22-23 RESPIRATORY BASICS EXAM Qs

Question 1

where is airway resistance highest in the respiratory tract

Answer 1

medium sized-bronchioles

Question 2

what is tidal volume at rest?

Answer 2

500ml

Question 3

what 3 factors reduce the ability of haemoglobin to unload oxygen at the tissues?

Answer 3

• alkalosis
• carbon monoxide poisoning
• fetal haemoglobin

Question 4

what is the means by which carbon dioxide is carried body, ranked from lowest to highest percentage

Answer 4

1st: Carboxyhaemoglobin (0%)
2nd: Dissolved in plasma (10%)
3rd: CarbaminoHb (13%)
4th Bicarbonate (78%)

Question 5

what is the approximate percentage of oxygen in expired air at a resting level of metabolism

Answer 5

15%

Question 6

what is the percentage of binding spaces on haemoglobin occupied by oxygen in the aorta

Answer 6

• oxygen saturation in arterial blood

Question 7

what forms the apex of the heart?

Answer 7

the left ventricle ONLY

Question 8

what are the surface markings of the right border of the heart

Answer 8

3rd right costal cartliage to the 6th right costal cartilage

Question 9

waht is the ligamentum arteriosum?

Answer 9

a remnant of the ductus arteriosus