« previous next »

Author Question: What is meant by the term ejection fraction? What will be an ideal ... (Read 79 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?

Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Did you know?

Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.

Did you know?

Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.

Did you know?

Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

Associative Long-Term Potentiation Associative Long-Term Potentiation
Varieties of Long-Term Memory Varieties of Long-Term Memory
Identify the Main Term Identify the Main Term
Cultures Ideal Body Types Cultures Ideal Body Types
Flexible exchange rates are supposed to prevent long-term trade deficits. Flexible exchange rates are supposed to prevent long-term trade deficits.
No payments were made on a $2,598 loan during its three-year term. What was the annually ... No payments were made on a $2,598 loan during its three-year term. What was the annually ...
Video: Aneurysm

For a complete list of videos, visit our video library