FREE PHYSIOLOGY AND STUDY GAMES ABOUT

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FREE PHYSIOLOGY AND STUDY GAMES ABOUT

UNDERSTANDING EKGS-3 EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -78 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: What is recorded on the EKG strip during the resting period?

Answer:

A baseline or isoelectric line

Question 2: Which characteristic of cardiac cells is automatic and mechanical?

Answer:

Contractility Question 3: Why are both mechanical and electrical cardiac function influenced by electrolyte imbalances?

Answer:

Because myocardial cells are bathed in electrolyte solutions.Question 4: True or False:Atrial muscles contract simultaneously.

Answer:

True

Question 5: What characteristic of cardiac cells form synctium, because they function collectively as a unit?

Answer:

Conductivity

Question 6: Where are the specialized group cells found?

Answer:

In the electrical conduction system of the heart.Question 7: What is the period when repolarization is almost complete & the cardiac cell can be stimulated to contract prematurely if the stimulus to contract prematurely if the stiumulus is much stronger than normal?

Answer:

Relative refractory period

Question 8: What is the extracellular (outside the cell)cation?

Answer:

Sodium (Na) Question 9: An increase in sodium blood levels is known as:

Answer:

Hypernatremia

Question 10: What are myocardial working cells?

Answer:

Myocardial working cells are responsible for generating the physical contraction of the heart muscle.Question 11: Which ions diffuse through the membrane more readily? (Hint: Potassium or Sodium)

Answer:

Potassium Question 12: During most of the process of repolarization, the cardiac cell: (Hint: 2 responses)

Answer:

• Is unable to respond to a new electrical stimulus.2. Cannot spontaneously depolarize

Question 13: During the repolarization period, what two stages does the heart go through?

Answer:

• Absolute refractory period
• Relative refractory period

Question 14: What is an ion with a negative (-) charge?

Answer:

anion (pronounced aneon) Question 15: What is the ability of cardiac cells to shorten and cause cardiac muscle contraction in response to an electrical stimulus?

Answer:

Contractility

Question 16: What are the two myocardial cell groups?

Answer:

Myocardial cell groups:

• The myocardial working cells
• The specialized pacemaker cells of the electrical conduction system

Question 17: What is the fourth cation?

Answer:

4.Magnesium (Mg) Question 18: True or False: A weaker stiumulus can cause a contraction when a cardiac cell is highly irritabile.

Answer:

True Question 19: Cardiac muscle cells have the ability to contract in response to which stimuli?

(Hint: 4)

Answer:

1.Thermal 2.Chemical 3.Electrical 4.Mechanical

Question 20: What is an increase in potassium blood levels?

Answer:

Hyperkalemia Question 21: What is the ability of cardiac cells to receive an electrical stimulus and then transmit it to other cardiac cells?

Answer:

Conductivity

Question 22: What happens when electrolytes are placed in water?

Answer:

Positive or negative charged ions are produced.

Question 23: What are the four primary characteristics of cardiac cells?

Answer:

• Automaticity
• Excitability (irritability)
• Conductivity
• Contractility (rhythmicity)

Question 24: What are the functions of myocardial working cells?

Answer:

• contraction
• relaxation

Question 25: How are the myocardial working cells and specialized pacemaker cells different?

Answer:

The specialized pacemaker cells DO NOT contain contractile filaments & DO NOT have the ability to contract.Question 26: What is the ability of cardiac cells to respond to an electrical stimulus?

Answer:

Excitability (or irritability)