Transport in Animals
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Heart structure and function
SubtopicHeart structure and function under Transport in Animals for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
Which vessel has the highest oxygen concentration?
A.Pulmonary artery
B.Vena cava
C.Pulmonary vein
D.Hepatic portal vein
- 2.
Cardiac output is a measure of what?
A.The volume of blood pumped by the heart per minute
B.The pressure of blood in the arteries
C.The speed of electrical impulses in the heart
D.The thickness of the ventricle walls
- 3.
Which of these occurs first in a heartbeat cycle?
A.Ventricular contraction
B.Atrial contraction
C.Closure of semilunar valves
D.Blood entering the aorta
- 4.
Which chamber receives blood returning from the legs and trunk?
A.Left atrium
B.Right atrium
C.Left ventricle
D.Right ventricle
- 5.
What is the fundamental purpose of all valves found within the human heart?
A.To increase the speed of blood flow
B.To ensure that blood flows in only one direction
C.To separate oxygenated blood from deoxygenated blood
D.To filter out waste products from the blood
- 6.
Which of the following heart chambers must generate the highest internal pressure to perform its function?
A.Right Atrium
B.Left Atrium
C.Right Ventricle
D.Left Ventricle
- 7.
In the context of heart monitoring, what does the unit 'bpm' stand for?
A.Blood Pressure Maximum
B.Beats Per Minute
C.Blood Pumped Monthly
D.Biological Pulse Measurement
- 8.
If a patient’s heart has a damaged sinoatrial node (SAN) but a functional atrioventricular node (AVN), what is the most likely ECG finding?
A.A normal ECG with a rate of 72 bpm.
B.The absence of P-waves and a slower-than-normal heart rate.
C.A very fast heart rate with multiple P-waves per QRS complex.
D.An inverted T-wave.
- 9.
What is the primary role of the 'atrial kick' (atrial systole) during the cardiac cycle?
A.It accounts for about 80% of total ventricular filling.
B.It provides the final 20-30% of blood to the ventricles before they contract.
C.It generates enough pressure to open the aortic valve.
D.It triggers the firing of the sinoatrial node.
- 10.
Which of the following is true about the pressure in the left atrium during the cardiac cycle?
A.It is always higher than the pressure in the left ventricle.
B.It is highest during ventricular systole when the bicuspid valve is closed.
C.It rises slightly during atrial systole and is generally low to allow filling from the pulmonary veins.
D.It matches the aortic pressure during the ejection phase.
Download the worksheet for Transport in Animals - Heart structure and function to practice offline. It includes additional chapter-level practice questions.
Blood and lymphatic vessels
SubtopicBlood and lymphatic vessels under Transport in Animals for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
Which of these statements about the pulmonary circulation is true?
A.It carries blood at a higher pressure than the systemic circulation
B.It involves the transport of blood between the heart and the lungs
C.The pulmonary artery carries oxygenated blood
D.The pulmonary vein carries deoxygenated blood
- 2.
What is the primary role of the muscle layer in the wall of an arteriole?
A.To pump blood back to the heart
B.To contract and relax to regulate blood flow to tissues
C.To produce new red blood cells
D.To prevent the backflow of blood
- 3.
Why do capillaries form extensive networks (beds) in tissues?
A.To increase blood pressure for faster flow
B.To provide a large surface area for exchange
C.To prevent blood from clotting too quickly
D.To store excess oxygen for later use
- 4.
Which substance is found in a higher concentration in the renal artery than in the renal vein?
A.Carbon dioxide
B.Urea
C.Glucose
D.Water
- 5.
The diagram illustrates the flow of fluid between a blood capillary and the lymphatic system within a tissue. Which statement correctly identifies a structural characteristic of the vessel labeled X that distinguishes it from the blood capillary?
A.It contains a thick tunica media to withstand high systolic blood pressure.
B.It is a blind-ended tube that originates directly within the tissue spaces.
C.Its wall is composed of a single layer of squamous endothelial cells.
D.It forms a continuous loop connecting the arterial and venous systems.
