Science MCQs

The pharynx is a muscular tube behind the nose that serves as a passageway for both air to the trachea and food to the esophagus.

The larynx, or voice box, houses the vocal cords and is involved in sound production.

Exhalation (or expiration) is the process of expelling air from the lungs.

Veins carry deoxygenated blood, which is rich in carbon dioxide, a waste product of respiration.

White Blood Cells (leukocytes) are part of the immune system and defend the body against pathogens.

Arterioles are small-diameter blood vessels that extend from arteries and lead to capillaries.

The left ventricle has the thickest wall and pumps oxygenated blood into the aorta for distribution to the entire body.

Hemoglobin, an iron-containing protein in red blood cells, binds oxygen and gives blood its red color.

Serum is plasma without fibrinogen and other clotting factors.

Pneumonia causes the alveoli to fill with fluid or pus, making breathing difficult and painful.