« previous next »

Author Question: What is meant by the term ejection fraction? What will be an ideal ... (Read 44 times)

kamilo84

  • Sr. Member
  • ****
  • Posts: 495
on: Jun 25, 2018
What is meant by the term ejection fraction?
 
  What will be an ideal response?

Question 2

In pacing, rate modulation refers to _____.
 
  a. the ability of a pacemaker to recognize and respond to intrinsic electrical activity
  b. the minimum level of electrical current needed to consistently depolarize the myocardium
  c. the ability of a pacemaker to increase the pacing rate in response to physical activity or metabolic demand
  d. a pacing lead with a single electrical pole at the distal tip of the pacing lead through which the stimulating pulse is delivered.


sarah_brady415

  • Sr. Member
  • ****
  • Posts: 328
Reply #1 on: Jun 25, 2018
Answer to Question 1

Ejection fraction is the percentage of blood pumped out of a heart chamber with each contraction. Each ventricle holds about 150 mL when it is full; they normally eject only about half this volume (70 to 80 mL) with each contraction.

Answer to Question 2

C
Rate modulation refers to a pacemaker's ability to adapt its rate to meet the body's needs caused by increased physical activity and then increase or decrease the pacing rate accordingly. A pacemaker's rate modulation capability may also be referred to as rate responsiveness or rate adaptation.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

The Centers for Disease Control and Prevention has released reports detailing the deaths of infants (younger than 1 year of age) who died after being given cold and cough medications. This underscores the importance of educating parents that children younger than 2 years of age should never be given over-the-counter cold and cough medications without consulting their physicians.

Did you know?

The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

Did you know?

Cutaneous mucormycosis is a rare fungal infection that has been fatal in at least 29% of cases, and in as many as 83% of cases, depending on the patient's health prior to infection. It has occurred often after natural disasters such as tornados, and early treatment is essential.

Did you know?

Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

Did you know?

Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

A full-term pregnancy. Image illustrates position of the fetus and the structures associated with pr A full-term pregnancy. Image illustrates position of the fetus and the structures associated with pr
A Coronal Mass Ejection A Coronal Mass Ejection
Levels of Processing Affects Long-Term but not Short-Term Memory Levels of Processing Affects Long-Term but not Short-Term Memory
To help his students understand the term generalized other, Mead used baseball as an illustration. ... To help his students understand the term generalized other, Mead used baseball as an illustration. ...
Long-term Potentiation in the granule cell layer of the rat hippocampal dentate gyrus. (Traces ... Long-term Potentiation in the granule cell layer of the rat hippocampal dentate gyrus. (Traces ...
A very light ideal spring stretches by when it is used to hang a 135-N object. What is the ... A very light ideal spring stretches by when it is used to hang a 135-N object. What is the ...
Video: Mycobacterium tuberculosis: Drug Resistance and Natural Selection

For a complete list of videos, visit our video library