Which one of the following is synthesised in human body that dilates blood vessels and increases blood flow?

Which one of the following is not a part of the male reproductive system in human beings?

Which of the following carries oxygenated blood?

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.

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

What percentage of alcohol in human blood causes death?