- 6.
Why is the wall of the left ventricle thicker than the wall of the right ventricle?
A.It needs to pump blood at a higher pressure to the lungs
B.It needs to overcome the high resistance of the systemic circulation
C.It must prevent deoxygenated blood from mixing with oxygenated blood
D.It needs to pump a larger volume of blood with each beat
- 7.
What differentiates a closed circulatory system from an open one?
A.In a closed system, blood is always contained within vessels
B.In a closed system, blood directly bathes the organs
C.In a closed system, there is no heart to pump the fluid
D.In a closed system, oxygen is carried by the lymphatic system
- 8.
The 'Venous System' is sometimes referred to as a 'Capacitance System'. What does this term imply about the veins?
A.They have the highest resistance to blood flow.
B.They have a high capacity to stretch and store a large volume of blood at low pressure.
C.They have the ability to generate their own electrical impulses like the heart.
D.They are the primary site where oxygen is loaded onto hemoglobin.
- 9.
Which of the following factors would increase the 'Oncotic Pressure' of the blood?
A.Drinking a large amount of water.
B.A decrease in the concentration of sodium ions in the plasma.
C.An increase in the concentration of plasma proteins, such as through dehydration.
D.A decrease in the number of circulating red blood cells.
- 10.
What is the primary role of 'Anastomoses' in the circulatory system?
A.To increase the total surface area for gas exchange.
B.To provide alternative pathways (collateral circulation) for blood flow to a tissue or organ.
C.To act as a filter for removing metabolic waste products.
D.To regulate the temperature of the blood before it reaches the brain.
Download the worksheet for Transport in Animals - Blood and lymphatic vessels to practice offline. It includes additional chapter-level practice questions.
Composition of blood
SubtopicComposition of blood under Transport in Animals for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
Which of the following best describes the function of hemoglobin?
A.Transporting glucose
B.Binding reversibly with oxygen
C.Engulfing viruses
D.Producing fibrin
- 2.
Vitamins and minerals are transported to cells via which blood component?
A.Red blood cells
B.Plasma
C.White blood cells
D.Platelets
- 3.
Which of these correctly describes platelets?
A.Large cells with multiple nuclei
B.Small cell fragments without nuclei
C.Cells that carry oxygen
D.Cells that produce antibodies
- 4.
How do phagocytes move through the walls of capillaries to reach infected tissues?
A.They use tiny oars
B.They use amoeboid movement to squeeze through gaps
C.They turn into liquid
D.They are pumped by the heart through holes
- 5.
Which of the following best describes 'oxyhemoglobin'?
A.A mixture of oxygen and plasma
B.A bright red compound formed by the reversible union of hemoglobin and oxygen
C.A dark purple substance formed when oxygen is released into tissues
D.An enzyme that breaks down oxygen in the lungs
- 6.
Which of the following substances is NOT typically transported in large quantities by the blood plasma?
A.Urea
B.Glycogen
C.Sodium chloride
D.Amino acids
- 7.
What is the physiological benefit of the flexibility of the red blood cell membrane?
A.It allows the cell to store more hemoglobin
B.It allows the cell to pass through narrow capillaries without rupturing
C.It prevents the cell from being recognized by phagocytes
D.It helps the cell to absorb more glucose from the plasma
- 8.
Which of these factors is a powerful vasodilator released by mast cells and basophils that increases capillary permeability during an injury?
A.Serotonin
B.Epinephrine
C.Histamine
D.Thromboxane
- 9.
How does the binding of to hemoglobin differ from the binding of ?
A.Both bind to the iron atom in the heme group
B.binds to the heme group, while binds to the amino groups of the globin chains
C.binds to the iron atom, while binds to the surface of the protein
D.only binds to hemoglobin when the iron is in the ferric () state
- 10.
Where does the synthesis of the majority of plasma proteins occur?
A.Red bone marrow
B.Spleen
C.Liver
D.Thymus
Download the worksheet for Transport in Animals - Composition of blood to practice offline. It includes additional chapter-level practice questions.