MDCAT Biology MCQs

Hemoglobin binds oxygen in red blood cells.
It also contributes to carbon-dioxide transport and buffering.

Peristalsis propels food through the digestive tract.
It occurs in several hollow organs.

Hemoglobin binds oxygen in red blood cells.
It also contributes to carbon-dioxide transport and buffering.

Peristalsis propels food through the digestive tract.
It occurs in several hollow organs.

Peristalsis propels food through the digestive tract.
It occurs in several hollow organs.

The respiratory system brings air to gas-exchange surfaces.
Oxygen enters blood and carbon dioxide leaves.

The respiratory system brings air to gas-exchange surfaces.
Oxygen enters blood and carbon dioxide leaves.

The respiratory system brings air to gas-exchange surfaces.
Oxygen enters blood and carbon dioxide leaves.

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

The liver produces bile continuously.
The gallbladder stores and concentrates it.

Bile salts disperse large fat globules into small droplets.
This increases surface area for lipase.

Digestion converts large food molecules into absorbable units.
The small intestine absorbs most nutrients.