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Biology for IGCSE & O level - Transport In Animals (Section 7)

1
What is the role of iron in the context of hemoglobin?
Answer
(B)
It helps the hemoglobin bind to oxygen.
2
What is the name of the valve between the right atrium and right ventricle?
Answer
(C)
Tricuspid valve
3
What is the name of the protein in red blood cells that binds to oxygen?
Answer
(C)
Hemoglobin
4
What is the primary function of the circulatory system?
Answer
(B)
To transport nutrients and waste products to and from cells.
5
What are the benefits of blood clotting?
Answer
A
C
6
Which of the following is the most muscular chamber of the heart?
Answer
(D)
The left ventricle.
7
How does the shape of red blood cells aid in their function?
Answer
(C)
It increases their surface area for oxygen absorption.
8
What is the main function of red blood cells?
Answer
(B)
To carry oxygen.
9
What is the function of the capillaries?
Answer
(B)
To exchange substances between blood and tissues
10
What is the role of phagocytes?
Answer
(B)
Ingest pathogens.
11
What is the meaning of the term 'ischemia' in the context of heart disease?
Answer
(B)
Lack of blood supply to the heart muscle
12
What is the function of the valves in veins?
Answer
(B)
To prevent backflow of blood
13
Where does deoxygenated blood enter the heart?
Answer
(B)
Right atrium
14
What is the name of the blood vessel that carries blood from the heart to the lungs?
Answer
(B)
Pulmonary artery
15
What is the role of the sinoatrial (SA) node?
Answer
(B)
To initiate the heartbeat
16
What are the main risk factors for Coronary Heart Disease?
Answer
A
B
C
17
What are some of the components found in blood plasma?
Answer
A
B
D
18
What is the function of phagocytes?
Answer
(B)
Ingest and destroy pathogens.
19
Which components of blood are involved in blood clotting?
Answer
(B)
Platelets and fibrinogen
20
Which of the following is an example of a lifestyle change to prevent CHD?
Answer
(B)
Eating a balanced diet
21
What are the symptoms of a myocardial infarction?
Answer
(A)
Chest pain, shortness of breath, nausea
22
In the context of blood clotting, what is fibrin?
Answer
(C)
An insoluble protein that forms a meshwork to trap blood cells
23
What do lymphocytes produce to protect the body against disease?
Answer
(B)
Antibodies
24
What does an ECG measure?
Answer
(C)
Electrical activity of the heart.
25
What is the role of the pulmonary artery?
Answer
(B)
Carry deoxygenated blood to the lungs
26
What happens to the oxygen in the lungs?
Answer
(A)
It is transported to the red blood cells
27
What is the correct sequence of blood flow through the heart?
Answer
(A)
Right atrium -> Right ventricle -> Lungs -> Left atrium -> Left ventricle
28
What is the role of the atria?
Answer
(B)
Receiving blood from the body and lungs.
29
Which blood vessels carry blood away from the heart?
Answer
(C)
Arteries.
30
Which component of blood is responsible for carrying oxygen?
Answer
(D)
Red Blood Cells
31
What is the name of the arteries that supply blood to the heart muscle?
Answer
(B)
Coronary arteries
32
Which lifestyle factors increase the risk of developing coronary heart disease (CHD)?
Answer
B
C
33
What is the function of the valves within veins?
Answer
(C)
To prevent backflow of blood.
34
What is the function of the scab?
Answer
(C)
To keep the cut clean.
35
What is the function of capillaries?
Answer
(C)
Exchange of materials between blood and tissues
36
What does the term 'systole' refer to?
Answer
(B)
Contraction of the ventricles
37
Which of the following structures is directly involved in regulating the heart rate?
Answer
(C)
SA node
38
What is the function of the coronary arteries?
Answer
(B)
To supply blood to the heart muscle
39
What can atherosclerosis lead to?
Answer
(C)
Heart attack
40
What is the primary role of platelets in the circulatory system?
Answer
(C)
Clotting blood
41
What is the correct order of events in blood clotting?
Answer
(B)
Platelets release substances, fibrin is formed, and a scab is formed.
42
What type of blood vessel carries blood back to the heart from the tissues?
Answer
(B)
Vein
43
What type of blood vessel carries blood from the capillaries back to the heart?
Answer
(B)
Veins
44
Which blood vessels transport oxygenated blood?
Answer
(B)
Arteries only
45
What is the name of the outermost layer of the heart?
Answer
(C)
Epicardium
46
What is the role of white blood cells?
Answer
(C)
Fighting infections
47
Which of the following is NOT a component of blood?
Answer
(C)
Nerves
48
Which of the following is NOT a characteristic of arteries?
Answer
(C)
Valves
49
Which of the following is the function of the atria?
Answer
(B)
Receiving blood from the veins.
50
What is the main function of red blood cells?
Answer
(B)
To transport oxygen.