What is the average blood pressure in veins?
a) 2mm Hg
b) 100mm Hg
c) 20mm Hg
d) 200mm Hg
Which of the following blood vessels have valves to prevent backflow of the blood?
a) lacteals
b) arteries
c) veins
d) capillaries
Adjustment of
blood flow in capillaries is carried out by…….
a) pre-capillary sphincters
b) valves
c) maximum exchange of material
d) its small diameter
Human and other mammals have…….circuit circulatory system.
a) two
b) three
c) four
d) five
Explanation: pulmonary circulation and systemic circulation
Which of the following have single circuit heart?
a) fish
b) mammals
c) reptiles
d) birds
Which of the following is/are true for veins?
a) contain valves
b) cannot bear systolic pressure
c) less elastic
d) all of these
