Everyday Science MCQs

White blood cells identify and attack pathogens.
Different types act through phagocytosis or immune responses.

Lipase hydrolyzes fats into fatty acids and glycerol.
It acts mainly in the small intestine.

The eye focuses light onto the retina.
Photoreceptors convert it into nerve signals.

Platelets gather at damaged vessels and activate clotting.
This limits blood loss.

Beta cells in the pancreas produce insulin.
The hormone helps lower blood glucose.

Plasma carries cells, nutrients, hormones, wastes, and proteins.
It is mostly water.

Insulin promotes glucose uptake and storage.
Deficiency or resistance can lead to diabetes mellitus.

The lungs exchange oxygen and carbon dioxide with the blood.
They contain millions of alveoli.

Kidneys remove metabolic wastes and regulate water and salts.
The resulting fluid becomes urine.

Alveoli have thin walls and rich capillary networks.
Their large surface area supports rapid diffusion.

Each nephron filters blood and modifies the filtrate.
Millions of nephrons work together in the kidneys.

The diaphragm contracts and flattens during inhalation.
Relaxation helps reduce chest volume during exhalation.