Human Body: BMI And ECG Quiz

16 Questions | By Arunkumarram | Updated: Mar 20, 2022 | Attempts: 142

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Are you aware of how the human body relates to BMI and ECG? BMI stands for body mass index, which serves as a guideline to whether you have too much or too little body fat around the waist. ECG stands for electrocardiogram. ECG records impulses to show how fast the heart is beating and whether they are irregular or regular beats. With this quiz, your understanding of BMI and ECG will not skip a beat.

Questions and Answers

1.

The space in the middle of the thoracic cavity where the heart resides is the...
- A.
  
  Pericardial cavity
- B.
  
  Pericardium
- C.
  
  Mediastinum
- D.
  
  Dorsal cavity
2.

If communication between the SA node and the AV node becomes blocked, which is most certainly affected:
- A.
  
  The ventricles will contract at a slower rate
- B.
  
  the atria will contract at a slower rate
- C.
  
  Stroke volume will increase
- D.
  
  All of the above
3.

If there is a blockage between the AV node and AV bundle, how will this affect the appearance of the ECG:
- A.
  
  QRS interval would be longer
- B.
  
  There would be more P waves than QRS complexes
- C.
  
  There would be more QRS complexes than P waves
- D.
  
  The T wave would not be present
4.

A valve damaged by rheumatic fever fails to open completely. This is called:
- A.
  
  stenosis
- B.
  
  Heart block
- C.
  
  MI
- D.
  
  Fibrillation
5.

Blood returning from the lungs enters the heart through the:
- A.
  
  Mitral valve
- B.
  
  right ventricle
- C.
  
  Left atrium
- D.
  
  Vena cava
6.

The T wave on an ECG represents:
- A.
  
  Ventricular depolarization
- B.
  
  Ventricular repolarization
- C.
  
  Atrial depolarization
- D.
  
  Atrial repolarization
7.

During ventricular systole:
- A.
  
  the atria are contracting
- B.
  
  The AV valves are closed
- C.
  
  The pressure inside the ventricles is less than in the atria
- D.
  
  Blood is ejected into the atria
8.

The blood vessels that play the most important role in the regulation of blood flow to a tissue and blood pressure are the:
- A.
  
  arterioles
- B.
  
  Capillaries
- C.
  
  Arteries
- D.
  
  Veins
9.

The smallest contractile unit of skeletal muscle is a:
- A.
  
  Sarcomere
- B.
  
  Motor unit
- C.
  
  Synapse
- D.
  
  thin filament
10.

Which of the following actions is caused by skeletal muscle:
- A.
  
  Constriction of blood vessels
- B.
  
  Heartbeat
- C.
  
  Dilation of pupil
- D.
  
  Eye movements
11.

Curare, a toxin, blocks the acetylcholine receptors on muscle tissue. This would result in:
- A.
  
  Increased stimulation of the muscle fiber
- B.
  
  inability of the muscle to respond to motor nerve stimulus
- C.
  
  Contraction of the muscle fiber
- D.
  
  Excessive contractions and convulsions
12.

In electrical terms, "potential" is synonymous with:
- A.
  
  Voltage
- B.
  
  Current
- C.
  
  Power
- D.
  
  Emf
13.

The typical neuronal resting membrane potential measures approximately:
- A.
  
  -1000mV
- B.
  
  -20mV
- C.
  
  -70mV
- D.
  
  +20mv
14.

There is a greater concentration of... ions accumulating on the outer surface of resting neuronal membranes than on the inner surface.
- A.
  
  Calcium
- B.
  
  Sodium
- C.
  
  Potassium
- D.
  
  Chloride
15.

The Na/K pump operates by transporting three _____ ions out of the cell while transporting two _____ ions into the cell.
- A.
  
  Sodium, potassium
- B.
  
  Potassium, sodium
- C.
  
  Sodium, calcium
- D.
  
  Calcium, potassium
16.

The influx of Na+ causes _______ of the membrane, which is the first phase of the action potential.
- A.
  
  Repolarization
- B.
  
  Depolarization
- C.
  
  Repolarization