Question 1

Which of the following best describes the difference between anatomy and physiology?

Accepted Answer

Anatomy studies the structure of body parts, while physiology studies the function of those parts.

Question 2

Arrange the following levels of organization in the correct order from simplest to most complex: tissue, organ, cell, organ system, molecule.

Accepted Answer

Molecule, cell, tissue, organ, organ system

Question 3

Which of the following is an example of an emergent property in human biology?

Accepted Answer

The ability of the heart to pump blood, which arises from the coordinated action of cardiac cells.

Question 4

How might social factors such as chronic stress influence human physiology?

Accepted Answer

Chronic stress can increase cortisol levels, which may suppress immune function and elevate blood pressure.

Question 5

According to the vitamin D-folate hypothesis, why might skin pigmentation have evolved differently in various human populations?

Accepted Answer

To balance the need for vitamin D synthesis with the protection of folate from UV radiation.

Question 6

Which of the following best explains why B vitamins are essential in the human body?

Accepted Answer

They act as coenzymes in metabolic reactions, such as cellular respiration.

Question 7

Which of the following statements about ions and electrolytes is correct?

Accepted Answer

An electrolyte is a substance that dissociates into ions in water and can conduct electricity.

Question 8

In the context of physiology, which type of bond readily dissociates in water and why is this important?

Accepted Answer

Ionic bonds, because the charged ions interact with water molecules, allowing for electrical signaling in the body.

Question 9

Which of the following ions is most critical for generating action potentials in neurons?

Accepted Answer

Sodium ion ($$\mathrm{Na^+})$$

Question 10

What is the main difference between a sodium atom ($$\mathrm{Na}) $$and a sodium ion ($$\mathrm{Na^+}$$)?

Accepted Answer

A sodium ion ($$\mathrm{Na^+}) $$has lost one electron compared to a sodium atom ($$\mathrm{Na}).$$

Question 11

Which of the following best defines 'flux' in the context of physiology?

Accepted Answer

The rate at which a substance moves across a membrane, often described by $$J = -D \frac{dC}{dx}.$$

Question 12

A patient presents with muscle cramps and irregular heartbeat. Blood tests reveal low potassium ion ($$\mathrm{K^+}) $$levels. Which physiological process is most likely impaired?

Accepted Answer

Resting membrane potential maintenance in muscle and nerve cells.

Question 13

Which of the following is a correct statement about anions and cations?

Accepted Answer

An anion is negatively charged, while a cation is positively charged.

Question 14

If a cell is placed in a solution with a high concentration of sodium ions ($$\mathrm{Na^+}$$), what will happen to the flux of sodium across the cell membrane?

Accepted Answer

Sodium will tend to move into the cell down its concentration gradient, increasing inward flux.

Question 15

Which of the following best describes the role of calcium ions ($$\mathrm{Ca$$^{2+}$$}) in $$human physiology?

Accepted Answer

They are essential for muscle contraction and neurotransmitter release.

Question 16

A person with a genetic mutation that reduces melanin production is at increased risk for which of the following, according to the vitamin D-folate hypothesis?

Accepted Answer

Folate degradation due to increased UV exposure.

Question 17

Which of the following is NOT a function of electrolytes in the human body?

Accepted Answer

Serving as coenzymes in metabolic reactions.

Question 18

A medical test shows that Eugene has abnormally high levels of chloride ions ($$\mathrm{Cl^-}) in $$his blood. Which of the following could this indicate?

Accepted Answer

Possible dehydration or kidney dysfunction affecting electrolyte balance.

Question 19

Which of the following best explains why ionic compounds like sodium chloride ($$\mathrm{NaCl}) $$are considered electrolytes?

Accepted Answer

They dissociate into ions in water, allowing the solution to conduct electricity.

Question 20

Which of the following statements about race is supported by current scientific understanding?

Accepted Answer

Race is primarily a social construct with little genetic basis.

Fundamental Concepts in Anatomy & Physiology: Exam Guide Study Notes

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