Question

Arrange the following vessels in the order in which blood would pass through them

1. pulmonary venules
2. pulmonary trunk
3. pulmonary veins
4. alveolar capillaries
5. pulmonary arterioles
6. pulmonary arteries

Answer 1

In the pulmonary circuit, blood flows through the vessels in the following order: pulmonary arteries, pulmonary arterioles, pulmonary capillaries, pulmonary venules, pulmonary veins, and finally the pulmonary trunk.

Step-by-step explanation:

1. pulmonary arteries - Oxygen-poor blood from the body is pumped by the right ventricle into the pulmonary arteries.
2. pulmonary arterioles - The pulmonary arteries branch into arterioles as they reach the lungs, becoming smaller vessels that eventually lead to the capillaries.
3. pulmonary capillaries - These are tiny blood vessels surrounding the alveoli (air sacs) in the lungs.
4. pulmonary venules - After oxygenation in the alveolar capillaries, blood moves into venules, which are smaller veins.
5. pulmonary veins - Venules combine to form pulmonary veins.
6. pulmonary trunk - The pulmonary veins converge to form the pulmonary trunk, which carries oxygenated blood from the lungs back to the heart.

This sequence ensures that blood is oxygenated in the lungs before being pumped to the rest of the body.