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Cardiac Physiology introduction Quiz

Total questions: 27

Worksheet time: 14mins

Name
Class
Date
1.

The heart is best described anatomically as:

a)

A single hollow chamber

b)

Two chambers separated by valves

c)

Four chambers arranged into right and left sides

d)

A solid muscular organ

2.

The pericardium mainly functions to:

a)

Produce contraction

b)

Prevent over-distension of the heart

c)

Generate action potentials

d)

Increase cardiac output

3.

Which chamber pumps blood into the pulmonary circulation?

a)

Left atrium

b)

Right atrium

c)

Right ventricle

d)

Left ventricle

4.

Systemic circulation starts from the:

a)

Right ventricle

b)

Left atrium

c)

Left ventricle

d)

Right atrium

5.

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

a)

Tricuspid

b)

Pulmonary

c)

Aortic

d)

Mitral

6.

Semilunar valves include:

a)

Mitral and tricuspid

b)

Tricuspid and pulmonary

c)

Aortic and pulmonary

d)

Aortic and mitral

7.

Valve opening and closing is mainly dependent on:

a)

Electrical activity

b)

Muscle contraction

c)

Pressure differences

d)

Neural stimulation

8.

Ordinary cardiac muscle fibers are mainly responsible for:

a)

Initiating impulses

b)

Conducting impulses rapidly

c)

Contractile force

d)

Pacemaker activity

9.

Specialized cardiac fibers are characterized by:

a)

Strong contraction

b)

Automaticity

c)

High myoglobin content

d)

Large diameter

10.

The main pacemaker of the heart is:

a)

AV node

b)

Bundle of His

c)

Purkinje fibers

d)

SA node

11.

Functional syncytium means:

a)

Cells are anatomically fused

b)

Cells act as a single unit electrically

c)

Cells share the same nucleus

d)

Cells contract independently

12.

Stroke Volume (SV) is:

a)

HR × CO

b)

EDV - ESV

c)

CO ÷ HR

d)

EDV + ESV

13.

Cardiac Output (CO) equals:

a)

SV × HR

b)

SV ÷ HR

c)

EDV - ESV

d)

HR - SV

14.

Normal resting HR in adults is approximately:

a)

40 bpm

b)

60-100 bpm

c)

120 bpm

d)

150 bpm

15.

Increase in EDV leads to:

a)

Decreased SV

b)

No change in SV

c)

Increased SV

d)

Cardiac arrest

16.

Which structure delays impulse conduction?

a)

SA node

b)

AV node

c)

Bundle branches

d)

Purkinje fibers

17.

The delay at AV node allows:

a)

Ventricles to contract first

b)

Atria to empty into ventricles

c)

Faster heart rate

d)

Reduced cardiac output

18.

Purkinje fibers are characterized by:

a)

Slow conduction

b)

Fast conduction

c)

Weak contraction

d)

Pacemaker dominance

19.

Damage to SA node leads to:

a)

Cardiac arrest immediately

b)

Ventricular fibrillation

c)

AV node taking over as pacemaker

d)

No effect

20.

Anatomical syncytium is prevented by:

a)

Gap junctions

b)

Intercalated discs

c)

Cell membranes

d)

Valves

21.

Which chamber has the thickest wall?

a)

Right atrium

b)

Left atrium

c)

Right ventricle

d)

Left ventricle

22.

Pulmonary circulation is:

a)

High pressure, high resistance

b)

Low pressure, low resistance

c)

High pressure, low resistance

d)

Low pressure, high resistance

23.

Increased HR with constant SV will:

a)

Decrease CO

b)

Increase CO

c)

No effect

d)

Stop heart

24.

The conduction pathway normally starts at:

a)

AV node

b)

Purkinje fibers

c)

SA node

d)

Bundle of His

25.

Which factor directly affects SV?

a)

HR only

b)

EDV and ESV

c)

Blood pressure only

d)

Oxygen saturation

26.

Loss of functional syncytium causes:

a)

Strong contraction

b)

Coordinated pumping

c)

Fibrillation

d)

Bradycardia

27.

The main purpose of the conduction system is:

a)

Nutrition

b)

Oxygen delivery

c)

Coordinated contraction

d)

Valve closure

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