Question: QUESTION 21 Which Of The Following Values For Mean Electrical Axis Might Indicate Systemic Hypertension? A. -90 B. -30 C. 30 D. 60 QUESTION 22 A Pacemaker Fiber Has How Many Phases? A. 1 B. 2 C. 3 D. 4 QUESTION 23 Phase 0 Of A Pacemaker Fiber Involves Which Of The Following Currents ? A. Is B. Ik C. Ib D. None Of The Above QUESTION 24 The Slope Of Phase …

QUESTION 21

1. Which of the following values for mean electrical axis mightindicate systemic hypertension?

   	a.	-90
   	b.	-30
   	c.	30
   	d.	60

  

QUESTION 22

1. A pacemaker fiber has how many phases?

   	a.	1
   	b.	2
   	c.	3
   	d.	4

QUESTION 23

1. Phase 0 of a pacemaker fiber involves which of the followingcurrents ?

   	a.	Is
   	b.	Ik
   	c.	Ib
   	d.	none of the above

QUESTION 24

1. The slope of phase 4 is _________ by norepinephrine

   	a.	decreased
   	b.	increased
   	c.	decreased then increased
   	d.	increased then decreased

QUESTION 25

1. Acetylcholine

   	a.	increases the slope of phase four
   	b.	decreases the slope of phase four
   	c.	has zero impact on the slope of phase 4
   	d.	none of the above

QUESTION 26

1. Phase 3 of the slow fiber is due to which of the following?

   	a.	sodium leaving the cell
   	b.	sodium entering the cell
   	c.	potassium leaving the cell
   	d.	none of the above

  

QUESTION 27

1. The sodium -potassium ATPase pump plays a role in which of thefollowing?

   	a.	Making the resting membrane potential more positive
   	b.	Making the resting membrane potential more negative
   	c.	making the intracellular sodium levels higher
   	d.	MAking the extracellular potassium levels higher

QUESTION 28

1. The sodium potassium ATPase pump

   	a.	pumps three sodiums out of the cell
   	b.	pump 2 potassiums into the cell
   	c.	contributes to the degree of negativity of the myocardial workercell
   	d.	all of the above

QUESTION 29

1. You need to have as much ATP as possible. Who should youcontact?

   	a.	the cytoplasm /glycolysis
   	b.	the matrix of the mitochondria/Kreb cycle
   	c.	the crista of the mitochondria ( Electron Transport)
   	d.	none ot the above

QUESTION 30

1. The best formula for cardiac output is

   	a.	HR X SV
   	b.	SV X HR
   	c.	Both a or B
   	d.	none of the above