Q: Which of the following equations correctly calculates Mean Arterial Pressure (MAP) given a systolic blood pressure of 120 mmHg and a diastolic blood pressure of 80 mmHg?

MAP = $$\frac{1}{3} (\text{Systolic} - \text{Diastolic}) + \text{Diastolic}$$; MAP = $$\frac{1}{3} (120 - 80) + 80 = 93.3$$ mmHg

Question 1

Which of the following best describes the function of a buffer system in the human body?

Accepted Answer

Buffers maintain a constant pH by neutralizing strong acids and bases through reversible chemical reactions.

Question 2

A patient is found to have a blood pH of 7.25. Which of the following equations correctly relates pH to hydrogen ion concentration, and what does this value indicate?

Accepted Answer

pH = $$-\log [H^+]$$; this value indicates acidosis.

Question 3

Which of the following is TRUE regarding the pathway of blood through the heart?

Accepted Answer

Blood enters the right atrium from the superior and inferior vena cava, passes through the tricuspid valve to the right ventricle, then through the pulmonary semilunar valve to the pulmonary trunk.

Question 4

During a blood typing experiment, agglutination occurs in the wells containing anti-A and anti-Rh serum, but not in the anti-B well. What is the blood type of the sample?

Accepted Answer

A positive (A+)

Question 5

Which of the following equations correctly calculates Mean Arterial Pressure (MAP) given a systolic blood pressure of 120 mmHg and a diastolic blood pressure of 80 mmHg?

Accepted Answer

MAP = $$\frac{1}{3} (	ext{Systolic} - 	ext{Diastolic}) + 	ext{Diastolic}$$; MAP = $$\frac{1}{3} (120 - 80) + 80 = 93.3$$ mmHg

Question 6

Which of the following best explains why the left ventricle of the heart has a thicker myocardium than the right ventricle?

Accepted Answer

The left ventricle pumps blood into the systemic circulation, which requires higher pressure to deliver blood throughout the body.

Question 7

A patient with heart failure is likely to experience changes in respiratory rate. Which of the following best explains why?

Accepted Answer

Heart failure reduces cardiac output, leading to decreased oxygen delivery and increased carbon dioxide, which stimulates increased respiratory rate.

Question 8

Which of the following is a correct sequence for the pathway of filtrate through the nephron?

Accepted Answer

Glomerular capsule → Proximal convoluted tubule → Loop of Henle → Distal convoluted tubule → Collecting duct

Question 9

Which of the following is a normal constituent of urine, and why should it be present?

Accepted Answer

Urea, because it is a waste product of protein metabolism that is filtered by the kidneys.

Question 10

Which of the following best describes the effect of breathing into a paper bag for someone who is hyperventilating?

Accepted Answer

It increases the concentration of CO$$_2 in $$the blood, helping to restore normal pH by reducing alkalosis.

Question 11

Which of the following equations correctly represents the reaction of a phosphate buffer when a strong acid is added?

Accepted Answer

$$H^+ + Na_2HPO_4 \rightarrow NaH_2PO_4 + Na^+$$

Question 12

Which of the following best explains why the right lung is larger than the left lung?

Accepted Answer

The left lung is smaller to accommodate the space taken up by the heart.

Question 13

Which of the following best describes the structural difference between arteries and veins?

Accepted Answer

Arteries have thicker tunica media and smaller lumens compared to veins, which have thinner walls and larger lumens.

Question 14

Which of the following is the correct equation for calculating cardiac output (CO)?

Accepted Answer

CO = $$	ext{Stroke Volume} 	imes 	ext{Heart Rate}$$

Question 15

Which of the following best explains the role of surfactant released by Type II alveolar cells?

Accepted Answer

Surfactant reduces surface tension in the alveoli, preventing collapse and making breathing easier.

Question 16

Which of the following best describes the effect of increased surface area on digestion, as demonstrated in the potato experiment?

Accepted Answer

Increased surface area allows more enzyme-substrate interaction, resulting in greater digestion.

Question 17

Which of the following is TRUE regarding the function of the hepatic portal system?

Accepted Answer

It transports nutrient-rich blood from the digestive organs to the liver for processing before entering systemic circulation.

Question 18

Which of the following best describes the structural and functional difference between cortical and juxtamedullary nephrons?

Accepted Answer

Juxtamedullary nephrons have longer loops of Henle that extend deep into the medulla, allowing for greater concentration of urine.

Anatomy and Physiology II: Comprehensive Study Guide (Cardiovascular, Respiratory, Digestive, Urinary, Reproductive, and Buffer Systems)

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