Question 1

Which of the following best explains why veins contain valves, while arteries generally do not?

Accepted Answer

Valves in veins prevent the backflow of blood due to lower pressure and help return blood to the heart against gravity.

Question 2

A patient is experiencing edema (swelling) in their lower limbs. Which imbalance between hydrostatic and osmotic pressures at the capillary level most likely explains this condition?

Accepted Answer

Increased hydrostatic pressure and decreased osmotic pressure, leading to more fluid leaving capillaries and less being reabsorbed.

Question 3

Which of the following best describes the effect of vasodilation on blood pressure and tissue perfusion?

Accepted Answer

Vasodilation decreases resistance, lowers blood pressure, and increases blood flow to tissues.

Question 4

A blood pressure reading is $$120/80 mm Hg. $$What is the pulse pressure, and what does it represent?

Accepted Answer

Pulse pressure is $$40 mm Hg$$, representing the difference between systolic and diastolic pressures.

Question 5

Which of the following is a correct pathway for lymph flow from the tissues back to the bloodstream?

Accepted Answer

Lymphatic capillaries → lymphatic vessels → lymph nodes → lymphatic trunks → collecting ducts → subclavian veins

Question 6

Which antibody class is most abundant in the blood and is primarily responsible for defense against bacteria, viruses, and toxins?

Accepted Answer

IgG

Question 7

A person is exposed to a new pathogen. Which immune cells are primarily responsible for producing antibodies specific to this pathogen, and what is the process called?

Accepted Answer

B cells differentiate into plasma cells, which produce antibodies in an adaptive immune response.

Question 8

Which of the following best describes the main function of the spleen in the lymphatic system?

Accepted Answer

It monitors blood for pathogens and facilitates immune interactions between lymphocytes and macrophages.

Question 9

During inspiration, which sequence of events allows air to move from the atmosphere into the lungs?

Accepted Answer

Diaphragm contracts, thoracic cavity volume increases, intrapulmonary pressure decreases, air flows into lungs.

Question 10

A patient hyperventilates for several minutes. What is the expected effect on the partial pressures of $$O_2$$ and $$CO_2 in $$their blood?

Accepted Answer

$$CO_2$$ decreases and $$O_2$$ increases in the blood.

Question 11

Which of the following best explains how the respiratory system helps regulate blood pH?

Accepted Answer

By altering the rate of $$CO_2$$ removal, which shifts the equilibrium $$CO_2 + H_2O$$ \leftrightarrow H_2CO_3 \leftrightarrow H^+ + $$HCO_3$$^-$$ and thus affects pH.

Question 12

Which of the following is the correct formula for calculating vital capacity (VC) in the lungs?

Accepted Answer

$$VC = TV + IRV + ERV$$

Question 13

Which structure in the respiratory tract is lined with pseudostratified ciliated columnar epithelium and contains C-shaped rings of hyaline cartilage?

Accepted Answer

Trachea

Question 14

Which of the following best describes the main function of pulmonary surfactant?

Accepted Answer

It reduces surface tension in the alveoli, preventing their collapse during exhalation.

Question 15

Which of the following best describes the difference between peristalsis and segmentation in the digestive tract?

Accepted Answer

Peristalsis propels food forward, while segmentation mixes food and increases contact with digestive enzymes.

Question 16

Which of the following enzymes is secreted by the pancreas and is responsible for digesting proteins?

Accepted Answer

Trypsin

Question 17

A patient has a blockage in their common bile duct. Which digestive process will be most directly affected?

Accepted Answer

Emulsification and digestion of fats in the small intestine.

Question 18

Which of the following best describes the effect of sympathetic stimulation on the alimentary canal?

Accepted Answer

It decreases digestive activity by inhibiting peristalsis and secretion.

Question 19

Which of the following is a function of the large intestine?

Accepted Answer

Absorption of water and electrolytes, and formation of feces.

Question 20

Which of the following best describes the role of the liver in digestion?

Accepted Answer

It produces bile, which emulsifies fats for digestion in the small intestine.

Study Guide: Cardiovascular, Lymphatic, Respiratory, and Digestive Systems

Study Guide - Practice Questions

Study Guide - Flashcards