What percentage of ventricular filling is achieved by atrial contraction?

1. 30

2. 50

3. 70

4. 90

The right atria of the human heart receive:
1. Oxygenated blood
2. Deoxygenated blood
3. Arterial blood
4. Venous blood

The hepatic portal vein drains blood to liver from 
1. heart

2. stomach
3. kidneys

4. intestine

Blood pressure in the pulmonary artery is

(1) more than that in the carotid

(2) more than that in the pulmonary vein

(3) less than that in the venae cavae

(4) same as that in the aorta

Arteries are best defined as the vessels which 

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

Which one of the following has an open circulatory system?

1. Pheretima

2. Periplaneta

3. Hirudinaria

4. Octopus

All veins carry deoxygenated blood except

1. pulmonary vein             

2. hepatic vein

3. hepatic portal vein         

4. renal vein

The given figure shows schematic plan of blood circulation in humans with labels A to D. Identify the labels along with their functions and select the correct option.

1. C - Vena Cava - takes blood from body parts to right atrium, P_CO2 = 45 mm Hg

2. D - Dorsal aorta - takes blood from heart to body parts, P_O2 = 95 mm Hg

3. A - Pulmonary vein - takes impure blood from body parts to heart, P_O2 = 60 mm Hg

4. B - Pulmonary artery - takes blood from heart to lungs, P_O2 = 90 mm Hg.

Which of the following matches correctly?

In open circulatory system, blood is pumped through

1. Sinuses to large vessels

2. Large vessels to sinuses

3. Cavities to organs

4. Spaces to large vessels