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CHAPTER 8 HEART STRUCTURE, ECG, CARDIAC CYCLE REVISION SB025

Total questions: 35

Worksheet time: 45mins

Name
Class
Date
1.

Which chamber of the heart has the thickest wall?

a)
Left atrium
b)
Right atrium
c)
Left ventricle
d)
Right ventricle
2.

Which valve prevents the backflow of blood from the left ventricle to the left atrium?

a)

Tricuspid valve

b)

Pulmonary valve

c)

Aortic valve

d)

Bicuspid (mitral) valve

3.

What is the function of the sinoatrial (SA) node in the heart?

a)

To pump oxygenated blood to the lungs

b)

To act as the heart’s pacemaker, generating electrical impulses

c)

To prevent blood backflow into the ventricles

d)

To pump deoxygenated blood to the left atrium

4.

What is the function of the sinoatrial (SA) node in the heart?

a)

To pump oxygenated blood to the lungs

b)

To act as the heart’s pacemaker, generating electrical impulses

c)

To prevent blood backflow into the ventricles

d)

To pump deoxygenated blood to the left atrium

5.

Which vessel carries oxygenated blood from the lungs to the heart?

a)

Aorta

b)

Pulmonary vein

c)

Pulmonary artery

d)

 Vena cava

6.

Which statement about the regulation of heart rate is correct?

a)

An increase in blood pH will cause the heart rate to increase

b)

 The cardioacceleratory center in the medulla oblongata reduces heart rate

c)

The vagus nerve releases acetylcholine to decrease heart rate

d)

The sympathetic nervous system decreases the heart rate

7.

The right atrium receives (a)   blood from the body via the vena cava.

8.

The (a)   valve prevents backflow of blood from the right ventricle to the right atrium.

9.

Match the following

a)

Pumps oxygenated blood to the whole body

1.

Left ventricles

b)

Prevents backflow of blood into the atria

2.

AV Valves

c)

Carries oxygenated blood from lungs to heart

3.

Pulmonary veins

d)

Delivers deoxygenated blood to the lungs

4.

Pulmonary arteries

e)

Largest artery in the body

5.

Aorta

10.

Describe the sequence of the cardiac cycle, including the changes in pressure and valve movements.

Atrial Systole (0.1 sec): ​ (a)   contract, increasing atrial pressure, pushing blood into ​ (b)   . AV valves are open, and semilunar valves remain closed.

• Ventricular Systole (0.3 sec): Ventricles ​ (c)   , increasing ventricular pressure, closing ​ (d)   valves (“lub” sound) and opening semilunar valves. Blood is pumped into the pulmonary artery and aorta.

• Atrial and Ventricular Diastole (0.4 sec): Both atria and ventricles ​ (e)   , allowing blood to fill the atria from the veins. Semilunar valves close (“dup” sound) to prevent backflow.

Choose from the below words
Atria
ventricles
contract
AV
relax
11.

Identify the major chambers of the heart and blood vessels

a)Left Atrium
b)Right Atrium
c)Left Ventricle
d)Right Ventricle
e)Aorta
f)Pulmonary artery
g)Vena cava
h)Pulmonary vein
1
2
3
4
5
6
7
8
1)
2)
3)
4)
5)
6)
7)
8)
12.

What is the function of the sinoatrial (SA) node in the heart?

a)

To pump oxygenated blood to the lungs

b)

To act as the heart’s pacemaker, generating electrical impulses

c)

To prevent blood backflow into the ventricles

d)

To pump deoxygenated blood to the left atrium

13.
Which number is the pulmonary artery?
a)
4
b)
5
c)
6
d)
8
14.
Where is the blood in 3 coming from?
a)
All over the body
b)
The upper half of the body, head and arms
c)
The lower half of the body, legs and abdomen
d)
The lungs
15.
What does letter D represent?
a)
aorta
b)
left atrium
c)
left ventricle
d)
right atrium
16.

Which label is representing the Bundle of His?

a)

A

b)

C

c)

D

d)

E

17.

Identify the major chambers of the heart and blood vessels

a)Left Atrium
b)Right Atrium
c)Left Ventricle
d)Right Ventricle
e)Aorta
f)Pulmonary artery
g)Vena cava
h)Pulmonary vein
1
2
3
4
5
6
7
8
1)
2)
3)
4)
5)
6)
7)
8)
18.

Explain why the left ventricle has a thicker muscular wall compared to the right ventricle.

The left ventricle has to pump ​ (a)   blood to the ​ (b)   body through the systemic circulation, which requires a stronger ​ (c)   . In contrast, the right ventricle only pumps blood to the nearby ​ (d)   , which requires less force.

Choose from the below words
oxygenated
entire
contraction
lungs
local
veins
deoxygenated
partial
relaxation
19.

Match the following

a)

Pumps oxygenated blood to the whole body

1.

Left ventricles

b)

Prevents backflow of blood into the atria

2.

AV Valves

c)

Carries oxygenated blood from lungs to heart

3.

Pulmonary veins

d)

Delivers deoxygenated blood to the lungs

4.

Pulmonary arteries

e)

Largest artery in the body

5.

Aorta

20.

Which chamber is the strongest?

A
B
C
D
21.

The Vena Cava delivers blood to the heart into the.....

a)

left atrium

b)

right atrium

c)

left ventricle

d)

right ventricle

22.

#1 is pointing to the:

a)

SA node

b)

AV node

c)

AV bundle

d)

Purkinje fibers

23.

#2 is pointing to the:

a)

SA node

b)

AV node

c)

AV bundle branches

d)

Purkinje fibers

24.

#3 is pointing to the:

a)

AV node

b)

Bundle of His

c)

Bundle branches

d)

Purkinje fibers

25.

What is happening during the P wave?

a)

Atrial repolarization (atrial diastole)

b)

Atrial depolarization (atrial systole)

c)

Ventricular repolarization (ventricular diastole)

d)

Ventricular depolarization (ventricular systole)

26.

What is happening during the QRS complex?

a)

Atrial repolarization (atrial diastole)

b)

Atrial depolarization (atrial systole)

c)

Ventricular repolarization (ventricular diastole)

d)

Ventricular depolarization (ventricular systole)

27.

What is happening during the T wave?

a)

Semilunar valves close

b)

Atria are in systole

c)

Ventricles are in diastole

d)

Ventricles are in systole

28.

What is another name for the "pacemaker" of the heart?

a)

SA node

b)

AV node

c)

AV bundle

d)

Purkinje fibers

29.

Why is the left ventricular wall so much thicker than the right ventricular wall?

a)

Blood from the right side is being pushed so much farther

b)

Blood from the left side is not being pushed as far

c)

It's not, it's the same thickness

d)

Blood from the left side is being pushed so much farther

30.
a)

Electrolysis

b)

Electromagnet

c)

Electrocardiogram

31.

What is the function of valves present in the veins?

a)

Ensure blood flow back to the heart

b)

Prevent blood clotting

c)

Ensure blood flow in one direction

32.

What is the primary role of the right atrium in the heart?

a)

To pump oxygenated blood to the body

b)

To receive deoxygenated blood from the body

c)

To pump deoxygenated blood to the lungs

d)

To receive oxygenated blood from the lungs

33.
Identify the circled valve
a)
Tricuspid
b)
Mitral
c)
Pulmonary
d)
Aortic
34.

What is the name of valve A?

a)

Tricuspid

b)

Bicuspid

c)

Aortic Semilunar

d)

Pulmonary Semilunar

35.

Label the Valves

a)Semilunar Valve
b)Atrioventricular Valve
1
2
1)
2)

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