Introduction to Human Body Systems

Cardiovascular • Respiratory • Lymphatic • Digestive • Urinary

Masinde Muliro University of Science and Technology (MMUST)

Department of Electrical & Communication Engineering — 3rd Year Undergraduate

30 Questions Bloom Levels: Remember • Understand • Apply Post-Test Answers & Explanations Included

Instructions to the Candidate

  1. This quiz contains 30 questions divided equally across five body systems (6 questions each): Cardiovascular, Respiratory, Lymphatic, Digestive, and Urinary.
  2. All questions are set at the first three levels of Bloom's Taxonomy:
    • REMEMBER Recall of facts, terms and basic concepts.
    • UNDERSTAND Explanation of ideas, interpretation and classification.
    • APPLY Use of knowledge in simple situations and basic problem solving.
  3. Answer all questions. Each question carries 1 mark (Total: 30 marks).
  4. Select the single best answer for each multiple-choice question.
  5. The interactive "Submit & Score" button gives instant formative feedback. The full Answer Key with Explanations (Part B) should be consulted only after attempting the quiz.
  6. Time recommended: 45 minutes.

Part A — The Quiz (Answer All Questions)

Section 1: Cardiovascular System

  1. Which organ acts as the muscular pump of the cardiovascular system? REMEMBER
  2. Which blood vessels carry oxygenated blood away from the heart to the body? REMEMBER
  3. Which chamber of the heart pumps oxygenated blood into the aorta? REMEMBER
  4. A patient's electrocardiogram (ECG) shows the signal generated when the atria depolarise. Which wave does the doctor observe? APPLY
  5. Why does the wall of the left ventricle contain more cardiac muscle than the wall of the right ventricle? UNDERSTAND
  6. Which of the following best explains the function of valves in the heart? UNDERSTAND

Section 2: Respiratory System

  1. What is the primary function of the respiratory system? REMEMBER
  2. In which structures does gas exchange between air and blood actually occur? REMEMBER
  3. Which muscle is the main driver of inspiration (inhalation)? REMEMBER
  4. A medical sensor in the blood detects a rise in carbon dioxide concentration. Which change in breathing is expected? APPLY
  5. Why are the alveolar walls only one cell thick? UNDERSTAND
  6. Which statement correctly describes the pathway of air during inhalation? UNDERSTAND

Section 3: Lymphatic System

  1. Which fluid does the lymphatic system collect from body tissues? REMEMBER
  2. What are the small bean-shaped structures that filter lymph and house immune cells called? REMEMBER
  3. Which organ, belonging to both the lymphatic and immune systems, maturates T-lymphocytes (T cells)? REMEMBER
  4. A doctor palpates (feels) a patient's neck and finds swollen, tender lumps under the jaw. Which lymphatic structures are most likely swollen? APPLY
  5. Why is the return of tissue fluid to the blood circulation by the lymphatic system important? UNDERSTAND
  6. Which of the following is a major function of the lymphatic system? UNDERSTAND

Section 4: Digestive System

  1. Where does the digestion of food begin in the human body? REMEMBER
  2. Which organ produces bile, which helps emulsify fats? REMEMBER
  3. Most absorption of digested nutrients takes place in which part of the digestive tract? REMEMBER
  4. A patient is unable to produce enough insulin from the pancreas. Which nutrient's blood-level regulation is directly affected? APPLY
  5. Why does the stomach lining contain many folds (rugae)? UNDERSTAND
  6. Which statement best describes mechanical digestion? UNDERSTAND

Section 5: Urinary System

  1. Which organs filter the blood and produce urine? REMEMBER
  2. What is the functional filtering unit of the kidney called? REMEMBER
  3. Through which tube does urine travel from the kidney to the urinary bladder? REMEMBER
  4. After drinking a large amount of water, a person's urine becomes dilute and increases in volume. Which hormone's action has decreased to cause this? APPLY
  5. Why is the bladder lined with transitional epithelium? UNDERSTAND
  6. Which of the following best describes the role of the kidneys in homeostasis? UNDERSTAND

Part B — Post-Test Answer Key with Explanations

Consult this section only after completing the quiz. Each answer includes the Bloom's level targeted and a short explanation.

