Blood group of an individual is determined by

The only vein that carries oxygenated blood is :

Which of the following carries oxygenated blood?

In humans which chamber of the heart receives oxygen-rich blood from the lungs first?

Which of the following statements with reference to 'blood' is/are correct? 1. Blood is composed of plasma and different types of cells. 2. The presence of haemoglobin makes blood appear red.

Hormones are secreted by: