes in the skin?

Accepted Answer

They produce melanin to protect against UV radiation.

Question 8

Which of the following is a function of the acid mantle on the skin?

Accepted Answer

It creates a slightly acidic environment that inhibits microbial growth.

Question 9

Which of the following best describes the process of transcription?

Accepted Answer

The synthesis of mRNA from a DNA template.

Question 10

Which of the following cell junctions allows for the direct passage of ions and small molecules between adjacent cells?

Accepted Answer

Gap junctions

Question 11

A patient with severe burns covering 36% of their body surface area is at risk for which of the following complications?

Accepted Answer

Increased risk of dehydration due to loss of the skin barrier.

Question 12

Which of the following best describes the function of the sodium-potassium pump ($$\mathrm{Na^+/K^+}$$ ATPase) in cells?

Accepted Answer

It moves $$\mathrm{Na^+}$$ out of the cell and $$\mathrm{K^+}$$ into the cell against their concentration gradients.

Question 13

Which of the following is a function of fibroblasts in the dermis?

Accepted Answer

Synthesizing collagen and extracellular matrix components

Question 14

Which of the following best describes the role of hydrogen bonds in water?

Accepted Answer

They give water a high specific heat and surface tension.

Question 15

Which of the following is true regarding isotopes?

Accepted Answer

They have the same number of protons but different numbers of neutrons.

Question 16

Which of the following best describes the function of keratinocytes in the epidermis?

Accepted Answer

They form a barrier against environmental damage.

Question 17

Which of the following is a characteristic of primary active transport?

Accepted Answer

It requires ATP to move substances against their concentration gradient.

Question 18

Which of the following best describes the function of the dermal papillae?

Accepted Answer

They increase the surface area for attachment between the epidermis and dermis.

Question 19

Which of the following is a correct pairing of a nucleotide base and its complementary base in DNA?

Accepted Answer

Adenine ($$A) $$pairs with Thymine ($$T)$$

Question 20

Which of the following is a function of the hypodermis?

Accepted Answer

Providing insulation and energy storage

Anatomy & Physiology Exam 1 Study Guide: Basic Concepts, Chemistry, Cells, and Integument

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