Science MCQ

Breakdown of food into smaller molecules in our body is known as

Main organ of respiration in human body is

Circulatory system transports these throughout the body

The bronchi divide further and end in small air sacs called

_______ muscles are found in the walls of the digestive tract, urinary bladder arteries, and other internal organs.

The walls of the heart is made up of

_______ connect bone to muscle.

A newborn baby has ……….. bones.