The human respiratory system is adapted to allow air to pass in and out of the body, and for efficient gas exchange to happen. Exercise and smoking both affect the lungs and circulatory system.
Which two structures does the trachea lead to in the lungs?
What are the tiny air sacs in the lungs called?
When we inhale (breathe in), what happens to the pressure in the thorax?
What happens when we exhale (breathe out)?
Which statement about atmospheric and exhaled air is correct?
What happens during gas exchange in the lungs?
What happens when we inhale (breathe in)?
Which of these is an adaptation for efficient gas exchange in the air sacs (alveoli)?
During exercise, what happens to breathing in humans?
Tobacco smoke contains carbon monoxide. What problem does this cause?