intro to physio practicals

Question 1

moving from a supine to standing position, gravity causes blood to pool in the legs, increasing/decreasing venous return, stroke vol and CO and MAP

Answer 1

decreasing

Question 2

moving from a supine to standing position, increased/decreased baroreceptor firing, increased/decreased sympathetic output, so TPR and HR increases, MAP increased.

Answer 2

decreased baroreceptor firing, increased sympathetic output

Question 3

without the baroreceptor reflex, …. would cause dizziness or fainting

Answer 3

orthostatic hypotension

Question 4

what happens to MAP during exercise

Answer 4

doesn’t change much

Question 5

using sphygmomanometer - how to calculate MAP

Answer 5

diastolic BP + (pulse pressure/3)

Question 6

HR from ECG (bpm)

Answer 6

60/R-R interval (in secs)

Question 7

main determinant of breathing =

Answer 7

arterial CO2

Question 8

…… detect changes in PCO2 in arterial blood

Answer 8

central chemoreceptors

Question 9

when PCO2 increases, ventilation -

Answer 9

increases

Question 10

hyperventilation - CO2 expired faster than it is produced, so PCO2 decreases, and ventilation -

Answer 10

decreases

Question 11

how to work out minute ventilation (vol breathed every min)

Answer 11

breathing rate x tidal vol

Question 12

obstructive lung disease - high/low FER

Answer 12

low FER

Question 13

restrictive lung disease - high/low FER

Answer 13

high FER