Human Respiratory and Digestive Systems

The video tutorial introduces internal organs, focusing on the stomach and lungs. It explains the stomach's role in digestion, detailing how food is broken down and nutrients are absorbed. The process of respiration is covered, highlighting how lungs facilitate oxygen diffusion into the blood. The video concludes with a prompt to subscribe for more content.

Which of the following is NOT considered an internal organ?

• Heart

• Lungs

• Stomach

• Skin

What is the primary function of the stomach?

• To pump blood

• To digest food

• To filter waste

• To exchange gases

Which organ secretes digestive juices that aid in digestion?

• Heart

• Liver

• Lungs

• Brain

What happens to food that remains undigested in the stomach?

• It is expelled through the mouth

• It is absorbed into the bloodstream

• It is stored in the liver

• It moves to the small intestine

What is the main role of the lungs in the body?

• To filter waste

• To digest food

• To facilitate respiration

• To pump blood

Through which structure does air reach the lungs?

• Esophagus

• Small intestine

• Wind pipe

• Large intestine

What are the tiny air sacs in the lungs called?

• Alveoli

• Bronchi

• Capillaries

• Villi

What gas is exchanged for oxygen in the lungs?

• Methane

• Hydrogen

• Carbon dioxide

• Nitrogen

Why do we sometimes yawn?

• To cool down the brain

• To increase oxygen intake

• To digest food

• To expel carbon dioxide

What happens to unwanted gases in the lungs?

• They are stored in the liver

• They are breathed out

• They are converted into nutrients

• They are absorbed into the bloodstream