Question 1

Which of the following best describes the primary function of erythrocytes in the human body?

Accepted Answer

They transport oxygen from the lungs to body tissues and facilitate carbon dioxide removal.

Question 2

A patient presents with a low platelet count. Which physiological process is most likely to be impaired?

Accepted Answer

Blood clot formation (hemostasis)

Question 3

A blood sample is analyzed and found to have a hematocrit of 60%. Which of the following conditions is most consistent with this finding?

Accepted Answer

Polycythemia

Question 4

Which equation correctly represents the relationship between blood flow ($$Q$$), pressure difference ($$\Delta P$$), and resistance ($$R) in a $$blood vessel?

Accepted Answer

$$Q = \frac{\Delta P}{R}$$

Question 5

A patient is experiencing tachycardia (increased heart rate) due to sympathetic nervous system activation. Which of the following best explains the physiological mechanism?

Accepted Answer

Release of norepinephrine, which increases the rate of depolarization at the SA node

Question 6

During a routine blood test, a patient's blood type is determined to be AB+. Which of the following statements is correct regarding this blood type?

Accepted Answer

The patient can receive blood from any ABO and Rh blood type.

Question 7

Which of the following best describes the role of the lymphatic system in maintaining fluid balance in the body?

Accepted Answer

It returns excess interstitial fluid to the bloodstream.

Question 8

A patient with a blocked thoracic duct would most likely experience which of the following symptoms?

Accepted Answer

Edema in the lower limbs due to impaired lymphatic drainage

Question 9

Which of the following best explains why capillaries are the primary site of exchange between blood and tissues?

Accepted Answer

They have thin walls and a large surface area, allowing efficient diffusion.

Question 10

A patient is diagnosed with anemia due to iron deficiency. Which of the following laboratory findings would you expect?

Accepted Answer

Decreased hemoglobin concentration

Question 11

Which of the following best describes the Frank-Starling law of the heart?

Accepted Answer

The greater the end-diastolic volume, the greater the force of contraction.

Question 12

A patient is found to have a high white blood cell count. Which of the following is the most likely explanation?

Accepted Answer

The patient is experiencing an immune response to infection.

Question 13

Which of the following best describes the function of the AV (atrioventricular) node in the cardiac conduction system?

Accepted Answer

It delays the electrical impulse, allowing the atria to contract before the ventricles.

Question 14

A patient is experiencing shortness of breath and has a low partial pressure of oxygen in arterial blood ($$PaO_2). $$Which of the following is the most likely cause?

Accepted Answer

Impaired gas exchange at the alveolar-capillary membrane

Question 15

Which of the following best explains the effect of increased sympathetic nervous system activity on blood pressure?

Accepted Answer

It causes vasoconstriction and increases cardiac output.

Question 16

A patient is given a drug that blocks calcium channels in cardiac muscle cells. Which of the following effects would you expect?

Accepted Answer

Decreased force of cardiac contraction

Question 17

Which of the following equations correctly represents cardiac output ($$CO$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 18

A patient with a deficiency in helper T cells would most likely have which of the following problems?

Accepted Answer

Reduced ability to mount an effective immune response

Question 19

Which of the following best describes the process of hemostasis?

Accepted Answer

The process by which bleeding is stopped through vascular spasm, platelet plug formation, and coagulation

Question 20

A patient is found to have a mutation that prevents the production of functional fibrinogen. Which step of hemostasis would be most directly affected?

Accepted Answer

Coagulation (formation of a stable blood clot)

Human Anatomy & Physiology II: Course Overview and Key Concepts

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