Question

How does the blood circulate between lungs and heart in human beings? Give two functions of lymph in human body.

Answer 1

By means of pulmonary artery and pulmonary veins, oxygenated and deoxygenated blood is circulated between the lungs and the heart in human beings.

Lymph actually acts as middle men that transports the food, oxygen and hormones to the body cells and brings the deoxygenated blood and other metabolic wastes and transmits it into the venous system.

Answer 2

Explanation:

Blood enters through two large veins, the inferior and superior venacava emptying oxygen- poor blood from the body into the right atrium. As the ventricle contracts blood leaves through the pulmonic valve , into the pulmonary artery and to the lungs, where it is oxygenated.

Functions of lymph:

It carry carbon dioxide.

It carries food , oxygen and hormones.