Production of which gas is an indication of respiration?
Oxygen
Carbon dioxide
Nitrogen
Hydrogen
Which gas turns calcium hydroxide solution into white or milky?
The upper chamber of the heart into which the blood flow from the vein is called:
Atria
Capillaries
Pulmonary vein
Arteries
The cell respire anaerobically without oxygen. In this process the glucose is broken down into:
Lactic acid
Sulphuric acid
Nitric acid
Carbonic acid
Blood vessels that bring blood towards the heart are called:
Vein
Who discovered the circulatory system?
Erasistratus
Galen
Michael Servetus
William Harvey
Which blood cell helps blood to clot at the site of wound?
White blood cells
Red blood cells
Plasma
Platelets
The smallest type of blood vessels is called :
What is the name of the blood cell which fight diseases?
Who first described arteries and vein?
