40. Circulatory System

Which parts of a diver's body are most affected by pressure changes during a dive?

Which gas primarily enters the leaf during the process of photosynthesis?

Oxygen and carbon dioxide pass across the alveolar membrane in the lungs through a process called:

What is the primary function of the respiratory system?

In plants, gas exchange occurs through small openings on the leaves called _______.

What would most likely happen if the body allowed us to exhale all of the air out of our lungs during normal breathing?

Which waste gas is primarily removed from the blood during expiration in humans?

Why do lungs have small external openings rather than large ones, even though larger openings could allow more air to enter?

The tissue through which gases are exchanged between the blood and the air in the lungs is:

How do single-celled organisms typically obtain oxygen for cellular respiration?

Which best describes what happens during exhalation?

What is the main function of the respiratory system?

How do gases enter and exit the leaves of plants during gas exchange?

Which structure in plants serves as an opening for the exchange of gases and water?

How does myoglobin aid diving mammals such as the Weddell seal?