Q#AnswerSystemBloom LevelExplanation
1BCardiovascularRememberThe heart is a muscular organ that pumps blood around the body; the lungs, liver and kidneys have other primary roles.
2CCardiovascularRememberArteries carry blood away from the heart; the aorta carries oxygenated blood to the body. Veins return blood to the heart.
3DCardiovascularRememberThe left ventricle pumps oxygen-rich blood through the aortic valve into the aorta for systemic circulation.
4ACardiovascularApplyThe P wave on an ECG represents atrial depolarisation; the QRS complex shows ventricular depolarisation and the T wave ventricular repolarisation.
5BCardiovascularUnderstandThe left ventricle must pump blood at high pressure through the entire systemic circuit, so its wall is thicker than the right ventricle, which only pumps to the nearby lungs.
6CCardiovascularUnderstandHeart valves are one-way gates: they open with pressure differences and close to prevent backflow of blood (e.g., AV valves prevent backflow into the atria).
7BRespiratoryRememberThe primary role of the respiratory system is gas exchange — taking in O₂ and removing CO₂ between air and blood.
8CRespiratoryRememberAlveoli are tiny air sacs whose walls are wrapped in capillaries; this is where O₂ and CO₂ diffuse across the membrane.
9BRespiratoryRememberThe diaphragm contracts and flattens during inspiration, increasing thoracic volume and drawing air into the lungs.
10ARespiratoryApplyHigh blood CO₂ (detected by chemoreceptors) signals the breathing centre to increase rate and depth of ventilation to expel more CO₂.
11BRespiratoryUnderstandA thin (one-cell) alveolar wall plus a thin capillary wall minimises diffusion distance, making gas exchange fast and efficient.
12BRespiratoryUnderstandInhaled air moves: nose/mouth → pharynx → larynx → trachea → bronchi → bronchioles → alveoli.
13ALymphaticRememberAs blood flows through capillaries, plasma leaks into tissues; the lymphatic system collects this interstitial fluid as lymph.
14CLymphaticRememberLymph nodes filter lymph, trapping pathogens and foreign particles, and contain lymphocytes for immune responses.
15CLymphaticRememberThe thymus is where T-lymphocytes mature; the spleen filters blood, while tonsils and appendix are lymphoid tissues.
16ALymphaticApplySwollen "glands" during infection are enlarged lymph nodes actively filtering lymph and mounting an immune response.
17ALymphaticUnderstandReturning leaked fluid to blood prevents oedema (swelling) and maintains blood volume and tissue fluid balance.
18BLymphaticUnderstandThe lymphatic system transports lymph (immune surveillance), absorbs dietary fats via lacteals, and returns fluid to the blood.
19BDigestiveRememberDigestion begins in the mouth, where teeth mechanically break food and salivary amylase starts carbohydrate digestion.
20CDigestiveRememberThe liver produces bile; the gallbladder only stores and concentrates it. Bile emulsifies fats into droplets.
21DDigestiveRememberThe small intestine, with villi and microvilli giving huge surface area, absorbs about 90% of digested nutrients.
22ADigestiveApplyInsulin lowers blood glucose by promoting its uptake into cells; deficiency causes diabetes mellitus.
23BDigestiveUnderstandRugae allow the stomach to expand to accommodate a meal, then fold back as the stomach empties.
24BDigestiveUnderstandMechanical digestion (chewing, churning) physically reduces food size; chemical digestion uses enzymes to break molecules down.
25BUrinaryRememberThe two kidneys filter about 180 L of blood-derived fluid daily, removing wastes to form urine.
26BUrinaryRememberEach kidney contains about one million nephrons — the structural and functional units where filtration, reabsorption and secretion occur.
27BUrinaryRememberUreters carry urine from kidneys to bladder by peristalsis; the urethra carries urine out of the body.
28BUrinaryApplyADH makes the kidney reabsorb water. With low ADH, less water is reabsorbed, producing large volumes of dilute urine.
29BUrinaryUnderstandTransitional epithelium stretches without tearing as the bladder fills and recoils when emptying — a barrier against urine.
30BUrinaryUnderstandKidneys maintain homeostasis by excreting metabolic wastes (urea) and adjusting water, electrolyte and pH levels of the blood.

Question Distribution by Bloom's Level & System

SystemRememberUnderstandApplyTotal
Cardiovascular3 (Q1–Q3)2 (Q5–Q6)1 (Q4)6
Respiratory3 (Q7–Q9)2 (Q11–Q12)1 (Q10)6
Lymphatic3 (Q13–Q15)2 (Q17–Q18)1 (Q16)6
Digestive3 (Q19–Q21)2 (Q23–Q24)1 (Q22)6
Urinary3 (Q25–Q27)2 (Q29–Q30)1 (Q28)6
Total1510530

Recommended pass mark: 18/30 (60%). Questions are deliberately restricted to Bloom's levels 1–3 (Remember, Understand, Apply) as required for an introductory biomedical unit for engineering students.