Lesson 1.1.3
1.1.3 Structure and operation of the mammalian heart Quiz: Pearson Edexcel Biology, Unit 1
20 questions
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Lesson 1.1.3, Structure and operation of the mammalian heart: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 1: Lifestyle, Health and Risk, written with Revision Ninja.
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The 20 questions
-
Which chamber of the mammalian heart has the thickest muscular wall?
- Right ventricle
- Right atrium
- Left ventricle
- Left atrium
-
Which phase immediately follows atrial systole in the cardiac cycle?
- Cardiac diastole
- Ventricular diastole
- Atrial diastole
- Ventricular systole
-
What is the primary function of the atrioventricular valves?
- Delay impulses
- Increase pressure
- Prevent backflow
- Generate signals
-
What causes the semilunar valves to close during the cardiac cycle?
- Higher arterial pressure
- Ventricular contraction
- Higher atrial pressure
- Skeletal muscle movement
-
Which blood vessel carries deoxygenated blood from the right ventricle to the lungs?
- Vena cava
- Aorta
- Pulmonary vein
- Pulmonary artery
-
Which heart chamber receives oxygenated blood directly from the lungs?
- Left atrium
- Left ventricle
- Right atrium
- Right ventricle
-
A heart beats at 75 beats per minute. What is the duration of one complete cardiac cycle?
- 0.8 s
- 75 s
- 1.25 s
- 0.075 s
-
A ventricle has a stroke volume of 70 cm^3 and the heart rate is 70 beats per minute. What is the cardiac output?
- 140 cm^3 per minute
- 1000 cm^3 per minute
- 70 cm^3 per minute
- 4900 cm^3 per minute
-
What causes the first sound of a heartbeat, known as lub?
- Closing AV valves
- Closing semilunar valves
- Opening AV valves
- Opening semilunar valves
-
Why do the ventricles contract from the apex upwards towards the arteries?
- Open AV valves
- Push blood upwards
- Fill the atria
- Delay electrical signals
-
Which blood vessels supply oxygenated blood directly to the heart muscle?
- Coronary veins
- Coronary arteries
- Carotid arteries
- Pulmonary arteries
-
Why does the atrioventricular node delay the electrical impulse before ventricular contraction?
- Semilunar valves close
- Atria finish contracting
- Ventricles empty completely
- AV valves open
-
In a heart with a heart rate of 60 beats per minute and a stroke volume of 75 cm^3, what is the cardiac output in dm^3 per minute?
- 4.5 dm^3 per minute
- 0.45 dm^3 per minute
- 45 dm^3 per minute
- 1.25 dm^3 per minute
-
What is the main function of the septum in the heart?
- Generates electrical signals
- Pumps oxygenated blood
- Prevents blood mixing
- Prevents arterial backflow
-
Why is the left ventricle wall thicker than the right ventricle wall?
- Pumps larger volume
- Pumps smaller volume
- Generates lower pressure
- Generates higher pressure
-
Which pressure change causes the atrioventricular valves to open?
- Atrial above ventricular
- Ventricular above aortic
- Aortic above ventricular
- Ventricular above atrial
-
What does myogenic mean regarding cardiac muscle contraction?
- Requires nerve impulses
- Self-initiates contractions
- Stimulated by hormones
- Triggered by oxygen
-
During which phase of the cardiac cycle is aortic pressure highest?
- Ventricular systole
- Atrial diastole
- Atrial systole
- Ventricular diastole
-
What happens to cardiac output if heart rate doubles while stroke volume remains constant?
- It halves
- It stays unchanged
- It quadruples
- It doubles
-
What is the main role of the sinoatrial node in the heart?
- Conducts through ventricles
- Opens heart valves
- Acts as pacemaker
- Delays electrical impulses
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