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Flashcards in Diagnostics Deck (13)
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1

What would happen to resistance to flow if vessel diameter is decreased half its original value?

Resistance will increase 16-fold.

2

Closure of the semilunar valves happen in what phase of the cardiac cycle?

Isovolumetric relaxation

*Isovolumetric contraction: Closure AV valves
*Rapid ventricular ejection: opening SL valves
*Rapid ventricular filling: opening AV valves

3

Closure of the atriventricular valves happen in what phase of the cardiac cycle?

Isovolumetric contraction

*Isovolumetric relaxation: Closure SL valves
*Rapid ventricular ejection: opening SL valves
*Rapid ventricular filling: opening AV valves

4

In hypotensive patients with intact baroreceptor reflex, the following events takes place, except:
a. Firing rate of Hering nerve will decrease
b. Sympathetic activation predominate
c. HR will increase
d. SVR will increase
e. NOTA

e. NOTA

*Hering nerve is part of CN IX, so it is basically a parasympathetic nerve. In hypotension, sympathetic nerve should predominate, firing rate should decrease.

5

A patient has CO of 3.2L/min, with an EF of 55% and a HR of 100bpm. What is the EDV?
a. 52.80 mL
b. 58.18 mL
c. 60.08 mL
d. 72.80 mL
e. 88.34 mL

EDV= 58.18 mL

EF= 0.55 or SV/EDV
SV= 0.55 x EDV

CO= SV x HR
3.2= (0.55 x EDV) x 100
EDV= (3.2/0.55) x 1000
EDV= 58.18 mL

6

Respiratory control center responsible for the basic rhythm of respiration.

Dorsal respiratory group (DRG)

* VRG: located in medulla; for active respiration
* DRG: located in medulla; for basic rhythm, inspiration
* Apneustic center: located in lower pons; prolong respiration, decreases RR
* Pneumotaxic center: located in upper pons; shortens inspiration, increases RR

7

Substance leads to vasodilation of renal vessels, except:
a. prostaglandins
b. angiotensin II
c. low dose dopamine
d. prostacyclin
e. bradykinin

b. Angiotensin II

*causes vasoconstriction of renal vessels

8

The following conditions decrease distal tubular K+ secretion, except:
a. low K+ diet
b. Spirinolactone
c. acidosis
d. hypoaldosteronism
e. Loop diuretics

e. Loop diuretics

*it increase urine flow rate, therefore, maintains the luminal concentration of K+ in the distal tubule. This results in concentration gradient that favors increase tubular secretion of K+ that leads to hypokalemia.

9

ACe inhibitors and ARB can decrease GFR by what mechanism?

Decrease in glomerular capillary hydrostatic pressue.


* efferent arteriole constriction

10

p50 of Hemoglobin is?

25 mmHg

11

Cholecystokinin leads to a decrease in?

gastric emptying

*thus increase in gastric emptying time--longer time for the food to stay in the stomach

12

A patient who has pituitary tumor compressing on optic chiasma would produce what visual field defect?

Bitemporal hemianopsia

*Optic nerve: unilateral blindness
*Optic tract, Geniculocalcarine tract: Contralateral homonymous hemianopsia
* Meyer's loop: contralateral Superior homonymous quadrantinopsia
* Parietal lobe: Inferior left homonymous quadrantinopsia

13

A patient who has a lesion in Meyer's loop of the temporal lobe on the right side will produce what visual field defect?

Meyer's loop: Left Superior homonymous quadrantinopsia

*Optic nerve: unilateral blindness
*Optic tract, Geniculocalcarine tract: Contralateral homonymous hemianopsia
* Meyer's loop: contralateral Superior homonymous quadrantinopsia
* Parietal lobe: Inferior left homonymous quadrantinopsia
*Optic chiasm: Bitemporal hemianopsia