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Quiz Chapter 10: Transport in Humans and Animals

10 questions · Form 4 Biology Bab 10: Transport in Humans and Animals

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Which structure in the human heart is known as the natural pacemaker because it initiates electrical impulses for cardiac contraction?

  1. A. Atrioventricular (AV) node
  2. B. Sinoatrial (SA) node
  3. C. Bundle of His
  4. D. Purkyne fibers
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Answer: B

The Sinoatrial (SA) node located in the right atrium generates rhythmic electrical signals that set the pace for heart contractions.

2. Why does the left ventricle of the human heart have a significantly thicker muscular myocardium wall than the right ventricle?

  1. A. It holds a larger total volume of blood than the right ventricle.
  2. B. It requires greater contractile force to pump blood through the high-resistance systemic circulation.
  3. C. It receives deoxygenated blood directly from the vena cava.
  4. D. It prevents mixing of oxygenated and deoxygenated blood.
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Answer: B

The left ventricle pumps blood throughout the entire body (systemic circuit), which requires much higher pressure than pumping blood to nearby lungs.

3. Which type of blood vessel contains valves along its length to maintain one-way blood flow under low pressure?

  1. A. Artery
  2. B. Arteriole
  3. C. Vein
  4. D. Capillary
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Answer: C

Veins carry blood under low pressure and contain semilunar valves to prevent backflow caused by gravity.

4. During cardiac contraction, electrical impulses travel from the AV node down the septum through which specialized conducting tissue?

  1. A. Sinoatrial node
  2. B. Bundle of His
  3. C. Coronary sinus
  4. D. Bicuspid valve
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Answer: B

The Bundle of His conducts electrical signals from the AV node down the interventricular septum toward Purkyne fibers.

5. Which condition is characterized by the accumulation of cholesterol and fatty deposits on the inner walls of arteries?

  1. A. Arteriosclerosis
  2. B. Atherosclerosis
  3. C. Lymphangitis
  4. D. Hemophilia
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Answer: B

Atherosclerosis involves plaque/fatty deposit build-up inside arterial walls, narrowing the lumen.

6. What movement assists the flow of lymph along lymphatic vessels towards the subclavian veins?

  1. A. Pumping action of the heart
  2. B. Contraction of surrounding skeletal muscles and presence of internal valves
  3. C. High arterial blood pressure
  4. D. Active transport by epithelial cells
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Answer: B

Lymphatic vessels lack a central pump; lymph moves via skeletal muscle contractions squeezing vessels, guided by internal one-way valves.

7. Which animal possesses an open circulatory system where hemolymph bathes organs directly within a hemocoel?

  1. A. Earthworm
  2. B. Grasshopper
  3. C. Toad
  4. D. Salmon
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Answer: B

Insects like grasshoppers have an open circulatory system with hemolymph flowing into the body cavity (hemocoel).

8. What primary force causes water and small dissolved solutes to filter out of blood capillaries into intercellular spaces to form tissue fluid?

  1. A. Osmotic pressure
  2. B. High hydrostatic pressure at the arterial end
  3. C. Active transport by endothelial cells
  4. D. Suction pressure from lymphatic valves
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Answer: B

Pumping action of the heart creates high hydrostatic pressure at the arterial end of capillaries, forcing liquid out into tissue spaces.

9. What soluble plasma protein is converted by thrombin into insoluble threads during clot formation?

  1. A. Fibrinogen
  2. B. Prothrombin
  3. C. Albumin
  4. D. Globulin
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Answer: A

Thrombin hydrolyzes soluble fibrinogen into insoluble fibrin strands that trap cells to seal wounds.

10. What path does blood take in a fish single circulatory system?

  1. A. Heart -> Body tissues -> Gills -> Heart
  2. B. Heart -> Gills -> Body tissues -> Heart
  3. C. Heart -> Lungs -> Heart -> Body tissues
  4. D. Gills -> Heart -> Body tissues -> Gills
Show answer

Answer: B

In fish, blood is pumped from the 2-chambered heart to the gills for oxygenation, flows to body tissues, and returns to the heart.

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