- 1(current)
Q. No.Figure shows a schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function/s.
| 1. | B-Pulmonary artery- takes blood from heart to lungs, PO2 = 90mm Hg |
| 2. | C-Vena Cava- takes blood from body parts to right auricle, PCO2 = 45mm Hg |
| 3. | D-Dorsal aorta- takes blood from heart to body parts, PO2 = 95mm Hg |
| 4. | A- Pulmonary vein - takes impure blood from body parts, PO2 = 60mm Hg |
| 1. | B - Capillary - thin without muscle layers and well two-cell thick |
| 2. | C - Vein - thin-walled and blood flows in jerks./spurts |
| 3. | D - Pulmonary vein - takes oxygenated blood to heart PO2=95 mm Hg |
| 4. | A - Artery- thick-walled and blood flows evenly |
| 1. | carry blood away from the heart to different organs |
| 2. | break up into capillaries which reunite to form a vein |
| 3. | carry blood from one visceral organ to another visceral organ |
| 4. | supply oxygenated blood to the different organs |
Fastest distribution of some injectible material / medicine and with no risk of any kind can be achieved by injecting it into the:
1. arteries
2. veins
3. lymph vessels
4. muscles
Given below are four statements (a-d) regarding human blood circulatory system:
| (a) | Arteries are thick-walled and have narrow lumen as compared to veins |
| (b) | Angina is acute chest pain when the blood circulation to the brain is reduced |
| (c) | Persons with blood group AB can donate blood to any person with any blood group under ABO system |
| (d) | Calcium ions play a very important role in blood clotting |
Which two of the above statements are correct?
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (d)
In humans, blood passes from the post caval to the diastolic right atrium of heart due to:
1. pushing open of the venous valves
2. suction pull
3. stimulation of the sino auricular node
4. pressure difference between the caval and atrium
- 1(current)
Q. No.
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