Question 1

Which of the following best describes the concept of homeostasis as discussed in Anatomy & Physiology II?

Accepted Answer

Homeostasis is the ability of the body to maintain a stable internal environment by regulating physiological processes in response to external and internal changes.

Question 2

A patient presents with symptoms of dehydration. Which feedback mechanism is most likely activated to restore fluid balance?

Accepted Answer

Negative feedback mechanism involving antidiuretic hormone (ADH) release.

Question 3

Which equation best represents the relationship between acid-base balance and hydrogen ion concentration in the blood?

Accepted Answer

$pH = -\log_{10}[H^+]$

Question 4

Which of the following scenarios best illustrates the principle of structure-function relationship in physiology?

Accepted Answer

The thin walls of alveoli in the lungs facilitate rapid gas exchange.

Question 5

A patient with uncontrolled diabetes mellitus is experiencing metabolic acidosis. Which physiological process is most directly affected?

Accepted Answer

Acid-base balance due to increased production of ketone bodies.

Question 6

Which of the following is an example of a positive feedback loop in human physiology?

Accepted Answer

Release of oxytocin during childbirth to intensify uterine contractions.

Question 7

If a patient loses 2 liters of blood, which compensatory mechanism will most likely be activated to maintain homeostasis?

Accepted Answer

Increased secretion of erythropoietin to stimulate red blood cell production.

Question 8

Which formula is used to calculate the osmolarity of a solution, relevant to fluid and electrolyte balance?

Accepted Answer

$Osmolarity = \sum_{i} c_i$

Question 9

Which of the following best explains how gradients drive physiological processes?

Accepted Answer

Gradients create differences in concentration, pressure, or electrical charge that drive passive movement of substances across membranes.

Question 10

A patient is experiencing respiratory alkalosis. Which compensatory response would you expect from the kidneys?

Accepted Answer

Decrease reabsorption of bicarbonate ions.

Question 11

Which of the following is a direct consequence of failing to maintain electrolyte balance in the body?

Accepted Answer

Impaired nerve and muscle function due to altered membrane potentials.

Question 12

Which equation describes the relationship between cardiac output, heart rate, and stroke volume?

Accepted Answer

$CO = HR 	imes SV$

Question 13

A patient with chronic kidney disease is unable to excrete excess potassium. What is the most likely physiological consequence?

Accepted Answer

Hyperkalemia leading to cardiac arrhythmias.

Question 14

Which of the following best describes the role of the endocrine system in maintaining homeostasis?

Accepted Answer

The endocrine system releases hormones that regulate physiological processes and maintain internal balance.

Question 15

Which feedback loop is most likely involved in the regulation of blood glucose after a meal?

Accepted Answer

Negative feedback loop involving insulin secretion.

Question 16

A patient is admitted with severe vomiting and diarrhea. Which physiological process is most at risk?

Accepted Answer

Fluid and electrolyte balance due to excessive loss of sodium and potassium.

Question 17

Which equation is used to calculate the glomerular filtration rate (GFR) in the kidneys?

Accepted Answer

$GFR = K_f 	imes [(P_{GC} - P_{BS}) - (\pi_{GC} - \pi_{BS})]$

Question 18

Which of the following best explains why feedback loops are essential for maintaining homeostasis?

Accepted Answer

Feedback loops enable the body to detect deviations from set points and initiate corrective responses.

Question 19

A patient with Addison's disease has decreased aldosterone production. What is the most likely effect on fluid and electrolyte balance?

Accepted Answer

Decreased sodium reabsorption and increased potassium retention.

BIO 169 Anatomy and Physiology II: Course Overview and Study Guide

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