Transportation in Humans and Animals

Free sample questions

Transportation in Humans and Animals — sample Biology questions with answers

1. Question 1

   What is the main function of the human circulatory system?

   • ATransport oxygen and nutrients to body cells
   • BProduce antibodies to fight pathogens
   • CRegulate body temperature through sweat
   • DRemove nitrogenous waste such as urea

   Answer: A. Transport oxygen and nutrients to body cells

   The circulatory system functions to transport oxygen, nutrients, hormones, and other substances to cells, as well as to carry carbon dioxide and metabolic waste for removal.

2. Question 2

   Which blood component functions in blood clotting?

   • AErythrocytes
   • BLeukocytes
   • CPlatelets (thrombocytes)
   • DBlood plasma

   Answer: C. Platelets (thrombocytes)

   Platelets contain thrombokinase which converts prothrombin to thrombin, then converts fibrinogen to fibrin to form a blood clot.

3. Question 3

   In the human circulatory system, the pulmonary vein transports blood rich in?

   • AOxygen
   • BCarbon dioxide
   • CUrea
   • DGlucose

   Answer: A. Oxygen

   The pulmonary vein carries oxygenated blood from the lungs to the left atrium, unlike the pulmonary artery which carries deoxygenated blood.

4. Question 4

   Which of the following is a characteristic of arteries?

   • AThick and elastic walls
   • BHave valves to prevent backflow
   • CLow blood pressure
   • DSlow blood flow

   Answer: A. Thick and elastic walls

   Arteries have thick, muscular, and elastic walls to withstand high blood pressure produced by ventricular contraction.

5. Question 5

   What is meant by systolic blood pressure?

   • APressure in the arteries during ventricular relaxation
   • BPressure in the arteries during ventricular contraction
   • CPressure in the veins during atrial contraction
   • DPressure in the capillaries during gas exchange

   Answer: B. Pressure in the arteries during ventricular contraction

   Systolic pressure is the maximum pressure in the arteries during ventricular contraction (systole).